128 
MONOGRAPH OF THE GENUS STROPHIA. 
Aperture, large and open, narrowing quite rapidly within, attain- 
ing its minimum size about .15 from the outside edge of the margin. 
Lower tooth, not prominent, and is situated a little to the right of the 
center. It is about .03 high and .10 long. The upper is situated just 
above it, and is represented by a mere elevation, as seen from the out- 
side, but attains some prominence within. 
Margin not produced forward quite as far as the diameter of the 
shell, does not slope backward, but is inclined considerably to the right. 
It is thin and the edge is rolled backward into quite a prominent, though 
blunt edge. The frontal bar is complete, but not prominent. 
Color of shell, externally, chalky white; internally, gradually be’ 
coming yellowish. * 
DIMENSIONS. 
Size of specimen figured, 1.25 by .47. Largest specimen, 1.30 by 
.50; smallest, 1.20 by .45. Longest specimen, 1.30; shortest. 1.25. 
Greatest diameter, .50; smallest, .45. 
OBSERVATIONS. 
The Seaside Strophia is allied to S. incana, from Key West, but 
differs in being heavier, larger, with a more open aperture, and a some- 
what flanging margin; this last named character being possessed by 
many Cuban species. It belongs to a group of smooth, thin-margined, 
short-toothed Strophias, and may be distinguished by these characters 
combined with the open aperture, rather flanging margin, and pure white 
color. 
The shell here figured and described is unquestionably the Pupa 
maritima of Pfeiffer, and was kindly given me by Prof. H. A. Ward, of 
Rochester, who obtained it from Punta de Maya, Matanzas, Cuba, and 
this is the locality from which Pfeiffer’s type came. 
DISTRIBUTION AND HABITS. 
Matanzas, Cuba, is the locality from whence all of the undoubted 
shells of this species, that I have seen, came. I have never met with 
it living, thus know nothing of its habits. 
23. STROPHIA OALLII Novo. 
Dali’s Strophia. 
Plate XIII, 23 & 23a, shell. Fig. 32, front, A, transverse section; 
o, upper, terminal portion of channeled tooth; c, frontal bar; e, channeled 
tooth, enlarged. Fig. 33, left side. 
