1920.] NATURAL SCIENCES OF PHILADELPHIA. 197 



Eutrochatella microdina chryseis (Tristr.). 



Two specimens from Chama measm-e: Alt. 4.2, diam. 3.83 mm., 

 and Alt. 3.55, diam. 3.45 mm., respectively. 



The color is barium yellow or between that and amber yellow. 

 The size is about that given for E. microdina, but the proportions 

 are between microdina, in which the alt. and diam. are 4 mm., and 

 chryseis, alt. 4, diam. 3 mm. Perhaps chryseis may better be ranked 

 as a subspecies of E. ynicrodina. 



In this connection it may be noted that Wagner in his mono- 

 graph places microdina in both Eutrochatella (p. 138) and Helicina 

 (p. 318). The species described at p. 318 is certainly not Morelet's 

 species, which has been figured from author's specimens by Fischer 

 and Crosse. 



E. microdina, of which I have three from Morelet, is covered 

 with excrement when aUve. It is paler than chryseis, with the 

 spire slightly lower, tapering with a wider angle, as Fischer and 

 Crosse have pointed out. 



E. simpsoni Ancey, from Utila Island, Honduras, is closely related, 

 but the whorls project more prominently at the periphery, and the 

 size is smaller. One of the original lot was figured in these Proceed- 

 ings 1903, pi. 49, fig. 4. 



These three forms belonging to the subgenus Pyrgodomus Crosse 

 and Fischer, are now for the first time brought together. 



COCHLIOPA Stimpsoii. 



As this genus has doul^led in number of species since the publi- 

 cation of the "Biologia Centrali-Americana" a catalogue of the 

 species may be of use: 



Cochliopa riograndensis Pils. & Ferr. 



Proc. A. N. S. Phila., 1906, p. 171, pi. 9, figs. 10-13. Nautilus, XXIII, 

 p. 99. 



Rio Grande (Ferriss and Pilsbry) to the Panuco River tributaries 



(Hinkley). 



Cochliopa compacta Pils, 



Nautilus, XXIII, Jan. 1910, p. 99, pi. 9, figs. 4. 5. 

 Choy Riv^er, State of San Luis Potosi (Hinkley). 



Cochliopa picta Pils. 



Nautilus, XXIII, Jan. 1910, p. 100, pi. 9, figs. 1, 2. 



Choy and Ganina Rivers, State of San Luis Potosi (Hinkley). 



