MONOGRAPH OF THE GENUS STROPHIA. 
30 
Peristome sub-continuous, short, connected, (by the frontal bar ) white, 
redexed. Length, 18, diameter 6 2-3 mill. Aperture of the peristome 
o 2-8 mill, long, 4 1-2 wide. Habitat Gibara. 
They also say that the specimens which they had were dead and 
bleached, and probably being worn they did not observe the singular 
transverse lines, whereas the two which I have in my collection, from 
which 1 have made the above description, were evidently living when 
found. 
Gibara is on the northern shore of Eastern Cuba, about thirty-five 
miles west of Point Luerecia Light-house. Although I have seen but 
a single species of this sub-genus, I have no doubt but what others 
will be found in the immediate vicinity. 
SUB-GENUS 10. PINGU1TIA. 
Form of shell, short ani> thick, tiie width being at least one 
HALF THE LENGTH. TllE FIRST TWO OR THREE WHIRLS ARE ABOUT 
EQUAL IN DIAMETER, WITH THE OTHERS ABRUPTLY SMALLER. TEETH, 
NOT PROMINENT. MARGIN, NOT BEVELED. 
The most remarkable feature of this sub-genus is the short, thick 
form of the shell with its abrupt termination at apex, forming the 
widest angle of any known Strophia, over eighty degrees. There is 
but one known species. 
7 ! STROPHIA DIMIDIAT1A Pfeiffer, 
Proteim Strophia. 
Plate VI, fig. 6 front, fig. 7, side view of type. 
Pupa dimidiata Pfeiffer, Zeitshr. f. Mai., 1847, page 19. 
DESCRIPTION. 
Sp. Ch. Size, large. Shell thick and heavy. Striations, present 
on upper whirls. Whirls, 10, the upper of which, including margin is 
about as long as all of the rest put together. 
Form of shell a very obtusely pointed cylinder, with the second 
whirl the largest, the first and third being a little smaller; from the lat- 
ter named, the shell slopes abruptly to a very obtuse point, forming an 
angle of eighty two degrees. Striations not numerous, twenty-eight to 
the first whirl, they are confined to the first tw T o whirls being reproduced 
on the others by roughened lines of growth ; they are not prominent, 
narrow, about one half the width of the interspaces, irregular, furrowed, 
somewhat lengthened, and bent to the right at their lower terminations. 
The whirls are slightly bulging, and there is an elevated keel pass 
