520 DR. M. WATSON ON THE SPOTTED HYjENA. [May 3, 



length and half an inch in breadth, placed one on either side of 

 the commencement of the urethra. The two lobes are, moreover, 

 inseparably united by an intermediate isthmus, which extends across 

 the upperwall of the urethra. The prostate gland of H. crocuta 

 appears therefore to resemble closely that of H. striata as figured 

 by Leuckart^ but is more flattened from above downwards than 

 in that animal. The absence, or apparent want of differentiation, of 

 the prostate gland from the surrounding tissue in the first specimen 

 which I examined of the male H. crocuta, taken in conjunction 

 with its large size and clear differentiation in both the other speci- 

 mens, each of which was known to be of great age, seems to show 

 that this gland, like the anal scent-glands, only attains its full size 

 at a period somewhat later than that at which the animal attains 

 sexual maturity. 



In addition to the careful investigation of the anatomy of the 

 male and female generative organs, I made a particular examination 

 of the other viscera of both the specimens forwarded to me by the 

 Society. With regard to these, however, I noticed nothing of 

 importance with which to supplement my previous description, 

 beyond some few variations in respect of the number of pulmonic 

 lobes in the different specimens. In the male previously described 

 by Mr. Young and myself \ the lung of the right side was subdivided 

 into six lobes, whilst that of the left was subdivided into three. 

 In the female, the anatomy of which forms a portion of the present 

 communication, I found that the right lung was subdivided into Jive 

 lobes, this being due to the fact that the fissure which separates 

 lobes 1 and 3 of our first specimen did not exist, and that conse- 

 quently these two lobes were fused to form a single one. The left 

 lung of this specimen agreed exactly with the description previously 

 given. In the second male which I examined I found that the anterior 

 vertical fissure (previously described by us) in the left lung had like- 

 wise disappeared, so that the lobes 1 and 2 were almost completely 

 fused. In the right lung of the same specimen there was a mere 

 indication of the fissure which, in the joint paper referred to, 

 separates lobes 1 and 2, whilst the fissure separating lobes 1 and 3 

 had completely disappeared. Consequently the lobes 1, 2, and 3, 

 which in the specimen examined by Mr. Young and myself were 

 perfectly distinct, were fused together and formed a single mass of 

 jiulmonary tissue. In this specimen, therefore, the right lung was 

 subdivided into four lobes only, and not into six (as in the specimen 

 described in our former paper). 



Thus it would appear that the number of lobes into which 

 the lung is divided varies in different specimens of the same species 

 of HycBna, and that consequently no weight can be placed ou the 

 number of pulmonic lobes in any attempt to define the specific 

 characters of the various species of Hycena. 



I am indebted to the kindness of my friend Mr. Alfred Young for 

 the drawings from nature which accompany this paper. 



^ Oyolopfedia of Anatomy, art. Vesicula trostatica 

 ^ P'. Z. S. 1879, p. 87. 



