218 UNITED STATES NATIONAL MUSEUM BULLETIN 251 



Figure 99. — Microcosmus curvus Tokioka: Specimens from Palau and Saipan: a, dorsal 

 side of specimen from Palauj 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 distal inner 

 surface of siphons, highly magnified; /, left half of mantle body of specimen from Saipan, 

 inner side; g, right half of same; h, ciliated groove; i, anal lobes of same specimen. 



in each mesh, but may be up to 9 in large meshes along endostyle. 

 Tentacles 11 to about 20 in number, usually larger and smaller ones 

 differentiated; also minute ones intervene at some intervals; branches 

 in 2 orders. CUiated groove U-shaped, with one or both horns 

 incurled; in the 13 mm. long specimen from Wake Island, groove 

 represented by two crescent clefts (fig. 98^). 



Bottom of second intestinal loop touches hepatic region of ventral 

 branch of first intestinal loop. Anal margin plain, but may undulate 

 and sometimes form several irregular lobules. Liver pale brownish in 



