MOLLUSCA OF PORTO RIOO. 
383 
smooth, pale, and inflated, then the more mature whorls following have at first rather strong, even, 
slightly flexuous axial ribs extending from suture to suture; these gradually become fainter and on the 
last whorl obsolete. The only spiral sculpture is a faint groove between the ribs marking the anterior 
border of the rather obscure sutural band; this groove becomes obsolete also on the anterior whorls. 
Pillar short, strong, simple, with no indication of any plait. 
Length of largest specimen, 7.5; maximum diameter, 1.7 mm. 
San Juan Harbor, Porto Rico. 
This is perhaps the smallest species of Terebra yet described from the West Indies and is notable 
for its brilliant vitreous polish and obsolete sculpture. 
Terebra nassula Dali. 
Terebra (Acus?) nassula Dali, Blake Report, ii, p. 66, pi. xxxvi, fig. 8, 1889. 
Shell slender, yellowish white or buff, the color paler at the sutural band; whorls eighteen, the 
nuclear smooth, remainder of the shell uniformly sculptured; in the earlier whorls the band is defined, 
but in the later ones it is faint; longitudinal ribs numerous, curved; spiral threads rather strong, 
forming slight nodules on the ribs, fainter on the base; aperture elongated, canal short, twisted. 
Length, 55; diameter, 10 mm. 
Mayaguez, Porto Rico; Vieques; Culebra. Several specimens were obtained, all young and more 
or less worn. 
Terebra limatula var. acrior Dali. Plate 57, fig. 6. 
Terebra limatula var. acrior Dali, Blake Report, II, p. 66, 1889. 
Four badly broken and worn specimens were obtained at Mayaguez Harbor, Porto Rico. 
Family CONIDdi. 
Genus CORTJS Linnaeus, 1758. 
Shell solid obconic; whorls enrolled upon themselves, the spire short, smooth, or t-uberculate; 
aperture elongated, narrow, the margins parallel; lip simple, but having a slight sutural sinus. 
? Conus delesserti Recluz. 
Conus delesserti Recluz, Mag. de Zool., pi. lxxii, 1843. 
A single badly broken and faded specimen from Boca Prieta, Porto Rico, was obtained, but it 
is not in condition to be identified with certainty. 
Conus agassizii Dali. 
Conus agassizii Dali, Blake Report, I, 1886, pi. ix, figs. 8, 8a, and explanation to plate; ii, p. 68, 1889. 
Shell spindle-shaped, the outline of the last whorl swollen a little at the middle; entire surface 
of this whorl except the extreme upper part grooved, the grooves stronger below; lower ridges 
shouldered; spire high, straight or a little concave; suture distinct, almost channeled; whorls on the 
spire channeled and sculptured with elegant curved riblets; shoulder sharp and dotted with reddish 
brown. There are faint revolving series of brown dots on the body whorl, and a few irregular 
longitudinal brown flames on the spire and body. 
Length of specimen obtained, 27 ; diameter, 14 mm. 
Mayaguez, Porto Rico, one fine young shell. 
Conus pygmasus Reeve. 
Conus pygmseus Reeve, P. Z. S., 1843, p. 179; Kiener, Coq. Vivantes, Conus, p. 174, pi. cn, figs. 1, la, lb, 1848. 
Several specimens from Aguadilla, Porto Rico, may be this, but they are too badly worn to be 
determined with certainty. Reeve’s figure in the Conchologia is utterly worthless. 
Conus verrucosus Hwass. 
Conus verrucosus Hwass, Encyc. M6th., I, pt. ii, p. 708, 1792; Kiener, Coq. Vivantes, Conus, p. 55, pi. lxvi, figs. 6, 6a, 1848. 
Shell elongate-conical, with, a high spire, composed of about ten grooved whorls; suture deep 
and distinct; shoulder sharp; body whorl nearly straight, grooved except at extreme upper part, each 
ridge generally bearing a row of small tubercles. Color whitish, irregularly clouded with brown. 
Length, 27; diameter, 12 mm. 
Mayaguez Harbor, one shell in fair condition. 
