MOLLITPCA OF PORTO RICO. 
389 
Mangilia psila Bush. 
Mangilia psila Bush, Trans. Conn. Acad. Sci., vi, p. 455, pi. xlv, fig. 2, 1885. 
Shell elongated, with about nine whorls, each having six straight ribs which are barely inter- 
rupted by the suture; the ribs have a slight nodule at the middle of the whorl, and sometimes there 
is a single pinched-up, revolving ridge on this part of the shell; growth lines delicate; surface covered 
with very nearly obsolete revolving threads; notch in the outer lip feeble; base slightly attenuated. 
Color whitish; some specimens having a narrow, median, brownish, revolving band. 
Length, 6; diameter, 2 mm. 
Mayaguez, Porto Rico, five broken and worn shells. 
Mangilia biconica C. B. Adams. 
Mangilia biconica C. B. Adams, Contr. to Conch., 1850, p. 65. 
Shell small, biconic, with about six longitudinally ribbed, subangular whorls; ribs nearly straight, 
nine or ten on the last whorl and forming a slight shoulder above, the spaces between the ribs filled 
with fine, spiral sculpture; aperture rather wide above, narrowed below into a short canal. 
Length, 5; diameter, 2.5 mm. 
Seven worn and broken specimens were obtained at Mayaguez, Porto Rico. They are in such 
bad condition that it is impossible to say whether they belong to the typical form, which is banded 
on the periphery and which sometimes has a secondary band below, or to the variety alia, which is 
entirely white. A specimen from San Juan has some indication of brown banding on the last whorl. 
Subgenus Daphnella Hinds, 1844. 
Shell thin, fusiform, body whorl elongated; surface cancellated; lip simple, not varicose. 
Mangilia morra Dali. 
Pleurotoma ( DriMa ) morra Dali, Bull. Mus. Comp. Zool., ix, p. 69, 1881. 
Daphnella morra Dali, Blake Rep., II, p. 105, pi. xii, fig. 1, 1889. 
Shell short, fusiform, having six rounded whorls, with a deep suture; sculpture consisting of 
numerous slightly curved longitudinal riblets and many revolving threads, which cover the entire 
surface with a nearly evenly cancellated pattern; notch in the outer lip deep; base somewhat suddenly 
drawn in from the rather swollen body whorl; canal moderate, nearly straight. Color brown. 
Length, 3; diameter, 1.25 mm. 
A single, somewhat worn specimen was obtained from Mayaguez Harbor, Porto Rico. 
Mangilia elata Dali. Plate 54, fig. 17. 
? Daphnella elata Dali, Blake Report, II, p. 105, 1889. 
Five badly broken, worn shells were received from Mayaguez, which are probably this species. 
Subgenus Glyphostoma Gabb, 1872. 
Shell fusiform; outer lip thickened into a varix, slightly dentate within, the notch deep and 
rounded; surface covered with longitudinal ribs crossed by strong, revolving stripe, and marked besides 
with an exceedingly delicate pattern of decussated sculpture. 
Mangilia aguadillana, n. sp. Plate 57, fig. 22. 
Shell small, slender, solid, nine-whorled, of which the first three are nepionic, smooth and 
polished, the subsequent elegantly axially ribbed, with two to four primary spiral threads and fine 
interstitial spiral striation, essentially as figured. Shell white with a superficial brownish tinge on the 
larger whorls, apex and interior of outer lip of a delicate lilac; outer lip strongly thickened, inner lip 
and aperture smooth or destitute of the denticulations usually found in this genus. 
Length, 14; maximum diameter, 4 mm. A variety minor is exactly similar in sculpture, but of 
a pale-straw color, and is 8.5 mm. long and 3 mm. in maximum diameter. 
Aguadilla, Porto Rico; the variety from Mayaguez Harbor, station 6062. 
If the absence of the oral processes is not due to immaturity, this form would better be referred 
to Clathurella. 
