62 THE NAUTILUS, 



this is not the case. The umbilical riiimtion terminates in a tiny 

 depression, ])erhaps perforated, at the axis. The formula of denti- 

 cles or folds would be (according to Dr. 8terki's scheme) AABDE or 

 AABE. The species is of a decidedly different type from any 

 other American Pupa. P. ealiforniea, hordeacea and other West 

 coast forms being cpnte different. The former is closely allied to 

 the group of decora, roxvelli, corpulenta ; the latter to P. rupicola 

 and pellucida. 



Another new Lower California Piqm ■\vill be described in the next 

 number of The Xautilus. 



PATULA (PTYCHOPATULA) cseca (hippy. 



This species has been noticed and briefly described by Dr. Dall 

 in The Nautilus for July, 1889, p. 25. The specimens before me 

 are from Hidalgo, Texas, collected by Mr. Singley. It is also in 

 the Philadelphia Academy collection from Trinidad and Costa Rica, 

 and Dr. Dall reports it from Florida. The Texas shells are 2 mill, 

 high and about the same diameter. The Helix punctum of Moi^elet 

 (1851) is very close to this species, probably identical ; H. dioscori- 

 cola Ad. (1845) is also very similar, and, if the same, has priority. 



As a section of the genus Pahda I recently proposed the name 

 Ptychopatula. The group includes those minute conoidal Neotropi- 

 cal Helices, with acute thin lij), nearly circular or bi'oad-lunate aper- 

 ture, thin texture, opaque or nearly so, and generally delicately 

 ribbed obliquely. The ^^ecies are much more narrowly perforated 

 than Patula or M'lcroconiis. Some of the species have been referred 

 by authors to Acanthimda, others to Conuliis, Pyramidula (a Eu- 

 ropean section), etc. The type is Helix cceca Guppy. The following 

 forms group around this type : H punctum Morelet, H. dioscori- 

 cola C. B. Ad. (these three probably identical) ; H. ierensis Guppy, 

 H. (fvanmn Strebel and Pfefler, H. ccecoides Tate, H plagioptycha 

 Shutt. (these four very closely allied, the last three perhaps identi- 

 cal). The position of this section is next to Microphysa in the genus 

 Patula. The dentition of H. cceca has been figured by Binney. 

 (Aim. N. Y. Acad. Sci., iii, p. 113, pi. 5, Fig. l, under the name 



" Helix . Costa Rica. Dr. W. M. Gabb."). It is similar 



to that of Microphysa vortex Pfr. 



