544 



PROCEEDINGS OF THE ACADEMY OF 



[Nov., 



there are two more or less compressed lip-teeth, a lamina or buttress 

 above the upper one, and a well-developed biramose parietal tooth, 

 both rami of which are strongly developed, more or less curved or 

 sinuous, and connect with the ends of the peristome, thereby differing 

 from species of the group of P. ventrosula. This group is very closely 

 related to Floridan forms, such as pustuloides, espiloca, auriformis, etc., 

 differing chiefly by the armature of the outer lip. The following 

 species are included: 



P. oppilata Morel P. aulacomphala Pils. and Hinkl. 



P. o. implicata 'Beck' Marts. P. rhoadsi Pils. 



P. o. complicata Pils. P. polita Pils. and Hinkl. 



P. ariadnce (Pfr.) 



Euglandina cymatophora n. sp. Fig. 3. 



The shell is cylindric-oblong, of a yellowish brown or fallow color, 

 very glossy. The apex is rounded; first 3^ whorls are smooth; the 



following whorls have short, regular folds 

 below the suture, distinct and rather strong 

 near the suture but rapidly becoming very 

 weak, the surface becoming smooth. On the 

 latter part of the last whorl strong, regular 

 folds continue to the base. The distance 

 from crest to crest of these folds is about 

 one millimeter. Besides this sculpture, there 

 are conspicuous places of growth-arrest, 

 marked by an impressed light line, preceded 

 by a darker streak, which follows a rather 

 wide opaque streak. There are three such 

 variceal marks on the last whorl of the type. The spire has 

 nearly straight outlines and a well impressed suture. The 

 whorls increased slowly and regularly to the last, which de- 

 scends more rapidly. The aperture is more than half the length 

 of the shell, its upper half very narrow. The outer lip retracts rather 

 strongly above, and arches forward in the middle. The columella is 

 moderately concave. 



Length 38, diam. 14, length of aperture 22.5 mm.; whorls 9. 

 Side of the canyon below Las Canoas, State of San Luis Potosi. 

 Type No. 98,612 A. N. S. P 



One living and two dead specimens were taken. It is quite distinct 

 from other known species by the sculpture, long spire, etc. 



Streptostyla supracostata n. sp. Fig. 4. 

 The shell is oblong, with the aperture about half the total length, 



Fig. 3. E. cymatophora. 



