372 
BULLETIN OF THE UNITED STATES FISH COMMISSION. 
Veronicella occidentalis Guilding. 
Onchidium ocddentale Guilding, Trans. Linn. Soc., xiv, p. 322, pi. xxxi, figs. 8-12, 1825. 
Animal plumbeous or brownish, faintly pustulous, sometimes blackish ; base lighter, often mottled 
with black; foot narrow. Length (in spirit), 45; breadth, 14 mm. 
Anaseo; Caguas; Porto Rico. 
( ORTHURETHRA. ) 
Family PUPID^E. 
Genus BIFIDARIA Sterki, 1891. 
Bifidaria pellucida Pfeiffer. 
Pupa pettucida Pfeiffer, Symb. I, 1841, p. 46. 
Porto Rico, generally; Vieques (Crosse) ; West Indies, generally; Yucatan; Texas. 
Genus PUPOIDES Pfeiffer, 1854. 
Pupoides marginatus Say. 
Cyclosloma marginala Say, Jour. Acad. Phila., II, p. 172, 1821; Am. Journ. Conch., Ill, pi. XV, fig. 11. 
Fajardo, Porto Rico; eastern United States; several of the West Indies. It is almost certain that 
the Bulimus nitidulus of Pfeiffer (Weigm. Arch., i, 1839, p. 352) is this species. Only a brief Latin 
description is given, which, however, agrees well with this species, and Reeve’s description and figure 
in the Conchologia (v, 1849, Bulimus, 588) fit it exactly. 
Genus VERTIGO Muller, 1774. 
Vertigo hexodon C. B. Adams. 
Papa hexodon C. B. Adams, Cont. to Conch., p. 37, 1849. 
Humaeao, Porto Rico (Crosse) ; Jamaica. 
(HETERURETHRA. ) 
Elasmognatha. 
Family SUCCINEIDtE. 
Shell oblique, sometimes flattened, paucispiral, thin, subtransparent, and unicolored. 
Genus SUCCINEA Draparnaud, 1801. 
Shell oval, fragile; spire short; whorls few and rapidly enlarging; aperture oval; outer lip thin, 
not reflected, united below by a broad curve with the thin, smooth columella. 
Section TAPADA Studer, 1830. 
Succinea hyalina Shuttleworth. Plate 54, tig. 15. 
Succinea hyalina Shuttleworth, Diagn. neue Moll. Berner Mitth., 1854, p. 56. 
Shell shining, with rather strong, rude growth lines, short and inflated; whorls scarcely three, 
rapidly increasing; spire short; suture well defined but not deep; aperture large, regularly oval, 
much wider below. Color pale buff, the alcoholic specimen showing iridescent tints. 
Length, 10; diameter, 6.5; length of aperture, 7.5; diameter, 5 mm. 
Caguas, one specimen taken alive. 
Succinea approximans Shuttleworth. 
Succinea aqiproximans Shuttleworth, Diagn. neue Moll. Berner Mitth., 1854, p. 55. 
Porto Rico, common (Crosse) . 
Succinea riisei Pfeiffer. 
Succinea riisei Pfeiffer, Zeits. fur Mai., x, 1853, p. 52. 
Quebradillas, Porto Rico (Crosse) ; Santa Cruz. 
