1881.] MR. A.. D. BART LETT ON HYBRID BOVINE ANIMALS. 399 



examined thecolliculus seminalis is complete post?riorly 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) . Ilapalemur griseus appears to occupy an inter- 

 mediate 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 vesiculae seminales in Ilapalemur is exactly 

 like that of Lemur calta ; while in Perodicticus, Loris gracilis, and 

 Nycticebus tardigradus the vesiculae seminales are stout, pyriform 

 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 Ilapalemur and Lemur. In all these 

 points Arctocebus appears to resemble Nycticebus &c. 



The penis of Hapalemur 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 unrepre- 

 sented 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 II. 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 the patch as a whole 

 is quite distinct from the rest of the integument of the arm. 

 Dr. Jentink furthermore directed my attention to a possibly similar 

 structure (a climbing organ?) upon the arm of Lemur catia, which 

 has the form of a horny outgrowth somewhat like the spur of a cock. 



2. On some Hybrid Bovine Animals bred in the Society's 

 Gardens. By A. D. Bartlett, Superintendent. 



[Keceived June 3, 1884.] 



(Plates XXXIV. & 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. 



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