In the tarsier, there are two distinct glands, placed in front of the vesiculw semivales, on the side of the urethra.
The galeopitheci have a single prostate of large size, surrounding the base of the vesiculm.
In the roomette, the prostate is simple, and surrounds a large portion of the circum ference of the urethra, In the dormouse, it surrounds the whole circumference of the urethra, and is composed of a number of lobules.
In the hedgehog, the prostates are four in number, and they belong to the tubular class. The superior prostates are the larger, and are composed of long flexuous tubes, united into lobules, which form lobes, whose tubes re unite to form a single excretory duct, which pierces the superior surface of the urethra. They are attached by processes of the perito meum to the abdominal muscles.— (Hunter.) Two other bundles of smaller size, and of a rounded form, represent the inferior prostates. They are composed of smaller tubes, which separating in the form of a fan, pass towards the circumference of the gland, and terminate in ccecal ends. The excretory ducts open one on either side of the veru montanum. The tubes are composed of membranes of extreme delicacy.
In the mole, the prostate is single, and is formed of membranous tubes folded upon themselves. At the period of heat, it in creases so enormously as to exceed the urinary bladder in size ; it is placed around the urethra in front of the bladder.
The prostate of the bear is confounded with the dilatation of the united vasa deferentia. It surrounds the beginning of the urethra, and forms a bed for the canal of variable thickness, according to the species.
In the otter, weasel, and marten, it consists of a thin layer, without any enlargement. In the ichneumon, there is a gland of consider able size, composed of distinct lobes, situated on the rectal aspect of the urethra ; each lobe has a distinct duct.
In the dog and cat, it forms a large promi nent collar around the urethra; it resembles the human prostate in structure, and mode of termination of its ducts.
In the hyena, it is of large size ; and in the civet it forms two tubercles in front of the in sertion of the vasa deferentia.
In the nzarmott, among the rodentia, it is divided into two lobes, and forms a consider able swelling around the commencement of the urethra.
The glandular covering of the vesiculre seminales, which extends below the muscular structure of the urethra, represents the pros tate gland in the rabbit.
In the squirrel, it is as long as the muscular portion of the urethra, of large size, ovoid in shape, flattened from above, and is divided into two lobes ; it adheres to the urethra by two points, where its excretory ducts pene trate the canal.
According to Muller, in the rat genus, be sides three glands of different structure on each side, the urethra is surrounded by a glandular mass, consisting of bunches of vesi cles, representing the prostate.
In the agonti, the prostates are composed of a trunk, divided into branches and raxnusculi, terminating in vesicular extremities.
In the guinea-pig, the situation of the pros tate is occupied by- a number of tubes folded upon themselves, and connected together by loose cellular membrane.
The elephant has four prostate glands, two on each side, external to the vesiculm semi nales, and near their base ; they are of un equal size, and very small in proportion to the size of the other glands connected with the generative function. They are muscular ex ternally, and are indistinctly lobulated. They form a good illustration of the cellular type of prostates, each consisting of a principal ca vity, into which smaller cavities open. The smaller cells represent so many cul-de-sacs of various sizes, communicating with each other and with the principal cavity ; the excretory duct is of large size, and passes by the side of that of the neighbouring gland, to open sepa rately in the urethra by the side of the veru montanum.
In the wild boar the prostate is divided into lobes, is very compact in its structure, and forms a considerable projection at the begin ning of the urethra. There is also found in this animal a glandular mass, analogous to the prostate, surrounding the muscular portion of the urethra, thickest at the commencement of this canal, and surrounded by muscular fibres coming from the neck of the bladder.