380 
BULLETIN OF THE UNITED STATES FISH COMMISSION. 
Thysanophora portoricensis Pfeiffer. 
Helix portoricensis Pfeiffer, Zeits. fiirMalak., iv, p. 13, 1847. 
Helix portoricensis Tryon, Manual, m, p. 96, pi. xix,figs. 11, 12, 1887. 
Porto Rico (Tryon). 
Thysanophora velutina Lamarck. 
Helix velutina Lamarck, An. sans Vert., vi,pt. 2, 1822, p. 86. 
Helix velutina Tryon, Manual, rn, 1887, p. 100, pi. xxii, figs. 30-32. 
Humacao, Porto Rico (Crosse). 
Thysanophora arecibensis Pfeiffer. 
Helix arecibensis Pfeiffer, Mai. Blatt., hi, p. 44, 1856. 
Helix arecibensis Tryon, Manual, III, p. 58, pi. x, figs. 57-59, 1887. 
Arecibo, Porto Rico (Tryon). 
Subfamily HELICIN./E. 
Genus CEPOLIS Montfort, 1810. 
Section JEANNERETIA Pfeiffer, 1877. 
Cepolis dermatina Shuttleworth. 
Helix dermatina Shuttleworth, Diagn. neue Moll. Berner Mitth. 1854, p. 41. 
Cepolis dermatina Tryon, Manual, v, p. 50, pi. x, fig. 93, 1889. 
Luquillo, on bananas; Quebradillas, Porto Rico (Pilsbry). 
Cepolis squamosa Ferussac. 
Helix squamosa FOrussac, Prodr., 1821', p. 36; Hist. Nat. Moll. Terr., pi. 41, fig. 3. 
Cepolis squamosa Pilsbry, Manual, v, p. 95, pi. lvi, figs. 20-22, 1889. 
San Juan and Luquillo, Porto Rico (Pfeiffer). 
Section PLAGIOPTYCHA, Pfeiffer, 1856. 
Cepolis riisei Pfeiffer. 
Helix riisei Pfeiffer, Mai. Bliitt., in, p. 44, 1856. 
Cepolis riisei Pilsbry, Manual, v, p. 16, pi. xi, figs. 33, 34, 1889. 
Island of Vieques (Crosse) . 
Cepolis diaphana Lamarck. 
Helix diaphana Lamarck, An. sans Vert., vi, pt. 2, p. 85, 1822. 
Cepolis diaphana Pilsbry, Manual, v, p. 22, pl.xi, fig. 8; pi. xix, figs. 51, 52, 1889. 
Porto Rico, many localities; island of Vieques. 
Subfamily CAMiENIN/E. 
Genus PLEURODONTE Fischer de Waldheim, 1808. 
Shell rather large and solid, depressed globose to lenticular, often toothed; periphery rounded 
or keeled; striate or granular, usually dark colored; jaw solid, arcuate. 
Subgenus Pleurodonte s. s. 
Section CARACOLLUS Montfort, 1810. 
Pleurodonte carocolla Linnaeus. Plate 54, fig. 7. 
Helix carocolla Linnseus, Syst. Nat., ed. 10, p. 769, 1758; Chemnitz, Conch. Cab., ix, p. 95, pi. 125, figs. 1090, 1091. 
This species, one of the largest and finest of the genus, is finely ribbed below and slightly 
granulous on the upper whorls. The sutures are scarcely impressed; it is always sharply keeled and 
is of a nearly uniform chestnut color throughout, the interior and lip being lighter. 
Height, 25; diameter, 55 mm. 
San Juan; Caguas; El Yunque, Porto Rico. 
