18S1,] MR. A. D. BARTLETT ON HYBRID BOVINE ANIMALS. 399 



examined the coUiculus 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 th.e small aperture of the vas deferens or unjtes 

 with it (Propithecus) . Sapalemur griseus appears to occupy' an inter- 

 mediate position between Lemur ou the one hand and Propithecus 

 on the other, since the ajjerture 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 Hapalemur is exactly 

 like that of Lemur catta ; while in Perodicficus, Loris gracilis, and 

 Ni/clicebus ta>-(Ugradus the vesiculse 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 LLapiilemur and Lemur. In all these 

 points Arctocebiis 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 bifiil 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 ibund in both sexes oi Hapalemur griseus, while it is unrepre- 

 sented in Hapalemur simus ; I applied for information on this point 

 to Di'. Jentink and to Prof. A. Milne-Edwards; these gentlemen 

 very kindly examined the large series of examples of the two species 

 ])reserved in the Museums of Leyden and Paris, and informed me 

 that Hapalemur griseus is distinguished from H. 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 tiie 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 catta, which 

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



3. On some Hybrid Bovine Animals bred in tlie Society's 

 Gardens. By A. D. Bartlett, Superintendent. 



[Ecceived 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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