420 Mr. G. A. Boulenger on 



very distinct marks of growth ; whorls 9^, the upper ones 

 smooth, somewhat flattened, the last three with numerous 

 elevated spiral ledges, rather convex, especially the last ; 

 suture moderately impressed ; aperture piriform, greyish 

 white inside ; columella somewhat bent in. 



Length 32*5, diam. 12 mm. 



Ti/pe locality. Kabaena. 



Specimens examined 23. 



(32) Melanoides crepidinatus ventricosxdus, subsp. n. 



Distinguished from typical il/. crepidinatus by its more 

 slender general form and by its much more convex last 

 whorls ; adult specimens are always decollated. 



Type locality. Mengkoka, S.E. Celebes. 



Specimens examined 2^. 



(33) Melanoides tuherculatus )iudatus, subsp. n. 



A high smooth form of M. tuherculatus, nearly related to 

 M. tuherculatus seminudus, Marts., but easily distinguished 

 from it by its more convex whorls, deeply impressed suture, 

 pointed apex, and by the nearly complete lack of spiral 

 sculpture. 



Length 34, diam. 12 mm. 



Type locality. Segare Anak, Lombok. 



Specimens examined 45. 



LIV. — Descriptions of new Reptiles from the Andes of South 

 America, preserved in the British Museum. By G. A. 

 BOULENGER, F.R.S. 



(Published by permission of the Trustees of the British Museum.) 



Tropidurus holotropis. 



Upper head-scales large, keeled ; a series of four trans- 

 versely enlarged supraoculars, more than half as broad as 

 the supraocular region ; occipital very large, as long as 

 broad ; anterior border of ear scarcely denticulated. A strong 

 transverse gular fold ; side of neck with imbricate keeled 

 scales, directed backwards and upwards. Body moderately 

 depressed ; a vertebral crest, well develoj^ed on the nape, 

 gradually decreasing in height on the body ; dorsal scales 



