PACIFIC TUNICATA OF U.S. NATIONAL MUSEUM 



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Figure 90. — Pyura vittala (Stimpson): a, specimen from Palau; b, mantle body, from right 

 side; c, left half of mantle body, inner side; d, right half of same; e, ciliated groove; 

 /, spinule from inner surface of siphons, highly magnified. 



Left D 1 (10) 2 (4) 2 (12) 2 (12) 2 (10) 1 (4) 1 V 



Right I) 2 (10) 2 (0) 3 (12) 2 (D) 2 (3) 1 (2) V 



Second fold seems to be smaller than first or third fold. Two to three 

 stigmata in each mesh, parastigmatic vessels present. Tent acles about 

 10( ?) ; only branch of first order present, small, rather few. Ciliated 

 groove C-shaped, opens towards left. Liver greenish brown, consists 



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