ISOPS CONTORTA. 221 



Choanosomal oxyasters: Rays not numerous, smooth, pointed; centrum 

 small; total diameter 24 /i. Oxysphaerasters : numerous conical rays; centmm 

 very large; total diameter 20 //. Steirasters: 62 /i long and broad, 52 /« thick. 



Western Pacific. Java Sea; Caspar Strait. 



CAMINnS O. ScHM. 



Among the megascleres are regular triaenes. The tetraxon megascleres 

 are confined to the superficial part of the sponge and arranged radially. The 

 dermal microscleres ai'e asters. The afferents are cribriporal, the efTerents larger 

 oscula. 



Four species are known, one of which, C. chinensis Lindgren, occurs in the 

 Pacific Ocean. 



Caminus chinensis LiNDnnEN. 



Zool. anz., 1897, 20, p. 485. Zool. jahrb. Syst., 1898, 11, p. 339, plate 17, fig. 16, plate 20, figs. 2a-e, e. 

 Lendenfeld. Tieireich, 1903, 19, p. 92. 



Spherical or ellij^soidal, erect. Brown. Cortex very hard. 



Amphistrongyles: 720 by 24 /t. Orthotriacnes: rhabdome 460-600 by 36 /i, 

 blunt; clades 325-540 ji long; clade-angles, according to the figure 90-100°. 



Oxyasters : centrum small ; total diameter 24-32 /i. Sphaeres : 2-5 p. in diam- 

 eter. Sterrasiers: 136 by 108 by 90 /i. 



Northwestern Pacific. China Sea; Strait of Formosa. 



ISOPS SOLLAS. 



Among the megascleres are regular triaenes. The tetraxon megascleres 

 are confined to the superficial part of the sponge and arranged radially. The 

 dermal microscleres are asters. The afferents are uniporal; the efferents uni- 

 poral. 



Of the seventeen species known four occur in the Pacific Ocean. 



Isops contorta (Bowerb.^nk). 



SoLLAS, Rept. voy. "Challenger," 1888, 25, p. 271. Lendenfeld, Tierreich, 1903, 19, p. 97. 

 Pachi/mastinn conlorta Bowerbank, Pioc. Zool. soc. London, 1873, p. 327, plate 31, figs. 7-11. 



Branching, branches anastomosing. Dry: light brown. 



Large amphioxes: 1.838 mm. by 35 /jl. Small amphioxes: about 0.5 mm. 

 long. Styles: 1.3 mm. long. Triaenes: rare. 



Oxyasters: total diameter 32 /(. Small sphaerasteis: rays conical; total 

 diameter 70 /(. Sterrasters flattened, ellipsoidal, 160 /< long. 



Western Pacific. Fiji Islands. 



