PACIFIC TUNICATA OF U.S. NATIONAL MUSEUM 



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Figure 92. — Herdmania momus f. grandis (Heller): a, external appearance of an 85 mm. 

 specimen; b, left half of mantle body of same specimen, inner side; c, dorsal tubercle of 

 same specimen; d, dorsal tubercle of a 160 mm. specimen. 



long-itudinal vessels arranged on left side of an 85 mm. long specimen 

 ( D = dorsal , V = ventral ) : 



D 8 (20) 3 (26) 3 (31) 4 (33) 2 (29) 5 (32) 5 (32) 2 (30) 



3 (29) 4 (25) 3 (22) 1 (1.5) V 



Dorsal tubercle fairly large, round, about 5 mm. in diameter in an 

 85 mm. long individual (fig. 92c) or elliptical and 10 mm. long in the 

 160 mm. long individual (fig. 92^/) ; ciliated groove represented bj a 

 number of undulating grooves. Tentacles '^)8 in an 85 mm. long in- 

 dividual; large, medium, and small tentacles differentiated and ar- 

 ranged: large small medium small large; branches in three ordei-s. 

 Many copepods and amphipods were found commensal in branchial 

 sac in respective specimens. Gonad massive. 



110. Microcostnus exasperatus Heller 



Figures 93-97 



Microcostnus exasperatus Heller, 1878, p. 99, pi. 3, fig. 19. — Van Name, 1945, p. 



346, figs. 230-231; pi. 16, fig. 3 (synonymy).— Tokioka, 1952, p. 130, fig. 25. 

 Microcostnus kura Brewin, 1948, p. 130, fig. 9 ; pi. 9, figs. 5, 13D. 

 Microcostnus claudicans var. australis Kott, 1952, p. 288, figs. 139-144. 



MATERIAL EXAMINED 



China : Amoy ; received October 12, 1932, from T. Y. Chen, University of 

 Amoy; sta. 2, cue specimen (USNM 11528); sta. 11, one specimen (USNM 



