384 
BULLETIN OF THE UNITED STATES FISH COMMISSION. 
Conus mus Hwass. 
Conus mus Hwass, Encyc. M6th., pt. n, p. 630, 1792; Tryon, Manual, YI, p. 19, pi. v, figs. 72, 73, 1884. 
Shell short, with a low, scarcely concave striate spire, which is often tubereulate; body whorl 
covered with low, revolving strife, which become more pronounced at the base; shoulder well defined. 
Color ashy or greenish white, with longitudinal brown clouding, which is broken so as to leave a 
light band on the shoulder and another at the middle of the shell. The whole is covered in a fresh 
state with a thick, dark epidermis. 
Length, 30; diameter, 19 mm. 
San .Tuan; San Geronimo; Aguadilla; Ponce, Porto Rico. 
An abundant species, distributed throughout the West Indies, Mexico and Central America, and 
the Florida Keys. 
Conus nebulosus Solander. 
Conus nebulosus (Solander) Hwass, Eneyc. M6th., n, pt. I, p. 607, 1792; Klener, Coq. Vivantes, Conus, p. 16, pi. xxiv, figs. 2, 
2n, 1848. 
Spire elevated, concave, tubereulate, striate; shoulder well defined; body whorl generally some- 
what granulous, especially at the base, where there may be elevated revolving tuberculated ridges. 
Color brownish, painted with irregular white spots and blotches, often so as to form a lighter central 
band. In some cases the white predominates. 
Length, 35 to 65; diameter, 20 to 35 mm. 
Aguadilla, Porto Rico, three young worn shells. 
A beautiful species, having an almost infinite variety of coloring. 
Conus testudinarius Hwass. 
Conus testudinarius Hwass, Enc. M6th., I, p. 694, 1792. 
Conus porto-ricanus Hwass, op. cit., No. 110, p. 714, Ii, pi. cccxxxvm, fig. 4. 
Porto Rico (Kiener). 
Family PLEUR0T0MID4E. 
Genus PLEUROTOMA Lamarck, 1822. 
Shell turriculated fusiform; spire long, sharp; aperture ovate, columellar margin smooth, the 
outer lip with a narrow sinus situated at or above the peripheral keel; the operculum clawlike. 
Subgenus Pleurotoma s. s. 
Pleurotoma albida Perry. 
Pleurotoma albida Perry, Conch., Expl. pi. xxxn, fig. 4, 1811. 
Shell elongated, with about fourteen or fifteen whorls, the first two nearly smooth, the 
remainder with fine longitudinal threads and strong, revolving ridges, of which there are three on 
each of the spire whorls, the central one the strongest. On the body whorl are many revolving 
ridges which become fainter at the base, and throughout the shell there are fine intermediate 
revolving threads. Sinus rather shallow, wide, placed at second ridge below the suture; canal long, 
rather narrow. Upper whorls brownish tinted, rest of the shell white; epidermis thin, horn colored. 
Length, 100; diameter, 30 mm. 
Boca Prieta; Mayaguez, Porto Rico; a number of young specimens of this fine species. 
Subgenus Ancistrosyrinx Dali, 1881. 
' Whorls concave below the suture, with a wide, deep sinus, bordered externally by an elevated 
frill, which is directed backward. 
Pleurotoma radiata Dali. 
Pleurotoma ( Ancistrosyrinx ) radiata Dali, Blake Report, II, p. 78, pi. xii, fig. 12,1889. 
Shell clouded pale brown and white, or pale uniform brown; nucleus consisting of two whorls, 
the first small, oblique and partly immersed, subsequent whorls nine or ten, at first with a sharp, 
dentate, peripheral keel, which afterwards becomes spinous and posteriorly directed; surface delicately 
