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Show 1831.] MR. A. D. BARTLETT ON HYBRID BOVINE ANIMALS. 399 examined the colliculus seminalis is complete posteriorly and attached to the wall of the urogenital canal for the whole of its length; on either side of this is the crescentic aperture of the vesicula seminalis, which lies to the outside of the small aperture of the vas deferens or unites with it (Propithecus). Hapalemur griseus appears to occupy an intermediate position between Lemur on the one hand and Propithecus on the other, since the aperture of the vas deferens, though distinct from that of the vesicula seminalis, is enclosed within the same area. The structure of the vesiculee seminales in Hapalemur is exactly like that of Lemur catta ; while in Perodicticus, Loris gracilis, and Nycticebus tardigradus the vesiculee seminales are stout, pyriforrn sacs with thick walls raised internally into longitudinal ridges, of which two are especially stout and thick ; these are united by a network of smaller ridges ; the distal end is not bent inwards and partially constricted off as in Hapalemur and Lemur. In all these points Arctocebus appears to resemble Nycticebus &c. The penis of Ilapalemur griseus, as in other Lemurs, is furnished with a bone ; the glans penis is rough and tubercular, being covered with numerous small plates, some of which bear short, recurved spines, which are longer upon the hinder part of the glans ; the anterior end of the glans penis is smooth and grooved upon its lower surface to correspond with the bifid extremity of the os penis ; the urethra opens at the posterior extremity of this groove. Postscript added June 21st.-I am now able to state that the patch of spine-like processes upon the arm is not a sexual character, but is found in both sexes of Ilapalemur griseus, while it is unrepresented in Hapalemur simus; I applied for information on this point to Dr. Jentink and to Prof. A. Milne-Edwards; these gentlemen very kindly examined the large series of examples of the two species preserved in the Museums of Leyden and Paris, and informed me that Hapalemur griseus is distinguished from //. simus by a patch of spines upon the arms, which, however, show certain differences in the two sexes: in the male they are as described above (p. 393/; in the female the spines are replaced by hairs, but tne patch as a whole is quite distinct from the rest of the integument of the arm. Dr. Jentink furthermore directed m y attention to a possibly similar structure (a climbing organ ?) upon the arm of Lemur catta, which has the form of a horny outgrowth somewhat like the spur of a cock. 2. O n some Hybrid Bovine Animals bred in the Society's Gardens. By A. D. B A R T L E T T , Superintendent. [Eeceived June 3, 1884.] (Plates X X X I V . & XXXV.) The subject to which I have the pleasure of calling your attention this evening is the production of some remarkable Bovine animals in the Society's Gardens. 27* |