64 THE NAUTILUS. 
rather than a distinct genus; but the total lack of a basal notch or 
truncation is a character usually considered of generic importance. 
P. Rovirosai n. sp. (PI. ITI, figs. 8, 9.) 
Shell oblong-conie, very solid, whitish, encircled by numerous nar- 
row smooth spiral lire of a dark brown color, and somewhat 
alternating in size. Spire conical, apical whorl eroded ; whorls 5 
remaining, slightly convex, the last whorl large, regularly convex. 
Aperture a little less than half the length of the shell, ovate, angular 
above; outer lip regularly acute; inner lip strongly calloused. 
Alt. 20, diam. 12 mill. (old specimen.) 
Alt. 163, diam. 9% mill. (young specimen.) 
Two specimens are before me, collected by Prof. Rovirosa at the 
mountains of Poana, State of Tabasco. The older individual (PL. 
III, fig. 8) is considerably worn; the other is perfect but not 
wholly adult, and neither contains the operculum. The species is 
allied, apparently, to the Cuban Melania brevis Orb., but is 
decidedly longer, and the lirse are much stronger. 
EXPLANATION OF PuiateE III. 
Figs. 1, 2, 3, Chrysodomus (Sipho) Stonei Pils. 
Fig. 4, Eucalodium compactum Pils. 
Fig. 5, 6, Pachychilus glaphyrus var. 
Fig. 7, P. glaphyrus var. potamarchus Pils. 
Figs. 8, 9, Potamanax Rovirosai Pils. 
= 
o 
NOTE ON CYPRHA GREEGORI FORD. 
BY EDGAR A. SMITH. 
I sincerely trust that Mr. Ford’ wrongly estimates the critical acu- 
men of modern conchological students. He says that most of them 
would probably have made C. Greegori a species instead of a variety. 
There is no doubt that the new French School of Conchologists 
would agree with Mr. Ford in considering the shell in question spe- 
cifically distinct from C. cruenta, but Iam glad to say that in Eng- 
land (and I hope in America also) the ideas are not so advanced (?). 
Although examples of this shell have been in the National collect- 
ion for more than 50 years, no British author has ever suggested 
that they belonged to a distinct species. 
1 NAUTILUS, Vol. vi, p. 112, Vol. vii, p. 39. 
