62 THE NAUTILUS. 
this is not the case. The umbilical rimation terminates in a tiny 
depression, perhaps perforated, at the axis. The formula of denti- 
cles or folds would be (according to Dr. Sterki’s scheme) AA BDE or 
AABE, The species is of a decidedly different type from any 
other American Pupa. P. californica, hordeacea and other West 
coast forms being quite different. The former is closely allied to 
the group of decora, rowelli, corpulenta; the latter to P. rupicola 
and pellucida. 
Another new Lower California Pupa will be described in the next 
number of THE NAUTILUS. 
PATULA (PTYCHOPATULA) ceca Guppy. 
This species has been noticed and briefly described by Dr. Dall 
in THE Nauriwus for July, 1889, p. 25. The specimens hefore 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 Morelet 
(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 Patula I recently proposed the name 
Ptychopatula. The group includes those minute conoidal Neotropi- 
cal Helices, with acute thin lip, nearly circular or broad-lunate aper- 
ture, thin texture, opaque or nearly so, and generally delicately 
ribbed obliquely. The species are much more narrowly perforated 
than Patula or Microconus. Some of the species have been referred 
by authors to Acanthinula, others to Conulus, Pyramidula (a Eu- 
ropean section), etc. The type is Helix ceca Guppy. The following 
forms group around this type: H. punctwm Morelet, H. dioscori- 
cola ©. B. Ad. (these three probably identical) ; H. ierensis Guppy, 
H. granum Strebel and Pfefter, H. ewcoides 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. ceca has been figured by Binney. 
(Ann. N. Y. Acad. Sei., iii, p. 118, pl. 5, Fig. L, under the name 
“ Helic ———. Costa Rica. Dr. W. M. Gabb.”). It is similar 
to that of Microphysa vortex Pfr. 
