i114 CONTRIBUTIONS 
Observations. This small species has some resemblance 
to the last described, but differs in size, in the number of 
folds, and in being without a furrow. 
1. striatus. Plate 4. Fig. 100. 
Description. Shell subulate, polished, minutely and 
transversely striate ; substance of the shell rather thin ; 
suture deep and sharp; columella with a single large fold ; 
whorls ———, flattened. 
Length.... Breadth .1, of an inch. 
The smaller figure is of the size of nature. 
Observations. But a fragment of this species has come 
under my observation, and the figure represents it with its 
broken mouth and spire. There is enough of the remains 
to distinguish it from those before described. It most re- 
sembles the last, but differs in being striate, and is appa- 
rently more attenuate in the spire, which I presume is very 
acute. 
A. pygmeus. Plate 4. Fig. 101. 
Description. Shell subulate, smooth, polished ; substance 
of the shell thin ; suture impressed ; spire elevated ; colu- 
mella with a single, rather small fold, whorls six, flattened ; 
mouth ovate ; outer lip simple. 
Length 3-20ths, Breadth 1-20th, of an inch. 
The smaller figure is of the size of nature. 
Observations. This diminutive species resembles most 
