of the Pacific Shores of North America. 525 



PENTACTA MINIATA. Brandt. 

 Cladodactyla miniata, Brandt ; Prod. desc. anim. Mertens., 44. 



Hab. Sitka, (Mertens.) 



PENTACTA NIGRICANS. Brandt. 

 Cladodactyla nigricans, Brandt ; /. c. 44. 



Hab, Sitka, (Mertens.) 



PENTACTA ALBIDA. Brandt. 

 Cladodactyla albida, Brandt ; I. c. 44. 



Hab. Sitka, (Mertens.) 



CUVIERIA SITCILENSIS. Brandt. 

 Cuvieria Sitchaensis, Brandt ; I. c. 47. 



Hab. Sitka, (Mertens.) 



LIOSOMA SITCELENSE. Brandt. 

 Liosoma Sitchaense, Brandt ; I. c. 58. 



Hab. Sitka, (Mertens.) 



LTOSOMA ARENICOLA. Stimpson, n. s. 



Body thick fusiform ; skin coriaceous ; surface smooth 

 and glabrous, without suckers or processes of any kind. 

 Tentacles fifteen in number, very small, contracting into a 

 circular groove at the margin of the mouth, where they are 

 each concealed in a small cavity formed by folds of the 

 skin. Each tentacle is composed of a short peduncle with 

 four or five digitations at the disk -like summit ; these 

 branches being also minutely pinnate toward their extremi- 

 ties. Oral ring composed of five slender calcareous pieces, 



