PLATE II 



Salpa thompsoni sp.nov. 



A. Solitary form, dorsal view of the holotype (body length 71 mm.). 

 B. Aggregate form, dorsal view of the allotype (total length 

 34 mm., body length 20 mm.). C. SoUtary form, postero-dextro- 

 dorsal view, semidiagrammatic. (i) transverse ridge, (2) mid- 

 ventral ridge, (3) dorso-lateral ridge, (4) inner dorsal-limiting ridge, 

 (5) outer dorsal-limiting ridge, (6) secondary dorso-lateral ridge, 

 (7) secondary dorsal-limiting ridge, (8) ventro-lateral ridge, 

 (9) medio-dorsal ridge. 



