MOLLUSC A OF PORTO RICO. 
379 
Drymaeus liliaceus Ferussac. Plate 53, fig. 10. 
Helix ( Cocldogena ) liliacea Ferussac, Prodr., 1821, p. 54; Hist. Nat. Moll. Terr., pi. 142 B, fig. 11. 
Shell perforate, rather solid, shining, cretaceous or milky white, sometimes stained with bluish; 
whorls six and one-half to seven, scarcely rounded, with very fine, revolving, incised lines, the last 
somewhat swollen at the base; aperture ovate; peristome scarcely expanded, not thickened; columella 
deeply entering, slightly sinuous, reflected and pressed in over the umbilicus. 
Height, 30; diameter, 14; length of aperture, 13 mm. 
Cayey, Porto Rico. Many specimens living, mostly young. 
Drymaeus elongatus Bolten. Plate 53, fig. 5. 
Helix elongata Bolten, Mus. Boltenianam, 1st ed., p. 107, 179$. 
Shell perforate, solid, with delicate growth lines and sometimes with faint traces of revolving 
sculpture, white, salmon-colored, ashy or buff, often with three bands of dark color, which may be 
entire or broken, sometimes longitudinally streaked with brown; whorls six or seven, somewhat 
rounded; aperture ovate; peristome thick, slightly reflexed, advanced in the middle, showing within 
the outside pattern of coloring; columella faintly sinuous, often dark brown. 
Height, 30; diameter, 14; length of aperture, 15 mm. 
Hucares, Porto Rico, brownish and streaked varieties; Culebra Island, white variety. 
Family HELICID^E. 
Subfamily SAGDIN/E. 
Genus THYSANOPHORA Strebel Pfeffer, 1880. 
Thysanophora dioscoricola C. B. Adams. 
Helix dioscoricola C. B. Adams, Proc. Bost. Soc. Nat. Hist., 1845, p. 16. 
Zonites dioscoricola Try on, Manual, n, p. 174, pi. Mil, figs. 46, 47, 1886. 
Island of Vieques; Jamaica; the variety cxca in Florida, Texas, and Trinidad. 
Thysanophora plagioptycha Shuttleworth. 
Helix plagioptycha Shuttleworth, Diagn. neue Moll. Berner Mitth., 1854, p. 37. 
Zonites -plagioptycha Tryon, Manual, ii, p. 174, pi. liii, fig. 51, 1886. 
Humacao; Fajardo; Ceiba; Rio Blanco, Porto Rico; island of Vieques; the variety granum in 
Florida, Mexico, and Yucatan. 
Thysanophora krugiana von Martens. 
Helix ( Microphysa ) krugiana E. von Martens, Jahrb. d. Deutsche Malak Ges., iv, p. 346, pi. xii, fig. 4, 1877. 
Caguana, near Utuado. 
Thysanophora vortex Pfeiffer. 
Helix vortex Pfeiffer, Arch, fur Naturg. , 1 , 1839, p. 351. 
Helix vortex Tryon, Manual, in, p. 98, pi. xix, figs. 25-28, 1887. 
Porto Rico, many localities (Crosse); island of Vieques; St. Thomas; Barbados; St. Croix; Cuba; 
Santo Domingo; Florida. 
Thysanophora subaquila Shuttleworth. 
Helix subaquila Shuttleworth, Diagn. neue Moll. Berner Mitth. 1854, p. 37. 
Helix subaquila Tryon, Manual, in, p. 98, pi. xix, fig. 31, 1887. ' 
Porto Rico generally; Vieques (Crosse); St. Thomas. 
Thysanophora euclasta Shuttleworth. 
Helix euclasta Shuttleworth, Diagn. neue Moll., Berner Mitth., 1854, p. 38. 
Helix euclasta Tryon, Manual, m, p. 97, pi. vm, fig. 65, 1887. 
Ponce, Porto Rico; Vieques; St. Thomas; Cuba. 
Crosse states that only one of the varieties of this species has been found in Porto Rico. 
Thysanophora musicola Shuttleworth. 
Helix musicola Shuttleworth, Diagn. neue Moll. Berner Mitth., 1854, p. 38. 
Helix musicola Tryon, Manual, in, p. 97, pi. vm, fig. 66, 1887. 
Porto Rico, many localities (Crosse). 
