¥i2_— .’ MOLLUSCA. 
There is some difficulty in making out this ‘species, Pfeiffer not having figured it ; 
bat his description is clear, and agrees very well with a shell found rather frequently 
at Jalapa by Strebel and Hége, except the dimensions, which are given somewhat 
larger by Pfeiffer. The diameter of the largest specimen found by Strebel is 11-4 millim., 
and many of those collected by Hoge do not exceed 9, but some are: 11 millim. . The 
height given by Pfeiffer cannot be compared directly with ours, because he only 
measures from the apex to near the umbilicus (which is rather vague) in the heliciform 
shells (Monogr. Helic. Vivent. i. p. vi), and not to the base of the aperture, as is done 
in our descriptions; Pfeiffer’s measurements of the height are, therefore, somewhat 
lower than ours. 1 here give the measurements (in millimetres) of the typical form 
and of the var. yalapensis:— 
Diam. maj. 124, min. 104, alt. 5 (?) ; apert. diam. ? , lat. obliqua ? (Pfr.). 
1 . 52 7 42 
a a ne ee 
The thinness, quasi-crenulation of the suture, and the rounded periphery of the J alapa 
shells agree very well with Pfeiffer’s description. The colour is somewhat variable in 
individuals from the same locality, but the darker ones may well be said to be “ rubello- 
cornea.” This species, moreover, is labelled as “ veracruzensis, Pfr.,” in Dunker’s and 
Patel’s collections; and I know no other Mexican shell to which Pfeiffer’s description 
could be reasonably applied. In Albers’s collection there is a shell labelled ‘ H. vera- 
cruzensis, Pfr., ex Cuming,” and to this Strebel alludes on p. 144; it has nearly the 
size given by Pfeiffer (12 millim.), and also the splendour and subcrenulated suture, 
but it is very pale, somewhat more elevated, and its umbilicus is comparatively 
narrower. Nevertheless it may be an individual or local variety of this species. On 
its last whorl it has a peculiar impressed furrow, but this is evidently abnormal and is 
not mentioned by Pfeiffer. This specimen is figured here, Tab. VI. fig. 8. Fischer and 
Crosse’s so-called O. veracruzensis is quite different by its distinct angulation, and I 
propose to separate it under the name of O. sallwana. In O. veracruzensis (Pfr.) the 
apex is often worn and whitish, sometimes to a greater extent than in O. bilineata ; 
and in some specimens there are worn spots, which are more or less in the form of long 
and narrow spiral bands. 
10. Omphalina sallzana, sp. n. 
Zonites (Moreletia) veracruzensis, Fisch. & Crosse, Miss. Scient. Mex , Mollusca, i. p. 159, t. 7. 
 figg. 8, a,b (nec Pfr.) *. 
Hab. E. Mexico: Cordova (Sallé 1). 
_ Differs from Pfeiffer’s species by the distinct angulation of the last whorl, which is 
formally excluded by Pfeiffer’s words “anfr, ult. depresse rotundatus,”? and is not even 
found in very young specimens of O. veracruzensis. This isthe shell figured by Fischer 
and Crosse, and referred by them on p. 160 1, with some doubt, to O. veracruzensis (Pfr.). 
