PACIFIC TUNICATA OF U.S. NATIONAL MUSEUM 



215 



Figure 97. — Microcosmus exasperatus Heller: Specimens from the Gilbert Islands: a, right 

 side of 16 mm. individual; b, left half of mantle body of same specimen, inner side; c, 

 right half of same; d, ciliated groove of same individual; e, spinule from inner surface 

 of siphons of same specimen, highly magnified; /, right side of 17 mm. individual; g, 

 left half of mantle body of same specimen, inner side; h, right half of same; i, ciliated 

 groove of same individual. 



cial studies are made on many more specimens from various localities. 

 The .smallness of the Saipan specimens might indicate that the ocean- 

 island inhabitants become smaller. The complicated ramification of 

 the l)ranchial tentacles in Amoy specimens might be considered eU'ec- 

 tivo in preventing the inflow of silt or detritus, which might be more 

 abundant in the littoral water along the coast near Amoy than in other 

 localities. 



111. Microcosmus curvus Tokioka 



Figures 98, 99 



Microcosmus curvus Tokioka. 19.")4a, p. 2G3, pi. 37, fig.s. 2-9. 



IMATKRIAL EXAMINED 



Palau Islands : Iwayania Kay ; south end of Guaziiu.i (Islaiul X\ ) ■ GVF stn. 

 92. One specimen 10 mm. long (USNM 11408) found with siwnges. 



