562 MOLLUSCA. 
Tralia infrequens, H. & A. Adams, Gen. Recent Moll. ii. p. 244°. 
Melampus (?) infrequens, Pfeiffer, Monogr. Auric. p. 55°; Catal. Auric. Brit. Mus. p. 40%, 
Hab. S. PANAMA: under stones near high-water mark, at the base of the sea-wall at 
Panama (C. B. Adams '). 
10. Melampus (?) bridgesi. 
Melampus bridgesi, Carpenter, P. Z. S. 1856, p. 161+; Report Moll. W. Coast of N. Am. pp. 284, 
315°. 
? Auriculus avena, Pfeiffer, Monogr. Pneumonopom. iii. p. 361°. 
Hab. S. Panama: “Ad oras sinus Panamensis ” (Bridges !~°). 
PEDIPES. 
Pedipes, Adanson, Voy. au Sénégal, p. 11 (1757); Férussac, Prodr. Hist. Nat. Moll. Terr. pp. 99, 
109 (1821); H.& A. Adams, Gen. Recent Moll. ii. p. 248; Pfeiffer, Monogr. Auric. p. 65 ; 
Fischer & Crosse, Miss. Scient. Mex., Moll. i1. p. 25. 
Shell subglobular, imperforate, thick, with spiral furrows, unicolorous, of rather 
small size ; aperture somewhat large, with a strong parietal fold and two columellar 
teeth; outer margin of the aperture straight, inside callous or toothed. Foot of the 
animal divided by a transverse furrow, by which it is enabled to loop in crawling, like 
the larva of a Geometrid moth (Adanson, “ pedi pes subsequens ”). 
Scattered throughout the tropical and subtropical shores, chiefly of the Atlantic 
basin, on stones and rocks at high-water mark. 
1. Pedipes angulatus. 
Pedipes angulata, C. B. Adams, Ann. Lyc. Nat. Hist. N. York, v. p. 431 (1852)*; Carpenter, 
Report Moll. West Coast of N. Am. p. 316 (1857) °. 
Pedipes angulatus, Pfeiffer, Novitates Conch. i. p. 24, t. 6. figg. 26-28° ; Monogr. Auric. p. 7145 
Catal. Auric. Brit. Mus. p. 53’. 
Globose, angulated in the upper part of the last whorl, olivaceous-brown, with two strong parietal folds, the 
upper one more sharp and prominent, and with a smaller columellar fold; outer margin of the aperture 
thickened, with a blunt tooth. 
Long. 74, diam. 5; apert. 4 millim. 
Hab. S. Panama: Panama, under stones at high-water mark (C. B. Adams 1°). 
Two other species, P. /zratus, Binn., and P. unisulcatus, Carp., are found in the 
peninsula of California (see Carpenter, Report Moll. W. Coast of N. Am. pp. 275, 316; 
Binney, Land and Freshwater Shells of N. Am. ii. p. 69; and Fischer & Crosse, Miss. 
Scient. Mex., Moll. ii. pp. 28, 29); another, P. mirabilis, Meg. (Pfeiffer, Monogr. 
Auric. p. 70), in Cuba, Jamaica, Puerto Rico, and Guadaloupe. It is probable, 
therefore, that the genus is represented all along both shores of Mexico and Central 
America. 
