THE CENERÀ AND SPECIES OF ROSSELLIRA E. 



47 



Loc .: Pinguin Islands. 



14. B. bacali fer, F. E. Sch. 



Schulze (Chall Rep. Hex , p. 154, pl. LIX 10—18). (Rev. Asc. u. Ross., 

 p. 535). 



Loc. : South Pacific. 



15. B. laevis, F. E. S. 



Schulze (Hex. Ind. Oc, II, p. 57, T. VI 1 -10). (Rev. Asc. u. Ross., p. 

 535). 



Loc. : Bay of Bengal. 



VlTROLLULA, n. g. 



Autodermalia, stauractins or stauractins and pentactins. Hypodermal pen- 

 tactiu present. Gastralia, hexactins and pentactins. Parenchymal megascleres 

 with or without hexactins. Intermedia, of oxyhexaster and discohexaster ; the 

 latter in one kind. 



This genus is closely relate ! to Crateromorpha, but is distinguishable by the 

 absence of distinct stalk to the sponge body. 



lf>. V. fertile, n. sp. 



Body ovoid or spindle-shaped, attached by one end to firm substratum ; small, 

 up to 15 mm. in total length. Autodermalia, of sparingly rough stauractins 

 with rays 180 — 340 // long. Hypodermal pentactin moderately large. Gast- 

 ralia, hexactins and pentactins occurring in a sparing number. Parenchymal 

 megascleres, chiefly diactins, but hexactins are of common occurence amongst 

 them. Intermedia of two kinds: (~hylie.va.sfcr, 120 fx in average diameter; 

 each short principal bearing 4 — 7, slender, straight, rough-surfaced, divergent 

 terminals. Mici odiscohexasler, of usual shape, 26 — 30 ;x in diameter. 



All specimens examined contained numerous larvae in various stages of 

 development. These are at a certain stage spherical, covered externally by 

 ciliated cell-layer and contain internally a mass of cells. Stauractinic spicules 

 are the first that appear in the periphery of the internal mass. Later, the 

 larvae are spindle-shaped, thickest nearer to one end. 



Loc. : Sagami Sea. 



