188 SB ELLS OF LOWER CALIFORNIA— STEARNS. 



m adults, and shows three revolviui;- keels or ribs on the basal whorl, 

 varying in promineuce iu different individuals, and traversed and more 

 or less interrupted hjll to 12 longitudinal ribs, which, at the points of 

 intersection with the transverse keels, produce moderately rough spinose 

 processes; in fine and old specimens these are quite sharp, otherwise 

 sculptured with narrow, close, scabrous revolving ribs. A rather rare 

 form, undonbtedly purpuroid. Compare with Purpura gallea from 

 Cuba. Large specimens look very much like some of the so-called 

 Cumas. Tryon's figures do not represent such fine examples as these 

 collected by Fisher, though the national collection contains specimens 

 that agree with the figures referred to, that have been received from 

 other sources. 



Family S c a 1. 1 d jv. . 



OPALIA CRENATOTDES, vnr. INSCITLPTA. (' ar j) e ii ter . 

 One example. Angeles Bay (No. 4Cli00, U. S. N. M.). 



Sviperfamily T..^E;]SriOC3-I^OSSA. 



Family Tritonid je. 



TRITON (LAMPUSIA) VESTITUM, Hinds. 



One specimen, dead. Tres Marias (No. 32329, IT. S. N. M.); also 

 Panama, T. Bridges (No. 32320, U. S. N. M.). Two examples. 



Likely to be confounded with the Indo-Pacitic^^itero-e, which it much 

 resembles. A rare species. 



RANELLA NANA, Br ode, rip iiud Sowerby. 

 Reevk, Conch. Icon; Monog. Ranella, PI. vi, figs. 2da, 29b, 



One specimen; San Lucas Cove (No. 32315, IT. S. N. M.). 



A rare species, heretofore reported from San Bias, Hinds; Mazafclan, 

 Melchers; Panama Cuming; also at the latter place by C. B. Adams, 

 who found two examples, both crab shells; one specimen in the Stearns 

 collection was collected at Panama by the late Thomas Bridges (No. 

 32314, U. S. N. M.). 



Family Cassidid^. 



CASSIS (CASMARIA) VIBEX-MEXICANA, S t e a r n s. 

 Casmaria vihex-mexicava, Stearns, Proc. U. S. Nat. Museum, Vol. xvi, 1893, p. 348. 



One example, a crab shell (No. 88831, U. S. N. M.); Maria Madre, 

 Tres Marias; La Paz, Belding. 



CASSIS (LEVENIA) COARCTATA, Sowerby. 



Numerous specimens. 



Tres Marias (No. 47146, IT. S. N. M.). Sta. Margarita Island (common), 



