MOLLUSCA OF PORTO RICO. 
419 
Sconsia striata Lamarck. 
Cassidaria striata Lamarck, An. sans Vert., vn, p.216,1822. 
Cassidaria striata Reeve, Conch. Icon., v, pi. r, fig'. 2, 1849. 
Shell solid ovate, closely, spirally striate, made somewhat decussate by distinct growth lines; 
suture deep; aperture rather elongated; inner and outer lips strongly plicate, the latter thickened 
within; canal somewhat developed, but slightly reflexed; columellar callus thick, extending well over 
the base. Color whitish, with rows of square brown spots. 
Length, 45; diameter, 25; of aperture and canal, 35 mm. 
Mayaguez Harbor, one very young and one partly grown shell in bad condition. 
The above measurements are taken from a tine, perfectly fresh shell in the National Museum 
collection. 
Genus LAMBIDITJM Link, 1808. 
Shell solid, subconical, covered with revolving rows of strong, warty nodules; spire varying 
from low to moderate; outer lip decidedly thickened, dentate within; canal short, scarcely recurved; 
columellar callus extending over the base of the shell, nodulous. 
Lambidium oniscus Linnaeus. 
Strombus oniscus Linnaeus, Syst. Nat., ed. xn, p. 1210, 1767. 
Oniscia oniscus Reeve, Conch. Icon., v, pi. I, fig. 1, 1849. 
Shell obconic, with low spire, its whorls having a rather sharp shoulder which is sometimes nearly 
smooth, at others sculptured with revolving stria 3 , and often nodulous; on the body whorl are 3 
revolving rows of strong tubercles; outer lip thickened, slightly ascending the spire, swollen within and 
without, toothed, sometimes cut away below; columellar callus strong, finely pustulous. Color whitish, 
variegated with brownish or dark gray, outer lip dotted; aperture white; callus white or purplish. 
Length, 23; diameter, 15; length of aperture, 23; greatest width of aperture, 2.5 mm. 
Hueares; Guanica; Aguadilla; Ponce, Porto Rico; Ensenada Honda, Culebra. 
Family D0L11ILE. 
Genus DOLIUM Lamarck, 1801. 
Shell large, thin, inflated, globular; spire short; whorls spirally sculptured; aperture very large; 
lip toothed and ridged internally; columellar callus reflexed; basal notch oblique, large. 
Bolium perdix Limueus. 
Buccinnm perdix Linnaeus, Syst. Nat., ed. x, p. 734, 1758. 
Dolium perdix Reeve, Conch. Icon., v, pi. vi, fig. 9, 1849. 
Shell somewhat oval, with rather elevated spire, the whorls being rounded; suture deep; surface 
sculptured with narrow revolving grooves, which are generally rather widely spaced and with faint, 
revolving strife; this is sometimes reticulated by the growth lines; outer lip scarcely thickened, basal 
notch shallow, wide; behind the reflexed curved columella there is an umbilicus. Color brownish or 
purple brown, the grooves often whitish and the ridges marked across with lunar white markings. 
Sometimes it is only faintly marked with white spots. 
Length, 160; diameter, 110 mm. 
Arroyo; San Geronimo, Porto Rico, one worn and broken shell from each locality; West Indian 
and Indo-Pacitic regions generally. 
Dolium galea Linnseus. 
Buccinum galea Linnaeus, Syst. Nat., ed. x, p. 734, 1758. 
Dolium galea Reeve, Conch. Icon., v, pi. I, 1848. 
Shell nearly globular, with sharp-pointed spire rising but little above rounded outline; whorls 
rounded, sculptured with distant revolving grooves; suture deep; outer lip a little thickened, crenate on 
its edge, showing the ridges and grooves within; basal notch moderate; there is an umbilicus behind 
columellar reflection. Color whitish or fulvous, spire darker; columellar area with brown stains, 
Length, 200; diameter, 160 mm. 
Mayaguez, one young specimen; West Indies and Mediterranean, 
