1907] Ritter. California, Coast Ascidians. 15 



axes in various directions (pi. 2, fig. 18). Dorsal languets rather 

 long, close together, no membrane. 



Digestive Tract. Situated on left side of body, loop regular, 

 rather wide ; stomach not large nor clearly set off from intestine ; 

 a short pedunculate pouch with shallow lobulated surface pro- 

 jecting from ventral edge of the stomach. Gonads two, one on 

 each side of body, the left within the intestinal loop, both elong- 

 ate and tortuous. The ovary constituting the main axial portion 

 of each mass; the tcstis consisting of a double row of somewhat 

 lighter colored elevations, along the outer side of each ovary. 



There are two specimens of this species in the collection ; one 

 (fig. 17) from station 4558 Point Pinos Light, S. 79, W. 2 miles, 

 June 9, 1904, 40 to 48 fathoms, rock bottom; the other from 

 station 4303 (fig. 18), Point Loma Light, N. 12, W. 6.1 miles, 

 March 1, 1904, 21 fathoms, gray sand bottom. 



Cursory comparison of figs. 17 and 19 suggests that the two 

 are quite different animals. This conjecture gains strength when 

 it is noted that the first station mentioned is near Monterey and 

 the other near San Diego. The diagnosis is given almost wholly 

 from the specimens shown in figs. 17 and 19. I am inclined to 

 believe the two to be distinct species ; nevertheless the differences 

 between them are not sufficiently great nor of a kind to warrant 

 the separation on the strength of the single specimen of each 

 available for examination. Although differences exist in some of 

 the internal features as well as in their superficial ones, these 

 differences are still more of a kind that may well be supposed to 

 be individual. Should it in the future be found necessary to 

 separate them, Boltenia echinata would be the name of the 

 Monterey form, and a new name would have to be given the 

 San Diego one. 



Attention may be called to the apparently branched condition 

 of the peduncle of the San Diego specimen. This probably comes 

 from the peduncles of several individuals having fused together 

 during growth, as the parts are now inseparable. 



The transverse direction of the branchial stigmata is an espe- 

 cially noteworthy characteristic of the species. This recalls the 

 same peculiarity in the echinata group of Halocynthias referred 

 to under H. okai of this paper. Of the other Boltenias that pos- 



