MOLLUSC A OF PORTO RICO. 
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Genus TRALIA Gray, 1840. 
Shell elongated, with a plait on the columella and two on the body whorl; outer lip thickened, 
not lirate; foot entire, elongated, simple behind. 
Subgenus Thalia s. s. 
Tralia pusilla Ctmelin. Plate 54, tig. 13. 
Valuta pusilla Gmelin, Syst. Nat., p. 3436, 1792. 
Tralia pusilla Dal], Proc. TJ. S. Nat. Mus. 1885, p. 276, pi. xviii. fig. 5. 
Shell a rich, deep chestnut color, varying from oval to somewhat elongate, with a single fold on 
the columella and two on the parietal wall; outer lip thickened, inflected in the middle, where there 
is a single revolving ridge on its inner side. 
Length, 13; diameter, 6.5 mm. 
Ensenada Honda, many specimens. 
Genus PEDIPES Seopoli, 1777. 
Shell imperforate, oval to subglobular, with somewhat rounded spirally lirate whorls; columella 
rather wide and bearing two lamellar teeth; parietal wall with a third elevated, compressed, revolving 
tooth or lamella; outer lip somewhat callous within, generally thickened, often toothed. Foot short, 
rounded before and behind, divided below by a deep sulcus. 
Pedipes mirabilis Miihlfeld. Plate 53, tig. 8. 
Turbo mirabilis Miihlfeld, Mag. Ges. Nat. Freunde, Berlin, vm, p. 8, pi. ii, fig. 13, a, b, 1818. 
Pedipes mirabilis Pfr., Mon. Auric., p. 70. 
Shell small, globular-conic, with about four rounded whorls, which are occasionally slightly 
shouldered; whorls closely, spirally lirate; outer lip sometimes callous and having a low entering 
tooth within, sometimes not at all thickened or toothed. 
Length, 3; diameter, 2 mm. 
Ensenada Honda, Culebra. Many specimens taken alive. 
This species appears to vary in size and in the character of the outer lip, and no doubt includes a 
number of nominal species described from the West Indies and Florida. Specimens in the National 
Museum collection, labeled “Indo Pacific,” are considerably larger than the above, but agree in other 
characteristics. 
Genus BLAUNERIA Shuttleworth, 1854. 
Blauneria heteroclita Montagu. 
Valuta lieteroclita Montagu, Test. Brit., Suppl., p.469, 1808. 
Blauneria heteroclita Dali, Proc. U. S. Nat. Mus. 1885, p. 287, pi. xvii, fig. 6. 
Shell slender, very minute, smooth, translucent, sinistral, with a single strongly marked fold. 
Length, 3 mm. 
Porto Rico; Arango; Cuba; Jamaica; Florida. 
Superfamily LIMNOPHXLA. 
Family UMN^ID^. 
Shell variable, spiral, elevated or discoidal; color uniform. Jaw simple, composed of three 
segments; teeth of the radula in horizontal ranges; marginal teeth serrate. 
Subfamily LIMNAilNAi. 
Genus LIMN7EA Lamarck, 1801. 
liimnaea cubensis Pfeiffer. 
Limntea cubensis Pfeiffer, Weigm. Arch., i, 1839, p. 354. 
Porto Rico, several localities (Crosse); Santo Domingo; Cuba: 
F. C. B. 1900—24 
