72 Mr. Gr. A. Boulenger on newly -discovered 



So far as I have yet been able to determine, the develop- 

 ment of the crocodile closely resembles that of the bird. A 

 noticeable feature is the tail, which is of great length at a 

 very early stage, and is at first rolled up in a spiral form, and 

 afterwards, when the embryo is more strongly bent, twisted 

 round the neck. 



That the rudiment of the egg- tooth appears very early has 

 already been mentioned. 



Rudiments of the genital protuberance are already to be 

 seen in embryos which are about 10 millim. long (measured 

 in the bent position) . A rod-shaped structure may then be 

 observed between the posterior legs ; it is about 1 millim. in 

 length and protrudes from the cloaca, with the anterior wall 

 of which it is fused. It at first lies parallel to the median 

 line of the abdomen, is subsequently erected, and finally com- 

 pletely retracted within the opening of the cloaca. It is not 

 until the embryos are almost full-grown, after about two and 

 a half months, that the genital protuberance begins to 

 disappear altogether, and is then only to be seen by separating 

 the lips of the cloaca. 



IX. — On neioly -discovered East- African Chameleons^ with 

 Remarks on some other Rejytiles described by Dr. Stein- 

 daclmer. By G. A. Boulenger. 



Judging from the number of descriptions recently published* 

 it would seem that the Chameleon fauna of East Africa is 

 likely soon to rank next to that of Madagascar with regard 

 to variety of species. I have, however, no doubt that the 

 list of species has to be reduced by three, of which two 

 have just been described by Dr. Steindachner and the third 

 by Mr. Stcjneger. On comparing the descriptions and 

 figures of Chavueleon Hohnelii and leikijnensis with the late 

 J. G. Fischer's account of Ch. bitaniatus and the specimens 

 in the British j\luseum, I cannot come to any other conclusion 

 but that they all belong to one and the same species. Dr. 

 Steindachner's specimens being fully-developed males. The 



* Chamcfleon sphceroplwlis (Victoria Nyanza") ami Fischeri (Usafrara r), 

 Reiclieuow, Zool. Auz. 1887, pp. 370 and •■!71 ; ('//. Jiojuri (Kiliti), 

 Bouleuger, P. Z. S. 1890, p. 85, pi. viii. lig. i ; C/i. llohmlii (^Loikipia, 

 west of Kenia, (jOOO feet), hihipic/isis (Leikipia), and tareteiisiff (Taveta, 

 foot of Kilimaudjai'o), Stoiudachner, Anz. Ak. Wien, 18JI1, pp. 141 and 

 HL^aud Sitzb. C. 1801, pp. 307, 300. 310, pi. i. ; Ch. Abhviti (Kiliuia- 

 ndjaro), Stejueger, Bull. U. S. Nat. Mus. xiv. 1891, p. 353 ; Hhampho- 

 leon livbccchii (Somalilaud), Boulenger, Auu. Mus. Geuova {2) xii. 1801, 

 p. 11, pi. i. fig. 3. 



