LYMN/EIDAE OF NORTH AMERICA. , arene 
SHELL: Thin, oblong-ovate, elongate-ovate or fusiform, much 
compressed; surface sculpture as in columella; color brownish horn; 
whorls 4-4'%, very flat-sided, especially the body whorl, which is very 
long and much-compressed; spire moderately short, acute, narrow; 
aperture elongate-ovate, the sides almost parallel in the center, broadly 
rounded anteriorly and bluntly angled posteriorly; inner lip narrow, 
thin, almost straight, the columellar callus forming a rather thick de- 
posit on the parietal wall; there is a very small umbilical chink; axis 
feebly gyrate. 
Length. Breadth. Aperture length. Breadth. 
8-9 4.50 mae fee nile Poey 
13.00 55 8.00 BUD) Pinar del Rio 
13.00 6.00 8.25 SHB ae ed ': = 
13.00 6.00 8.00 eo Oe: e va ‘a 
Tyres: Location not ascertained. 
Type Locatity: Lagunas del Potrero, Omoa en Guines, Havana 
Province. 
ANIMAL, JAW, RADULA AND GENITALIA: Unknown. 
RANGE: Island of Cuba. A tropical species of the West Indian 
region. 
RECORDS. 
CuspaA: Guines, Havana Province (Arango; Poey).—Pinar del Rio Prov- 
ince (Palmer and Riley). 
GEOLOGICAL RANGE: Unknown. 
Ecotocy: Not recorded. 
Remarks: This Cuban columella was at first thought to be refer- 
able to Von Martens’ championi, but a comparison of specimens in 
the Smithsonian Institution from Pinar del Rio, which have been 
compared with undoubted champion from Central America, reveals 
considerable difference, the Cuban species being narrower, with a more 
elongate aperture, a longer spire, and a perfectly straight columellar 
margin. Von Martens describes his species as with a columella “almost 
vertically ascending.” This feature is not exhibited in his figure (Biol. 
Cent. Amer., pl. 19, fig. 12), nor is it shown in specimens from Nica- 
ragua (plate XXIV, figure 20). The general shape of the Cuban 
shell, which in outline strongly resembles some forms of obrussa and 
which is quite unlike the usual form of columella and its varieties, 
leads the writer to consider it a valid species. 
In 1858 Poey described a shell from Guines, Cuba, which has 
been almost entirely overlooked by modern writers. A study of his 
description indicates a shell of the columella group, and there seems 
to be no question but that the shell herein described is the one named 
by Poey. His original description is as follows: 
