432 
BULLETIN OF THE UNITED STATES FISH COMMISSION. 
rows of tubercles. Purplish flesh color, with scattered brown markings on the rows of nodules; periphery 
whitish, occasionally spotted above. 
Diameter, 40; height, 20 mm. 
San Juan Harbor; May ague/., Porto Rico; Texas. 
Solarium bisulcatum d’Orbigny. 
Solarium bisulcatum d'Orbigny, Moll. Cubana, II, p. 66, pi. xix, figs. 17-20, 1845. 
Shell small, depressed, with a wide umbilicus; spire scarcely elevated, with flat whorls; these 
are sculptured with revolving grooves which are cut by radiating furrows into granules, the rows just 
above and below the suture being strongest; on the periphery there aie two nearly equal rows of 
nodules; the sculpture of the base is much like that above; crenations around the umbilicus moderate; 
aperture nearly round. Color dirt}' white. 
Diameter, 10; height, 2 mm. 
Mayaguez, Porto Rico; several worn shells. 
Section PHILIPPIA Morch. 
Solarium krebsii Morch. 
Solarium Krebsii Morch, Malak. Blatt., 1875, p. 155. 
Quebradillas, Porto Rico (Gundlach). 
Genus TORINIA Gray, 1840. 
Shell varying from planorbiform to turbinately elevated, umbilicus perspective; its margins 
slightly crenate; operculum corneous, generally conically elevated, externally spiral, with projecting 
edges; internal face smooth, with a spirally twisted elevation. 
Torinia cylindrica Gmelin. 
Trochus cylindricus Gmelin, Syst. Nat., p. 3572, 1792. 
Torinia cylindrica Marshall, Tryon’s Man., ix, p. 17, pi. v, fig. 82, 18S7. 
Shell conic, elevated; whorls somewhat rounded, with spiral sulcations, ten-ribbed, the three 
peripheral ribs the strongest; umbilicus deep, scarcely diminishing, its border feebly crenate. Color 
chestnut brown, sparingly mottled with white at the periphery and above the suture. 
Height, 13; diameter, 13 mm. 
Puerto Real; Cabo Rojo light; Guanica, Porto Rico; one specimen in bad condition from each 
locality. 
Torinia aethiops Menke. 
Solarium xthiops Menke, Syn. Moll , ed. n, p. 147, 1830. 
Torinia xthiops Marshall, Tryon’s Mail., IX, p. 18, pi. V, figs. S5, 86, 1887. 
Porto Rico (Gundlach, Menke). 
Genus OMALAXIS Deshayes, 1830. 
Shell discoidal, more or less uncoiled, flat or concave above, the last whorl bicarinated or 
quadrate in section; nucleus sinistral, papillose, depressed; aperture subquadrate, lip sharp. 
Omalaxis exquisita, n. sp. Plate 54, fig. 12. 
Shell minute, with discontinuous whorls in one plane, subquadrate in section, with a minutely 
serrate keel at each angle; whorls three, the nepionic one sinistral and depressed, the others free; 
pellucid whitish, with indications of brown flammuke; whorl four-keeled, the inner keels nearer each 
other than the peripheral pair; shell between the keels polished, smooth; above and below slightly 
convex, but between the peripheral keels somewhat concave. 
Maximum diameter of shell, 3; minimum diameter, 2; height, 1 mm. 
Mayaguez Harbor, Porto Rico, at station 6062, in 25 fathoms, four specimens. 
This is one of the most exquisite little gems of the sea that can be imagined. 
