118 ^fr. H. J. Carter on the Genus Rossella. 



sponge growing upon little bundles of anclioring-spiculos pro- 

 jecting from the surface, it seems probable, if these do not 

 originate in ova which have respectively fixed themselves 

 there for development, that they arise from pullulation or 

 budding. 



In my description of li. antarctica the spicules are numbered 

 1 to 1 inclusively, to avoid unnecessary repetition in tlic fol- 

 lowing species, which will also be described generally with 

 reference to what has already been stated. 



Lastly, by comparing my representation of R. antarctica 

 (PI. X. tig. 4), and its previously delineated spicules {l. c.), 

 with Schmidt's representations ot his ^''IloUema Pourtnlcsn' 

 ('Atlantisch. Spongienfaun.' Taf. i. fi^. 1-6), the probability 

 of the latter being a species of Bossella, as I have heretofore 

 stated, will appear still greater. 



Rossella j}lulijyp€nsis, Gray. PI. X. fig. 1. 



General form globular (fig. 2), ovate, or cup-shaped (fig. 1), 

 thus perhaps varying in accordance Avith the age, development, 

 and wearing of the specimen ; presenting a flattened summit 

 in which there is an aperture (fig. 1,^)^ and a conical base 

 which is closed, but rendered irregular by mammiform pro- 

 longations of the body, out of each of which issues a hair- 

 like lock of long anchoring-spicules (fig. l,cccc) • mammi- 

 form prolongations &c. increasing in size with age, dispersed 

 over the body generally, but largest and most prominent at 

 the lower part. Aperture circular and contracted in the young 

 or globular forms (fig. 2, h), elliptical elongate in the ovate, 

 and patulous in the old, worn or cup-like form (fig. l,d) j 

 leading into a cavity of much the same shape as that of the 

 sponge externally. Sessile or fixed by the anchoring-spicules. 

 Coloiu- grey. External surface uniformly even, except where 

 interrupted by the mammiform prolongations of the body ; 

 cribellate immediately below the latticework layer, surmounted 

 by one form of spicule onli/, which issues, as before stated, in 

 hair-like locks from the summits of the prolongations, and 

 will be more particularly described hereafter. Internal surface, 

 or that of the caA-ity, unifonnly smooth, inteniiptcd by de- 

 pressions or pits (fig. l,ee), so increasing in size downwards 

 as to occupy the whole of the lower part. Body or wall the 

 same as in the foregoing species. External or dermal surface 

 covered by the same kind of latticework. Pores and vents 

 the same respectively. Spicules of three kinds, viz. appen- 

 dicular, structural, and flesh -spicules. A. A})pendicular, of 

 one form only, viz. tlie '' anchoring " one, no. 2 in the fore- 



