456 Vniversitu of California Puhlications in Zoology [Vol. 16 



stitute good diagnostic features. In form, the ovary seems to resemble 

 that of A. aperta Sluiter more than that of any other species ; but 

 the distribution of the lobes in the two is quite different, the broad, 

 simple loop of the intestine of aperta making it impossible for the 

 ramification to implicate so large a portion of the loop as it does in 

 calif ornica. But in most respects aperta and calif ornica are very 

 distinct. 



A. calif ornica probably resembles Ascidia {Phallusia) ceratodes 

 Huntsman from the coast of Briti-sh Columbia more closely than any 

 other species, but from this it is distinguished by its smaller size, 

 larger number of internal vessels, both longitudinal and transverse, 

 smaller number of folds in the stomach, and most positive of all, more 

 diffuse character of the ovarian lobes. 



In view of the fact that the species Ls fairly common in the whole 

 California littoral and seems not to occur much beyond this region, 

 to the north, at least, we have felt that it is sufficiently typical of the 

 region to merit the specific name californica. 



Habitat and range. — On imder sides of rocks at extreme low tide, 

 the California coast from San Diego to Half Moon Bay (Mendocino 

 County) ; also on kelp holdfasts (La JoHa) and "eel-grass" (Tomales 

 Bay). Also to depth of thirty meters off San Diego. 



From the material and data at our disposal the species seems to 

 reach its best development at Santa Cruz. 



List of localities. — San Diego region, almost everywhere, including 

 San Diego and False Bays as well as points on the open coast, especially 

 at La Jolla ; Laguna Beach ; San Pedro ; San Clemente Island ; Mon- 

 terey Bay ; mouth of San Francisco Bay ; Tomales Bay. But at none 

 of the stations except in Monterey Bay, at Santa Cruz, has it been 

 taken in large numbers massed together in the fashion characteristic 

 of many ascidian species. 



Type locality. — La Jolla. 



Cheylosoma productum (Stimp.) 



Cheylosoma proAuctua, Stimpson, 1864, p. 161. 

 Cheylosoma productum, von Drasche, 1884, p. 281. 

 Cheylosoma productum, Bancroft, 1898, p. 309. 

 Cheylosoma productum, Huntsman, 1911, p. 124. 



The prevailing size and elevation of specimens of this species, 

 occurring on the California coast, are so much less than similar dimen- 

 sions of animals from Puget Sound, the type locality, as to seem almost 

 to justify the recognition of a subspecies for the southern forms. 

 However, neither the detailed anatomical studies by Bancroft (1898) 



