90 DRYM^EUS LEIOSTRACUS. 



Var. subfloccosus, n. v. PI. 24, figs. 26, 27. 



Smaller and more slender ; whorls 6 ; later whorls showing a slight 

 irregular malleation under the lens. Translucent whitish, with more 

 or less opaque white strigation, and often some scattered dots ; sev- 

 eral post-nepionic whorls densely spirally striated. 



Alt. 19, diam. 9, length of aperture 8^ mill. (Nicaragua). 



Alt. 151, diam. 7J, length of aperture 6^ mill. (Honduras). 



Nicaragua (Bridges); Honduras (Hjalmarson). 



D. PANAMENSIS (Broderip). PI. 24, fig. 30. 



Shell ovate-fusiform, somewhat glossy, diaphanous, pale fulvous. 

 Whorls 6, subventricose ; lip slightly subreflexed. 



Alt. 1, diam. inch (Brod.). 



Isla del Rey (San Miguel}, one of the Pearl Islands, and Taboga 

 Island, both in the Bay of Panama, on the trunks of large trees 

 (Cuming). 



Bulinus panamensis BRODERIP, P. Z. S., 1833, p. 105. Sow- 

 ERBY, Conch. Illustr., Bulinus fig. 25. Bulinus panamensis DES- 

 HAYES, in Lamarck, Hist. Nat. des Anim. sans Vert., ed. 2, viii, 

 p. 273. PFR. Monogr. Helic..Vivent. ii, p. 206. REEVE, Conch. 

 Icon, v, Bulimus, pi. 13, fig. 70. Bulimus (Bulimuhis) panamensis 

 BECK, Ind. Moll., p. 67. Bulimus (Leptomerus) panamensis ALBERS, 



Die Helic., ed. I, p. 166 PFR. in Malak. Blatt. ii, p. 160 (1855). 



Orthalicus (Leptomerus^) panamensis H. & A. ADAMS, Gen. Rec. 



Moll, ii, p. 156 Otostomus panamensis MARTENS, Biol. Centr. 



Amer., Moll., p. 236. 



Reeve's figure shows darker obliquely longitudinal tawny streaks 

 on a paler ground. It is probably, as Dr. von Martens remarks, a 

 Drymceus rather than a Leptomerus, and may prove to be a bandless 

 form of one of the preceding species inhabiting the Pearl Islands. 



Subgenus LEIOSTRACUS Albers, 1850. 



Leiostracus ALBERS, Die Heliceen, 1850, p. 156 (exclusive of all 



except Brazilian species) Liostracus VON MARTENS, 2d edition of 



Die He!., p. 213 (same exclusions), type B. vittatus Spix. Not Lios 

 traca Burmeister, Handbuch der Entomologie iii, p. 589, 1842 (Cole- 

 optera); not Leiostraca H. & A. Adams, Gen. Rec. Moll, i, p. 237, 

 Dec., 1853 (Mollusca); not Liostracus Angelin, Palaeont. Suec. ii, 

 1854 (Trilobita). 



Perforate, ovate-pyramidal shells, with the spire somewhat turreted, 



