The Nautilus. 



Vol. VII. APRIL, 1894. No. 12 



THE CALIFORNIAN SPECIES OF THE GENUS NUTTALLINA. 



BY W. J. RAYMOND, OAKLAND, CALIFORNIA, 



In the Manual of Conchology, Vol. 14, p. 280, after directing 

 attention to the differences existing between Nuttallina californica 

 Nutt. and N. scabra Rve., Mr. Pilsbry remarks that data are desir- 

 able concerning the areas of distribution of the two species along 

 the Californian coast, especially between San Diego and Point Piedras 

 Blancas, near San Simeon. Having collected numerous specimens 

 of this genus at various points between Bolinas and Santa Barbara, 

 I can offer the following notes. 



A glance at a map of the AVest Coast will recall certain geograph- 

 ical features bearing upon the distribution of marine life. Going 

 southward from San Francisco, the coast line which has followed a 

 general southeasterly direction, bends abruptly to the east at Point 

 Concepcion. As a result of this, the great ocean current from the 

 north which has held to a course near the coast and parallel with it, 

 all the way from Alaska, leaves it for the first time and flowing 

 southward, is still further deflexed by the chain of the Santa 

 Barbara islands. From Point Concepcion eastward, the ocean is 

 warmer and the other conditions surrounding marine life are such 

 as to warrant the expectation of an assemblage of species, different 

 from those found north of the cape. While many species of mollusks 

 are common to our whole Californian coast, Terebra simplex, Drillia 

 hemphilli, Marginella varia, Cypraea spadicea, Trivia solandri, Tur- 

 ritella coojjeri, Norrisia norrisii, Trophon belcheri, T. iriangulatus, 

 Periploma planiiiscula and Barbatia gradata are species of a more 

 southern fauna, found in Santa Barbara county, which do not as far 



