172 SHELLS OF LOWER CALIFORNIA— STEARNS. vol.xvii. 



form, tbe peripheral eariua being the most prominent; between the keels 

 the surface is finely spirally threaded. 



PLEUROTC^MA (SURCULA) FUNICULATA, Y a 1 e u c i e ii ii e s . 



One specimen at each place. 



8au Lucas Cove (No. 55235, LT. S. N. M.) ; Loreto. A line, large, dark, 

 chocolate-colored living example, 2.49 inches in length by .84 inch in 

 breadth, was found, with many other pleurotomids, as above. Though 

 not a rare form, it is apparently less common than its near relative, P. 

 olivacea Sby. /*. fimiculata, though a less robust shell and not as 

 coarsely sculptured as olivacea, exhibits in a striking degree the charac- 

 teristic sculpture of olivacea; it is generally darker colored, though 

 frequently of an olive green or greenish clay color, sometimes yellowish 

 brown and again dark chocolate. The color in many of the species is so 

 exceedingly variable as to be of little value as a specific distinction. 



PI.EUROTOMA (SURCULA) OLIVACEA, So werby. 



One specimen (No. 55233, U. S. N. M.). Boca de los Piedras. 

 An adolescent example, dredged at the above place, -94 inch length, 

 of a clear white, without epidermis. 



PLEUROTOMA (SURCULA) TUBERCULIFERA, Biod. and Sby. 



One specimen. San Lucas Cove (No. 55228, U. S. N. M.). 



An exceedingly fine example of this strongly characterized species 

 was obtained with the dredge. It is a rare form and seldom met with 

 in collections. 



PLEUROTOMA (SURCULA) MACULOSA, Sower by. 



Five exami)les dredged (No. 55259, U. S. N. M.). San Lucas Cove. 

 One of these was a fresh, perfect shell. 



PLEUROTOMA (DRILLIA) UNIMACULATA, Sowerby. 



One specimen. San Lucas Cove (No. 55239, IT. S. N. M.). 



One example of the above was collected at this j)lace, which seems to 

 be rather the metropolis of pleurotomid forms in this general region. 

 It closely resembles eckiriatus Lam., said to come from New Guinea. 

 P. unimaculata is a narrower shell, and has heretofore been credited to 

 the west coast of Central America. They both seem to be very close 

 to the P. gihhosa of Kiener. The specimen under review is much nearer 

 to ecliinata Lam. than to Kiener's gihbo.'ia, as these two species are rep- 

 resented in the figures given by Chenu, Manual, Vol. I, figures 640 and 

 G50. Unimaeulata is an unfortunate name, as names based on color 

 markings frequently prove to be; for in the instance before me, there is 

 not only a large brownish spot on the basal whorl, but all of the numer- 



