MOLLUSCA OF PORTO RICO. 
401 
Nassarina metabrunnea, n. sp. Plate 57, fig. 16. 
Shell small, solid, acute, whitish, with the apical region brown and also the pillar and canal; suture 
appressed; shell sculptured with numerous axially directed, narrow, close-set ribs, persistent to the 
base, crossed by fine spiral threads with wider interspaces, substantially as figured; nepionic whorls 
three, smooth, polished; sculptured whorls about five and a half; outer lip internally lirate; inner lip 
smooth. 
Length, 6.5; maximum diameter, 2.5 mm. 
Mayaguez Harbor, Porto Rico. 
Much more delicate and different in sculpture from the preceding and the following species. The 
color may vary, but if not it would be well distinguished by its white shell with two brown ends. 
Genus PHOS Montfort, 1810. 
Shell oval-oblong, acuminate, turriculated, cancellated; spire elevated; aperture oval-elongate; 
lip ridged within and having a small sinus below; base sharply notched; columella with one or two 
folds at the base. Operculum claw-shaped, slightly curved, nucleus apical. 
Phos candei d’Orbigny. 
Cancellaria candci d’Orbigny, Moll. Cuba., ii, p. 129, pi. xxi, figs. 23-25, 1845. 
Shell with nine or ten rounded whorls, the first two or two and a half having merely a sharp, 
revolving, central keel; below this it is sculptured with numerous slightly curved, longitudinal ribs 
(about sixteen on the last whorl), which are crossed by revolving threads of three sizes, alternating 
one with the other, and the surface is minutely decussated by fine growth lines; aperture ovate- 
elongate; outer lip thick, with a varix some distance back of its edge, and in some examples there are 
varices scattered over the shell; the liras on the inner side of the outer lip extend in for half a whorl 
or more; notch near the base of the lip well marked, sometimes quite decided, as in 8 'trombus; notch 
at the base deep; columella with two folds at its base, the upper faint; sometimes there are a few 
nodulous plaits above, and there is a plait at the upper part of the parietal wall. Color yellowish 
white to brownish, with darker, faint, broken bands. 
Length, 25; diameter, 12 mm. 
Aguadilla; Mayaguez, Porto Rico. 
A large number of specimens were received, dry and alcoholic, showing a great deal of variation. 
In some specimens there are varices scattered over the shell, marking all the rest periods; in others 
there is only the one varix behind the outer lip. The degree of coarseness of the sculpture varies 
much, and in some shells the color is stronger where the bands cross the ribs. 
Phos parvus C. B. Adams. 
Triton parvus C. B. Adams, Contr. to Conch., 1850, p. 59. 
Phos intricatus Dali, Proc. TJ. S. Nat. Mus., Vi, p. 325, pi. x, fig. 9, 1883. 
Shell rather small, with about eight whorls, which are separated by a deep suture; sculptured 
with eleven strong, distinct, elevated, rounded, longitudinal ribs; these are crossed by sharp, revolving 
riblets, which form nodules on the longitudinal ribs; one of these above the center of the whorls is 
stronger, causing the shell to be shouldered; there aro.fine, revolving threads between the ribs which 
cross the growth lines, making the surface finely reticulate; aperture elongate- ovate; varix just behind 
the outer lip very high and strong; the subbasal notch of the lip feeble; columella scarcely plicate 
below. Color pale brownish, the nodules darker; there is a white band below the middle of the body 
whorl that shows on the bases of the upper whorls. 
Length, 16; diameter, 7 mm. 
Mayaguez Harbor, Porto Rico, one shell. 
Phos oxyglyptus, n. sp. Plate 57, fig. 18. 
Shell small, delicately and sharply sculptured; nepionic whorls three, polished, peripherally 
keeled smooth; subsequent whorls six, sculptured as in P. candei d’Orbigny, with subequal axial 
and spiral ridges and occasional varices; between the primary spirals is usually a minute intercalary 
thread (not shown in the figure) ; aperture lirate on pillar, body and outer lip, the latter with a deep 
sinus, as in Strombus, near its anterior end. 
F. C. B. 1900—26 
