584 MOLLUSCA. 
11. Littorina philippii. (Tab. XLIII. fig. 12.) | 
Litorina philippii, Carpenter, Catal. Mazatlan Shells, p. 349 (1857) >; Mérch, in Malak. Blatt. vii. 
p. 69 (1860-61) *; Weinkauff, in Martini & Chemnitz, Syst. Conch.-Cab. ed. 2, Litorina, 
p- 104° (nec L. philippiana, Reeve, Conch. Icon. x., Litorina, t. 3. fig. 22, from the 
Philippines, and therefore better written philippina) . 
Littorina parvula (Philippi ?), C. B. Adams, Ann. Lyc. Nat. Hist. N. York, v. p. 398 (1852) *; 
Carpenter, Moll. W. N. Am. p. 188 (1872) *. [See also infra, p. 586. | 
Littorina aspera, var. philippii, Tryon, Manual of Conch. ix. p. 249, t. 44. fig. 84°. 
Very small, the last whorl comparatively large, with impressed spiral striz, about 10 between the suture and 
the basal angle; greyish-white or plainly white, with rather pale brown oblique and slightly waved 
streaks, which are often interrupted at the spiral striae. ” 
a. Long. 10, diam. 7, apert. ? millim. 
b. ” 63, 9 3, ” 43 9 
é. 99 15, ” 83, 9 73 ” 
aandc. Dimensions given by Carpenter’, reduced to millimetres,c an extraordinarily large specimen ; 
b. Specimen from Mazatlan, given by Forrer. 
Hab. N.W. Mexico: Mazatlan, common (Reigen1; G. A. Ringe, in Mus. Hamburg. ; 
Forrer, coll. Dunker). 
?W. Costa Rica: Punta Arenas, one specimen ((@rsted 2). 
S. Panama: Taboga Island and Panama, in the cavities of rough ledges of rocks at 
and above high-water mark (C. B. Adams**). 
This species approaches L. lineata of the Atlantic coast, but may be distinguished 
from it by the blunter form, the aperture occupying usually more than half the whole 
shell. The colour is somewhat variable according to Carpenter}, ‘“livida” or 
“ olivaceo-livida,” the streaks olive-brown, almost always in slanting lines more or less 
interrupted ; in the specimens collected by Ringe it is greyish-white, somewhat darker 
on the lower half of the surface between suture and basal angle of the last whorl (this 
being the common coloration of L. lineata), the streaks either pale brown or, in some 
specimens, dark brown, oblique, and slightly waving. From JZ. aspera it differs in the 
much fainter sculpture, but as in that species the upper whorls are not so strongly 
sculptured as the last one, it is sometimes difficult to determine specimens when they 
are not full-grown (see Carpenter '). 
Var. penicillata. (Tab. XLIII. fig. 14.) - 
Litorina philippii, var. penicillata, Carpenter, Ann. & Mag. Nat. Hist. (3) xiii. p. 477 (1864)’; 
Moll. W. N. Am. pp. 104, 216°. . 
Litiorina aspera, var. penicillata, Tryon, Manual of Conch. ix. p. 250, t. 44. fig. 85 °. 
Spiral striee much fainter, only visible under a strong lens. Most specimens white, with pale brown, oblique, 
slightly waved streaks, and two well-defined narrow blackish spiral bands, the one above, the other 
below the basal angle of the last whorl. 
a. Long. 10, diam. 6, long. apert. 54 millim. 
b. 99 113, 29 7, 99 6 99 
a. Ordinary size ; 6. The largest among many specimens. 
