262 TRANSACTIONS LIVERPOOL BIOLOGICAL SOCIETY. 



nearly obliterated by the transverse ones. The apertures 

 are placed near together at the extremity of the body on 

 slight protuberances, which are probably produced in life 

 into short tubes. Branchial sac with 10 slight longitu- 

 dinal folds, not lamelliform ; filaments at its summit 

 numerous, small, slender, and simple. 



" The largest specimen is 1*4 inch in length, and 0*6 

 in breadth. Port Townsend, . . . and N.W. end of 

 Lummi Island." 



The external appearance of our specimens agrees per- 

 fectly with that description, and the only doubt arises 

 from the fact that our specimens are a Styela with four folds 

 on each side of the branchial sac, while Stimpson mentions 

 ten folds in all, and therefore very properly calls his 

 species a Cynthia. If, however, he was mistaken as to 

 the number of folds, or counted in the endostyle and 

 dorsal lamina, then that would account for his number 10, 

 and I am inclined to think this must be the case. Instead 

 then of describing our form as a new species of Styela 

 I think it best to regard Stimpson' s species of " Cynthia " 

 as our Styela, and to re-describe it from our specimens, 

 as follows (see PL XIIL, figs. 1 — 4): — 



External appearance. Body very much elongated, 

 club-shaped, or of narrow oval form with the broader end 

 anterior. Attached by a small area at posterior end. 

 Siphons placed close together at the anterior end, not 

 prominent. Surface deeply furrowed longitudinally and 

 closely wrinkled transversely. Colour yellowish brown, 

 with a greenish tinge in places. Length 5 cm., breadth 

 1*5 cm., thickness 1 cm. 



Test moderately thick, very tough, inner surface smooth 

 and shining. 



