In the squirrels and marmots they are large and vesicular, and were mistaken for vesiculm seminales. The fluid which they contain is semi-transparent, or of a bluish, opaline ap pearance, of the consistence of starch, and it is poured into the bulbous portion of the urethra by a single orifice. They are com pletely surrounded by a muscular or musculo membranous envelope.
In the ape tribe they are proportionally much larger than in man. In the mantis they are remarkable in size. Their excretory ducts run close together prior to their termination.
In the bat, amongst the Cheiroptera, they are very large.
In the dismar of Russia they are elongated, and bent in the form of the knee.
In the hedgehog they are broad and round composed of a number of straight, short tubes, lying parallel, and dividing into a num ber of exceedingly small ramuscules. The tubes unite into a single canal, which opens into the pelvic portion of the urethra.
In the civet and cat they are large, and enveloped in a thick muscular layer ; but, amongst the Carnivore, they are largest in the hyccna ; the lobes and branches of their secreting tubes are exceedingly distinct and large.
The anti-prostate glands of the ichneu mon form a remarkable swelling at the com mencement of the bulb; they are rounded, and composed of vesicules communicating together ; these unite into a single canal in each gland, which passes beneath the penis, and opens separately into a cul-de-sac, into which the urethra opens. They are sur rounded by an aponeurotic and muscular layer.
There is a similar structure in the marmot; they are shaped like a cl ub,the broad end folded upwards against the handle, which contains the duct ; the mass is divided into a number of glandular cells. The excretory duct opens into a cul-de-sac, hollowed out in the bulb: this con tracts into a narrow canal, which opens into the urethra, near the middle of the penis.
In the rat they are of large size, whitish externally, and pyriform in shape. In the agouti they are broad, rounded, and very vascular.
In the guinea-pig they are more rounded, but of the same structure.
They are spherical, and situated behind the acceleratores arising in the gerboa de Mauritanie, and pyramidal in the gerboa de Schaw. They are broad and rounded in the
elephant; they have a similar structure as the prostate, but are comparatively larger ; they are reddish in colour, very irregular exter nally, and present a lobular appearance. They are divided into two portions ; a smaller, near the bulb, and another large portion. In the centre of the first there is a considerable cavity, which receives the fluid poured into it by smaller cavities, and these communicate with still smaller cellules. From the prin cipal cavity a canal arises, which, communicat ing with that of the other portion of the gland, forms a single common canal. The ex cretory duct is formed of two branches ; it passes a short distance in the walls of the urethra, before it opens into the bulb. The glands are covered by a thick muscular layer, the fibres of which converge to a tendon, which is fixed to each corpus cavernosum.
In the wild boar the gland is elongated and cylindrical, formed of a firm substance com posed of minute cells, which uniting form larger cells, and these communicate with a common central cavity, from which an excre tory duct arises ; this opens on the side of a cul-de-sac in the commencement of the bulb of the urethra. They are each completely surrounded by a muscle. In Solipeds they form an oval swelling on each side of the pelvic portion of the urethra. They are sur rounded by muscular and tendinous fibres : each opens by a dozen orifices, ranged in rows, into the adjacent part of the urethra.
Amongst the Ruminants, in the chamois, they are of the shape and size of a pigeon's egg; its canal terminates in the usual situation. They are similar in all ruminants where they exist.
Amongst the Marsupialia they are remark able for their number : thus, there are as many as six in the Mexican opossum, phalangers, phascolymus, and giant kangaroo ; four in the sarigue and kangaroo-rat. In the giant kan garoo two are placed, one by the side of the other, over the urethra, just behind the crura penis ; two others are situated on each side behind the crura, and are larger than the others. They are all invested by a muscular and aponeurotic envelope, and are composed of canals passing lengthways : they resemble in structure the prostate.