NO. 1555. HAWAIIAN HOLOTHURIANS— FISHER. 679 



lacking the C-shapecl bodies, has not l)een detected in the Hawaiian 

 group. Theel records the present species from the Friendly, Samoan, 

 Fiji, and Pelew islands, and Lanipert adds Cebu. 



SynaUacthiK Ludwk;, iVIem. ]Mn8. Zool., XVII, No. )!, 1S94, pji. 8 and 26. 



Genus MESOTHURIA Ludwig. 



il/es/te LuDwiG, Zool. A-nz., 1893, p. 7^). Type, M. Niu/fij»s Ludwig, noinen nudum. 

 Mesothuria Ludwig, INIein. i\Ius. Conip. Zool., XVII, No. .'5, 1894, p. 31. Type, 

 M. vmltipfii Ludwig. 



Body c} lindrical or with slightly flattened ventral surface; no brim. 

 Tentacles 12 to 20. Pedicels on lateral ventral radii always well 

 developed; as a rule small on mid-ventral region (rarely absent); 

 small, scattered and papilliform on back. Deposits: Tables. Body 

 wall thin as a rule. Gonad in a single tuft on left of dorsal mesen- 

 tery. No tenacle ampulhe. Longitudinal nmscles undivided. 



MESOTHURIA CARNOSA, new species. 



Plate LXX, figs. 4, 4-/-/,- youug, Plate LXXI, figs. 4, 4^. 



Size rather large. (leneral form cylindrical, oblong, tapering 

 abrupth" at either end. Body very limp and soft, but integument 

 firm; dorsal body wall apparently thicker than ventral. Mouth ter- 

 minal but directed ventralwards in life; amis terminal. Tentacles 18 

 to 20, with rather small peltate crowns. Ambulacral appendages in 

 the form of small pedicels scattered rather thickly over the ventral 

 .surface, those of either ventrolateral ambulacrum somewhat larger 

 than in midventral region, where they are very small; pedicels of 

 dorsal surface few, widely scattered and small in size. Here and there 

 are low thickenings of the integument suggesting wart-like swellings. 

 Deposits: Tables of rather large size, very crowded, and composed of 

 a l)road disk, irregular in outline with numerous perforations, and a 

 spire composed of four rods, one cross) )eam (besides those of crown), 

 and a crown of four upright often divergent teeth, with one to several 

 smaller denticles on sides. In pedicels are comparatively very small 

 tables with three or four uprights and reduced disks. Under the 

 tables, and apparently in the subcutaneous muscle la3'er also, are 

 smooth, scattered, simple, ver}" delicate, and slender spicule-like rods. 

 Apparently no supporting rods in pedicels. In oral disk and tentacles 

 nearly straight to irregular spiny rods, 0.1 to 0.5.5 nmi. long. (Plate 

 LXX, tig. 4 y.) Color in life: translucent pinkish white, more or less 

 stained with brownish, often dirty whitish or shade conmiinily called 

 flesh color. Ventral surface is darker on account of leaden purplish 

 muscle l)ands of mid-ventral amlndacrum showing through l)ody wall. 

 Tentacles translucent gra34sh white; crown mottled yellowish white 



