386 
BULLETIN OF THE UNITED STATES FISH COMMISSION. 
with equal threadlike interspaces covering the shell; the later whorls are white with three pale 
yellow-brown spiral bands, one presutural, one peripheral, and one basal, and wider in that order; 
pillar straight, white. 
Length, 3.5; maximum diameter, 1.5 mm. 
Mayaguez, Porto Rico; station 134. 
This may prove to be a Mangilia, as the aperture is not mature, hut is too elegant a shell to pass 
over on that account. 
Drillia gundlachi, n. sp. Plate 57, fig. 17. 
Shell solid, slender, pale brown or whitish, with ten whorls (the nepionic whorls lost) strongly 
appressedat the suture; anal fasciole. close to the suture, smooth or faintly spirally striated, rather wide 
and excavated, notch wide, not very deep; sculpture of about six strong, short, turgid ribs obsolete in 
front of the periphery and on the last half of the last whorl; these are crossed by from two to five spiral 
threads stronger on the summits of the ribs, especially the pair which first, appear, and faint, finer, 
spiral striations between the ribs; lines of growth well marked; aperture elongate; outer lip moderately 
thickened, inner lip and throat white; canal rather wide. 
Length, 34; maximum diameter, 9 mm. 
Mayaguez Harbor, Porto Rico. 
A strong and elegant species. 
Drillia ponciana, n. sp. Plate 57, fig. 19. 
Shell small, solid, of a warm reddish brown, with the prominences of the sculpture paler, with 
one and a half smooth nepionic and six and a half subsequent sculptured whorls; a narrow, deep anal 
fasciole and reticulated sculpture of subequal axial and spiral threads minutely nodulous at the 
intersections; the spirals on the upper whorls increase from one to three between the sutures, and the 
posterior spiral is at first very marked; aperture as figured; pillar and throat deep reddish brown, 
outer lip heavy; notch short, subcircular. 
Length, 6.5; maximum diameter, 2.5 mm. 
Playa de Ponce, Porto Rico. 
A small, solid, and very elegant shell, belonging in the group to which l>. uigrescens Gray is 
referred, but different from anything in the National collection. 
Drillia melonesiana, n. sp. Plate 57, fig. 20. 
Shell small, solid, strong, spindle-shaped, with one or two smooth nepionic and eight strongly 
sculptured subsequent whorls; type of an ashy brown (possibly in some cases nearly or quite black) 
with the sculptural prominences white; notch short, subcircular, leaving a narrow, strongly excavated 
fasciole separated from the suture behind it by a line of half-moon-shaped nodules, though the fasciole 
is so narrow and deep that at first sight it would be taken for the suture; sculpture essentially as 
figured, with fine interstitial spirals reticulated by the incremental lines; aperture narrow, not lirate, 
pillar and throat brownish. 
Length, 10; maximum diameter, 4 mm. 
Off Point Melones, Porto Rico, at station 144. 
A solid, richly sculptured little shell, of which the brown color may be due to fading, though the 
type is quite fresh-looking. It does not appear to belong to the D. albinodata series, but has more 
sharply cut sculpture. 
Drillia interpleura, n. sp. Plate 57, fig. 21. 
Shell small, solid, strongly sculptured, with two smooth nepionic and six subsequent whorls; 
region of the canal and prominences on the ribs whitish, the rest of the shell yellowish brown with a 
dark reddish brown flammule in the \ alley between each pair of ribs; sculpture essentially as figured, 
libs seven or eight, the outer lip much thickened behind and thin at the outer edge, lirate within; 
pillar and throat yellowish. 
Length, 10; maximum diameter. 4 mm. 
Mayaguez Harbor, Porto Rico. 
This very pretty little species has a general resemblance to several others, but when a close com- 
parison was made seemed to be not identical with any recorded from the region or contained in the 
National Museum. 
