228 



incurved, subcompressed, convex externally, but less convex inter- 

 nally, and ending ahove and in front in a blunt spine ; hand com- 

 pressed, elevated, with the upper edge arched, but not so sharp as in 

 Notopus ; the sides convex and covered ^vith asperities or minutely 

 denticulated ridges, interrupted and transverse ; finger uncinate, very 

 short, incurved ; thumb narrow, compressed, elongated, with a sharp 

 apex and a strong tooth near the distal extremity. 



Feet short and weak, as in Notopus ; the first tibia bicarinated ; 

 the tarsus subquadrate, anteriorly bicarinate, with a scalpel-shaped 

 cla-vv ; the second tibia one-keeled, with the tarsus oblong, and a 

 sharp elongated trigonal claw ; the third tibia subtriangular ; tarsus 

 short, flattened, subtrigonal, with a falcate claw ; fifth tibia trian- 

 gular, very short, flattened ; tarsus transverse-ovate, -vvith a small 

 narrow claw. 



Abdomen of the male seven-jointed, the joints from the first to the 

 sixth nearly of the šame uidth as in Notopus, and the lašt joint tri- 

 gonal. 



Cosmonotus diflfers from Notopus, De Haan, by w'anting the post- 

 frontal, elevated, denticulated ridge ; by the dorsal keel ending ab- 

 ruptly in front, instead of terrainating in a centrai frontai spine ; in 

 the front being notched vvith a single small spine on each side ; in 

 the thorax being much compressed, more especially in front, and in 

 the produced and angular shape, while in Notopus it is almost straight 

 across in front ; and in the sides being entire, with a short sharp 

 spine at the antero-latero angle. 



The cut represents this species of twice the natūrai size, and is 

 named in compliment to J. E. Gray, Esq., F.R.S., Keeper of the 

 Zoological Department in the British Museum. 



December 12, 1847. 

 W. Spence, Esq., F.R.S., in the Chair. 

 The following papers were read : — 

 1. Descriptions of nineteen new species of Helicea, from the 



COLLECTION of H. CuMlNG, EsQ. By Dr. L. PfEIFFER. 



1 . Helix Kurri, Pfr. Hel. testd mediocriter umbilicatd, depressd, 

 tenui, punctis distantibus suh lente scabriusculd , diaphand, corneo- 

 albidd , fascid 1 angustd rvfd, alterd obsoletd infra Įteripheriam 

 ornatd ; spird pland ; anfractibus 4^, primis convexiusculis, ultimo 

 sensim descendente, utrinąue subplano, antice subconstricto ; aper- 

 turd obligud, subtrimigulari-lunari ; peristomate simplice, tenui, 

 marginibus conniventibus, supero late. cxpanso, basali refiexo, colu- 

 mellari brevi, triangulatim dilatato. 



