436 
BULLETIN OF THE UNITED STATES FISH COMMISSION. 
Truncatella caribeeensis Sowerby. Plate 53, fig. 7. 
Tnincatella caribssensis (Sowerby mss.) Reeve, Conch. Syst., n, pi. clxxxii, fig. 7, 18J2. 
Shell subl imate, subcylindrical, in the adult state, but slightly decreasing in size toward the apex; 
amber colored, with delicate, scarcely curved ribs, which are often faint on the middle of the whorls; 
whorls three and one-half to four, but little rounded, the last with a feeble basal carination; aperture 
subvertical, oval; peristome thickened on its inner lip and pressed in to the last whorl; outer lip 
reflexed. 
Length, 7; diameter, 2.5 to 3 mm. 
Ensenada Honda, Culebra, one specimen; also various West Indian localities; Florida, etc. 
Truncatella subcylindrica Linnaeus. 
Helix subcylindrica Linnaeus, Syst. Nat., ed. xii, p. 1248, 1767: Pulteney, Cat. Dorset, p. 49, 1799; Montagu, Test. Brit., n, p. 
393, 1803 (Ed.Chenu, p. 173); Hanley, Ips. Lin. Conch., p.379, 1855. 
Truncatella subcylindrica Gray, in Turton, Man., p. 295, fig. 72, 1857. 
Tnincatella montagui Lowe, Zool. Journ., v, p. 303, 1831; Thorpe, Brit. Marine Conch., p. 146, fig. 75, 1844. 
Turbo truncatus Montagu, n, p.300, pi. x, fig. 7, 1803; Turton, Conch. Diet., p. 218, 1819. 
Turritella truncata Fleming, Brit. An., p.303, 1828. 
Turbo mbtruntatus Montagu, p. 300, pi. x, fig. 1 (young), 1803: Turton, Conch. Diet., p. 219, 1819. 
Truncatella subcylindrica Pfeiffer, Mon. Auric., p. 186, 1833; Binney, Bost. Journ. Nat. Hist., vn, p. 186 (ex parte), pi. uxv, 
fig. 6 (only), 1859. 
Porto Rico; adventitious in England ; common in Florida and many localities in the West Indies. 1 
Truncatella pulchella Pfeiffer. 
Truncatella pulchella Pfeiffer, Archiv. fiir Naturg., I, 1839, p.356: Binney, Bost. Journ. Nat. Hist., vn, p. 189, pi. L.xxv, figs. 1, 9, 
10, 1859. 
Fajardo, Porto Rico (Crosse) ; other localities in the West Indies; also Florida. 
Truncatella clathrus Lowe. 
Truncatella clathrus Lowe, Zool. Journ., v, p. 303, 1831; Reeve, Conch. Syst., II, pi. 182, fig. 3, 1842; Kiister, Conch. Cab., p. 
15, 1855. 
Rare in Porto Rico (Crosse); St. Thomas; Bermuda (Verrill). 
Family CALYPTR4EID4E. 
Genus CHEILEA Modeer, 1793. 
Shell conical, irregular, lamellated or rayed; the summit subcentral; nucleus subspiral, dextral, 
slightly posterior, within bearing a halt cup-shaped appendage, attached behind the summit and open 
in front; edge of the shell irregular; opercular plate basal, calcareous. 
This is better known by the name of Mitrularia Schumacher. 
Cbeilea equestris Linnaeus. 
Patella eqiieslris Linnaeus, Syst. Nat., ed. x, p. 780, 1758. 
Mitrularia equestris Tryon. Man., "Ill, p. 137, pi. XU, figs. 25-32, 1886. 
Shell irregularly conical, thin or subsolid, pure dead white without and shining white within, 
sculptured with tine radiating threads and strong, very irregular, oblique corrugations or wrinkles, which 
sometimes break up into frills near the base; apex spiral, with one to one and a half whorls, posterior; 
interior process attached along the posterior part of the shell, elongated, so that the points may reach 
below the base of the shell, obliquely truncated. 
Diameter, 40; height, 23 mm. 
Aguadilla; San Juan, Porto Rico; St. Thomas. 
Genus CALYPTRJEA Lamarck, 1799. 
Shell low conical, with central spiral apex; aperture basal, circular, entire; interior having a 
spiral diaphragm, the eolumellar margin of which is twisted, forming a false umbilicus. 
1 The synonymy found in Pfeiffer, Binney, and the usual works of reference contains so many errors that it was 
thought best to expand it more than we have usually attempted in this report. 
