172 PROOEEDrXOf^ OF THE XATTOXAL MUfiErM. vol. a?. 



more or less produced in thread-like filaments; aperture large, Urate 

 on the body callus and denticulate on the varicose outer lip, the 

 denticles more or less painted with black streaks and associated in 

 separate pairs. 



This species is rare and without economic importance. 



CYPRiEA ANNETTE Dall. 



Cyprsea annettse Dall, Nautilus, April, 1909, p. 125. 



Cyprsea sowerhyi Kiener, Icon., Cypraea, 1845, p. 38, pi. 7, fij?. 3. Not C.soimrbyi 

 of Gray, 1832; or Anton, 1839. 

 Beach of Sechura Bay, near Matacaballa, one badly worn specimen. 



Distribution. — Gulf of California and southward to Paita and 

 Sechura Bay, Peru. 



This species has no economic relations. 



CERITHIUM STERCUSMUSCARUM Valenciennes. 



Cerithium stercusmuscarum. Valenciennes, Humboldt Voy., vol. 2, 1833, p. 278. — 

 SowERBY, Thes. Conch., 1855 (as C. ocellatum), p. 865, pi. 179, figs. 59, 73. 

 li'rom the shell bank at Matapalo near Capon. Occurs in great abundance on shelly 

 ground, but is of no economic importance. 



Distribution. — From Cedros Island, Lower California, and the 

 Gulf of California, southward to Panama, Tumbes, and the Galapagos 

 Islands. 



TURRITELLA GONIOSTOMA Valenciennes. 



TurritMa goniostoma Valenciennes, Humboldt Voy., vol. 2, 1833, p. 275. — 

 Reeve, Conch. Icon., Turritella, 1849, fig. 10, a-b. 

 Island of Loboa de Tierra, one young shell. 



Distribution.— Gu\i of California and southward to Paita, Peru, 

 and the Lobos Islands. 



Shell slender, elongated, with many flat-sided, spirally threaded, 

 purple and brownish whorls. Aperture subcircular. Length of a 

 full-grown specimen about 75 mm. 



This shell, though common, has no economic importance. 



LITTORINA PERUVIANA Lamarck. 

 Plate 23, fig. 7. 



Phasianella peruviana Lamarck, Anim. s. Vert., vol. 7, 1822, p. 53. — Wood, 

 Index Test, suppl., 1828, pi. 6, fig. 33 (as Turbo zebra). 

 From rocks on the shores of Callao Bay and San Lorenzo Island. Also on the 

 Chincha Islands in similar places, and along shore at Mollendo. Here some of these 

 snails were taken far above the water line. 



Distribution. — From Panama and the Galapagos Islands south to 

 Valparaiso. 



Shell small, conical, turbinate, with a corneous operculum of few 

 whorls; the color black with large oblique blotches or streaks of 



