BLADDER, ETC., OF MALE RABBIT. 31 



either side by three packets of tubular glands, two lettered h and z, and a 

 third which, being placed between them and somewhat anteriorly, is not 

 seen clearly in this figure. This last consists of three simple unbranched 

 tubules, which, though said by Weber to be variable in presence, are yet 

 usually to be found in the interval between the lower ends of the two 

 packets, h and z, and open by three distinct orifices into the urethra, as 

 stated by Martin St. Ange, tude sur 1'appareil reproducteur, p. n, who 

 calls them ' accessory prostates.' The larger of the two other packets of 

 glands, h, is readily separable from its fellow of the opposite side, poste- 

 riorly as well as anteriorly ; the smaller, z, interdigitates more or less 

 intimately with its fellow on the posterior surface of this portion of the 

 urethra, but, as in the human subject, the glandular elements of the pro- 

 state do not cross the middle line anteriorly. The characteristic concentri- 

 cally laminated prostatic concretions are found in the tubuli of the smaller 

 packet, though not in the larger ; but it is in accordance with general usage 

 to speak of both of these sets of glands as ' prostates,' the smaller as the 

 ' anterior ' and the larger as the * posterior prostates.' The anterior prostate 

 is divaricable into two lobes, each with a separate duct : the posterior has 

 but a single duct : with, however, the three ducts from the accessory pro- 

 states there are six ducts opening into this portion of the urethra on either 

 side. In the adult Rabbit the vasa deferentia open by an unusual arrange- 

 ment into the literus masculinus about two lines from its orifice ; in the 

 embryo the normal arrangement exists whereby the uterus masculinus 

 opens a little way above these ducts. The testes have been removed in this 

 preparation, together with the greater part of the vasa deferentia, the cut 

 ends of which are seen passing behind the upper angles of the uterus mas- 

 culinus. The portion of the urogenital canal which is laid open at d corre- 

 sponds to the portion known in anthropotomy as the * membranous,' 

 ' muscular,' or ' interfascial ' portion, and as the * isthmus urethrae.' Though 

 longer relatively than in our own species, it has by no means the same 

 relative preponderance which the homologous portion of the canal has in 

 some other Rodents, as e.g. Arctomys, and in some Carnivora, e.g. Canis. 



The wire which has been passed down the urogenital canal from the 

 interior of the bladder projects from the orifice of the urethra, which in 

 these animals, retromingent like other Rodents, has the shape of a vertical 

 backwardly-looking slit. The Cowper's glands, /, organs found in all 

 mammals except, so far as is known, Mustela and Delphinus, with capsules 

 of voluntary muscular fibre and ducts leading into the commencement of 

 the spongy part of the urethra, are seen on either side of the sinus urogeni- 

 talis. On the left side we see at /, in the plane in which this canal passed 

 under the pubic arch, one of the crura penis with the pubo-cavernosus and 

 ischio-cavernosus muscles cut through and detached from that arch, and on 

 the opposite side we see, at k, two ano-preputial glands, one much larger 



