818 ME. G. S. "WEST ON THE BrCCAl GLANDS AND [Nov. 19, 



(PI. XLIV. fig. 23), and the Harderian gland is not visible on 

 removal of the skin, the posterior lobe being small and downwardly 

 directed behind the poison-gland. The maxilla (PL XLIY. fig. 24) 

 possesses 12 much attenuated teeth, which are followed by a solitary 

 larger grooved tooth. There are 17 mandibular teeth. The anterior 

 extremity of the mandible, with the first three teeth, is slightly 

 constricted off from the rest and bent downwards and inwards, 

 but no suture is present. This peculiar condition of the anterior 

 end of the mandible has not been observed in any other Snake. 



Genus Coelopeltis. 



Species examined : — C. lacertina. 



The poison-gland is clearly defined and triangular in form 

 (PL XLV. fig. 1). The Harderian gland (PI. XLV. fig. 4) has but 

 a very small lobe outside the orbit and this is not visible externally. 

 The maxilla (PL XLV. fig. 2) possesses 9 teeth ; the posterior tooth 

 is large, grooved, straighter and less attenuated than usual, the 

 attenuation being confined to the very apex. The first 8 teeth are 

 all of equal size and about one-third as large as the grooved one. 

 There are also 9 mandibular teeth ; the three anterior teeth are 

 very large, but the 6 posterior ones are quite small and separated 

 from them by a marked interspace. 



Grenus Philodetas. 



Species examined : — P. scTiotiii and P. olfersii. 



In P. schoUii the glands of both the upper and lower lips are 

 of comparatively large size, and the poison-gland is superficially 

 indistinguishable from the superior labial (PL XLV. fig. 8). The 

 Harderian gland has an anterior lobe lining the lower half of the 

 orbit, and a posterior elongated lobe just visible externally above 

 the superior labial gland. The maxilla (PL XLV. fig. 9) possesses 

 12 teeth. The two posterior of these are large, grooved, and 

 almost straight, they are not in a line with the others and are 

 separated from them by a wide diastema ; the 10 preceding teeth 

 form a uniform closely-set series. 



The mandibular teeth are 8 in number; there are 4 uniform 

 anterior teeth equal in size to the maxillary, and then a diastema 

 followed by 4 more very small teeth. 



The folds sm-rounding the grooved teeth are only united in 

 front of the bases of the flbi-st tooth, their lower portions being 

 free. 



In P. olfersii the glands are not by any means so extensive 

 (PI. XLV. fig. 6), and the maxilla possesses but 7 teeth, there being 

 6 solid widely separated teeth, followed by a rather large grooved 

 fang (PL XLV. fig. 7). 



Genus Psammodtnastes. 



Species examined : — P. fulverulentus. 



The specimen of this Snake examined was in a damaged condition. 



