194 UNITED STATES NATIONAL IVIUSEUM BULLETIN 251 



Figure 84. — Styela izuana hawaiiensis, new subspecies: a, dorsal side of 16 mm. individual; 

 b, left half of mantle body, inner side; c, right half of same; d, intestinal loop; e-g, 

 ciliated grooves; h, anus. 



niata in each mesh, may be up to nine in those along endostyle. Ten- 

 tacles about 20, excluding minute ones. Ciliated groove an elongated 

 slit or small oval opening, represented in a specimen by two orifices 

 (fig. 84/). Alimentary canal rather small, occupying posteroventral 

 one-third of left side. Second intestinal loop shallow, with axis pass- 

 ing through cardiac portion of stomach, which is elongated in extended 

 state and has about 15 longitudinal plications on surface and distinct 

 pyloric caecum. Stomach larger than half of ventral branch of first 

 intestinal loop. Esophagus not so long. Anal margin cut into 20-25 

 lobules. A single elongated gonad on each side. Testicular follicles 

 confined to area around posterior lialf or posterior end of gonad. 



Remarks. — The present specimens resemble very closely Styela 

 izuana (Oka), 1934, from Japanese waters in the general appearance 

 of tlie body and in the number of the gonads, but diil'er from the latter 

 in the following points: (1) The alimentary canal is larger in S. 



