THE GENERA AND SPECIES OF ROSSELLIDAE. 



43 



2. L scoliodocus, n. sp. 



( ìlobular or ovoid sack, up to the size of a hazel-nut. Rays of dermal pen- 

 tactins straight, but those of parenchymal and gastral hexactins curved. 

 Hexactinose macrodiscohexaster as in foregoing species. Microdiscohexaster 

 spherical, 46 — 70 /i or more in diameter ; each short principal bearing 4 — -10, 

 straight or nearly straight terminals ; discs about equidistant at the peripheral 

 surface of the spicule, toothed. Of inconstant occurrence is a third modification 

 of discohexasters, which I should call clavicome. This most nearly resembles the 

 sigmatocome of Schulze. Diameter 38 — 50 fx ; principal takes about \ of a ray 

 and bears a narrow perianth of very slender, terminally swollen terminals set in 

 a single whorl. 



Loc. : Sagami Sea ; found attached to Hexadinella lorica, Ij. MS. 



C H A U N O P I. E C Ï E L L A, Ijima. 



Thick-walled goblet of egg-like shape, attached by a short stalk-like base. 

 Parenchymal megascleres, chiefly hexactins and diactins with bent rays. Inter- 

 media, of two kinds : large macrodiscohexaster and small clavicome. 



3. C. cavernosa, Ijima. 

 Ijima (Zool. Anz , p 250). 

 Loc. : Sagami Sea. 



Placoplegma, F. E. Sch. 



4. P. solutum, F. E. Sch. 



Schulze (Hex. Ind. Oc, IL, p. 03, pl. VI. 11—77). (Rev. Asc. u. Ross., 

 p. 544). 



Loc. : Bay of Bengal. 



Aulooalyx, F. E. Sch. 



5. A. irregularis, F. E. Sch. 



Schulze (Chall. Rep. Hex., p. 174, pi. 174, pl. LX).— (Revision Asc. u. 

 Ross., p. 544). 



Loc. ; olì' Marion Island, SE of Cape of Good Hope. 



