102 



aperture orbicular, moderately large : labrum moderately reflected 

 and dilated, very thin. 



Length .2 inch ; breadth .05 inch. 



CvLiNDRELLA PusiLLA. Shell fusiform-cylindric : pale horn color, 

 subtranslucent : with oblique sinuous, rather inequidistant fine elevated 



transverse lines : spire truncate, with the loss of whorls : whorls 



remaining about seven, moderately convex, with a well impressed 

 suture; last whorl smaller than the penult whorl, from which it is 

 not produced, with a sharp spiral keel very near the left side of the 

 aperture : aperture very large, very oblique ; lip extremely narrow, 

 slightly thickened, well reflected. This species belong to the group, 

 of which C. Dunkeri is a type. 



Length .23 inch ; breadth .06 inch. 



Cylindrella pupaeformis. Shell subcylindric : pale horn color, 

 or whitish : with excessively fine regular quite oblique strite ; spire very 



broadly truncate, with the loss of whorls : whorls remaining six 



to six and one-half, slightly convex, with a distinct suture ; last whorl 

 moderately produced from the penult whorl, subangulated anteriorly ; 

 aperture very large, a little angulated by the angle of the last whorl, 

 orbicular : lip narrow, moderately thickened, well reflected. 



Length .40 inch; breadth .13 inch. 



Cylindrella procera. Shell cylindric in the lower three-fifths, 

 moderately tapering above: reddish or yellowish brown : with rather fine 

 regular quite oblique striaj : spire very broadly truncate, with the loss 



of whorls: whorls remaining ten to eleven, moderately convex, 



with a well impressed suture ; last whorl moderately produced, with 

 a very prominent spiral carina anteriorly : aperture not large, sub. 

 orbicular, subiectilinear in the left and upper sides, with a slight 

 sinus between the lower and right sides : lip well reflected, mode- 

 rately thickened and expanded. This is a slender species of the 

 group, of which C. cylindrus Chem. is typical. 



Length L15 inch ; breadth .3 itjch. 



Achatina costulosa. Shell conic, turrited : translucent, very 

 pale brownish horn color, darker at the varices : with the surface ap- 

 parently striated, but having on each whorl about seventy small 

 approximate regular transverse ribs ; but the nuclear whorls are 

 smooth ; with rather indistinct varices, of which there are two or 

 three on each whorl : apex rather obtuse; spire with the outlines 



