12 
MONOGRAPH OF THE GENUS STROPIIIA. 
61 STRQPUIA M ARMOR AT A Pfeiffer. 
Marbled Strophia. 
Plate III, fig. 1, front, fig. 2, side view of a typical specimen. 
Pupa marmorata Pfeiffer, Zeitschr. ., f. Mai. p. S3, 1847. et. Ilelic. 
Viv., Vol. II, 1848, p. 323. 
DESCRIPTION. 
Sp. Ch. Size, medium. Shell rather heavy. Striations present. 
Whirls 9, the upper, of which, with the margin, considerably exceeds 
in length all of the others put together. Examined 40 specimens. 
Form of shell, an obtusely pointed cylinder, with the first and second 
whirls about equal in diameter, the third is a little smaller and from this 
the shell slopes to an obtuse point, forming an angle of about sixty-five 
degrees. 
The striations are numerous, about forty to the first whirl, are not 
prominent, are rounded and slightly widened; they are about as wide- 
ns the interspaces between them, are rather regular, straight and i n- 
clined a little from right to left. The whirls are slightly bulging, but 
the suture between them is shallow. 
Aperature, quite large and widely open not at all contracted within 
and is somewhat higher than wide. The lower tooth is small, about .04 
high, and about twice as long as high. It is inclined to be double, the 
second tooth appearing as a wide mass to the left, but extends backward 
rather farther than the true tooth. The lower tooth is placed a little to 
the right of the centre and well within the mouth, about twice its 
length from the frontal bar. The upper tooth is about as high as* the 
lower, but is thinner and extends back around the column. It is placed 
quite high on the column and somewhat back of the outer termination 
of the lower. 
The margin is not produced forward beyond the diameter of the 
shell, and is inclined backward at the top, and slightly to the right, a 
little beyond the diameter of the shell; it is thin, measuring not over .03 
is reflexed outward about .08, is rolled over a little, and the edge, al- 
though prominent, is not sharpened, but smoothly rounded. The frontal 
bar is quite well developed, but is not produced outward beyond the diam- 
eter of the shell and is slightly inclined; it completely interrupts the 
striations, which do not appear within it. 
Color of shell, externally, white, marked with longitudinal spots 
of a rather pale yellowish brown; these markings being seldom broken 
into horizontal lines by the encroachment of white; internally, pale yel- 
lowish brown, fading into white on the teeth and margin. The mark- 
ings are thicker and rather more regular on the spiral whirls. 
