BY E. P. KALLMANN. 643 



drical styli of a single kind (measuring 320 to 420//. in length by 

 6/x in stoutness), occasionally transforming into strongyla. Tliis 

 species also appeal's to me to constitute a new generic type. 



Under the name Choiidropsis carteri, Dendy(6) has described, 

 from Port Phillip, a species in which the microscleres are "hair- 

 like rhaphides," the megascleres are slender strongyla (and of a 

 single kind), and the skeleton consists partly of "numerous stout 

 sandy tracts or fibres running more or less parallel to one another 

 towards the surface," and partly of spiculo-spongin fibres. From 

 its description, therefore, the species is one which might appear 

 as possibly admitting of inclusion in a single genus along with 

 Rhaphoxya typica and R. pallida. On examination of its type- 

 specimen, I find, however, that Chundrvpsis cai'teri also belongs 

 to the Tedaniinte; its rhaphides are spinulous, and of two kinds, 

 measuring respectively 100/x and 55/x in length, the shorter ones 

 styliform in shape, up to 1*5/a in stoutness, and relatively scarce, 

 the longer (and slenderer) usually sharp-pointed at both extremi- 

 ties, and occasionally exhibiting a slight dilatation near one 

 extremity. Since, in the case of this species, a new genus is 

 unquestionably required, I propose, in designation thereof, the' 

 name Strongylamma. 



Rhaphoxya typica, sp.nov. 



(PL xxix., fig.3; PI. xxxviii., figs. 8, 9; PI. xxxix., fig.5; 



PL xliL, figs.l, 2.) 



Diagnosis. — Sponge massive, sessile, irregular. Surface rugose, 

 but generally subglabrous: provided with scattered, small, papilli- 

 form elevations. Oscula situated chiefly on the uppermost parts. 

 Dermal membrane easily separable; minutely reticulate to the 

 naked eye, with many dermal pores in each mesh of the reticula- 

 tion. Skeleton lax and rather scanty ; consisting chiefly of 

 ascending, slender, multispicular main fibres; connecting fibres 

 more frequent towards the interior. Megascleres slendei-, cylin- 

 drical; comprising oxea, strongyla, and fewer styli; up to 700 by 

 9/x. in size. Trichites 55 to 400/x long, occurring singly scattered 

 and in dragmata, and also forming short fibres. 



Zoc-.— Port Phillip. 



