424 
BULLETIN OF THE UNITED STATES FISH COMMISSION. 
Seila terebralis C. B. Adams. 
Ceriihium terebrale C. B Adams, Bost. Journ. Nat. Hist., hi, p. 320, pi. ill, fig. 7, 1840. 
Shell elongated, sharp-pointed, and regularly increasing, with about fourteen whorls, having four 
regular revolving ridges on the last whorl and three on the others; ridges even in size, the space 
between them sculptured with delicate, longitudinal costae; aperture subquadrate; outer lip showing 
the ridges and furrows within; columella twisted; canal decidedly truncated; base of shell concave. 
Color brownish, lighter on the apex. 
Length, 8; diameter, 2 mm. 
Ensenada Honda., Culebra, two shells. 
Genus CERITHIOPSIS Forbes & Hanley, 1849. 
Shell imperforate, more or less cylindrical, straight, tuberculous, without varices; whorls numer- 
ous; aperture small; canal short, truncated, almost straight; operculum suboval, paucispiral, concave, 
nucleus sublateral. 
Section CERITHIOPSIS s. s. 
Cerithiopsis crystallina Dali. 
Cerithiopsis ? crystallina Dnll, Bull. Mus. Comp. Zool., ix, 1881, p. 89; Blake Report, ir, p.254, pi. xx, fig. 3, 1889. 
Shell elongated, with twenty or more whorls, the tip of the nucleus being lost; there are three 
revolving rows of strong tubercles, that just below the suture being smaller than the other two; the two 
principal rows somewhat widely separated and having sometimes an intermediate, nodulous thread; 
columella slightly twisted; canal scarcely truncate below; base with line, revolving line. Color white. 
Length, 16; diameter, 2.25 mm. 
Aguadilla, Porto Rico, one imperfect shell. 
Cerithiopsis pulchella Jeffreys. 
Cerithiopsis palchella Jeffreys, Ann. and Mag. Nat. Hist., ii, 1858, p. 129, pi. v, fig. 8 n-c. 
Shell with the three nuclear whorls smooth and shining; the subsequent whorls have three 
revolving rows of nodules, of which the central row is most prominent; the last whorl has four rows of 
nodules, of which the two middle row s are stronger; suture jdeep; aperture small, subquadrate; canal 
deeply truncate, short; base below the last row of nodules smooth, concave. Color, pale brownish. 
Length, 3; diameter, 0.75 mm. 
Mayaguez, Porto Rico, one shell. 
Cerithiopsis pupa, n. sp. Plate 53, fig. 16. 
Shell minute pupiform, vitreous, white, with a yellow-brown row of large nodules just behind 
the suture; nepionic whorls missing; subsequent whorls six, with a row of small nodules in front of the 
suture, in front of which is a row of large ones, both white, then the single brown row forming the 
periphery; the base has three strong spirals, the posterior one somewhat nodulous; aperture contracted; 
pillar twisted; canal very short, deep; near the apex there are only two rows of nodules between the 
sutures, and the brown color of the anterior one is feebler. 
Length, 2.5; diameter, 1 mm. 
Mayaguez Harbor, at station 6062, Porto Rico, one specimen. 
This very pretty little shell has much the same coloration as Triforis turns th omx. 
Section ETJMETA Morch. 
Cerithiopsis subulata Montagu. 
Murex subulalus Montagu, Test. Brit., Suppl., p. 115, p). xxx, fig. 6. 1808. 
Shell with about sixteen whorls, with a well-marked suture, below which is a revolving row of 
strong tubercles; on the earlier whorls this row of tubercles is connected by low, longitudinal ribs 
with a larger row of nodules at the base of the whorls; on the lower whorls the longitudinal ribs 
become faint, and there is a revolving, nodulous thread between the two rows of nodules; the last 
whorl has four revolving rows of nodules, and its base is concave, with curved radiating growth lines; 
columella twisted; canal rather long; aperture subquadrate. The upper whorls are purplish; the rest 
of the shell is brownish horn-colored, the upper row of nodules being darker. 
Length, 12; diameter, 3 mm. 
One specimen was dredged off Boca Prieta, Porto Rico. 
