228 PROCEEDINGS OF THE ACADEMY OF [1887. 



(12) Meyenia (Spongilla) eapewelli, Bk. Proc. Zool. Soc. etc. 1863, p. -447. 

 "Sponge massive, sessile ; sui'foce uiieveu, often lobular, smooth. 



Oscula simple, minute, dispersed. Pores inconspicuous. Dermal 

 membrane pellucid, aspiculous; skeleton spicula acerate, rather short 

 and stout. Ovaria subglobose ; spicula birotulate, rather long, dis- 

 posed in lines radiating from the centre of the ovary ; rotulai flat, 

 margins slightly and irregularly crenulate; shafts slender, incipiently 

 spinous, varying in length from one to one and a half diameter of a 

 rotula. Color dull green, with a tint of yellow." Bowerbank. 

 Hah. Lake Hindmarsh, Victoria, Australia." 



(13) Meyenia anonyma, Carter. Ann. and Mag. etc. 1881, p. 95. 



"Sponge unknown, statoblast flask shai:)ed; aperture terminal; 

 comjDosed of a membranous coat, striated longitudinally, supporting 

 a reticulation consisting of extremely minute, erect, conical processes 

 with their sharp ends inwards, and presenting in the centre of each 

 interstice, especially towards each fundus, a short, thick, somewhat 

 hour-glass-shaped spicule, whose outer end is more or less denticula- 

 ted and whose inner one is inserted into the striated coat. Investing 

 membrane of the germinal matter transpai'ent, presenting the usual 

 polygonal reticulation without granules, like compressed cell- 

 structure." Carter. 



Loc. River Amazons. 



(14) Meyenia ramsayi, W. A. Haswell. Proc. Linn. Soc. Ifew Soutli Wales, 

 1882, p. 209. 



"Sponge massive, tubercular, Avith finger-like projections. 

 Skeleton-sjiicules curved, abruptly pointed, smooth. 

 Birotulate spicules, shafts cylindrical, with one to ten prominent 

 spines ; rotulpe deeply dentate ; twelve to twenty teeth. 

 Loc. Bell River at Wellington, Australia." Haswell. 



(15) Meyenia crateriformis, Potts. Proc. Acad. Nat. Sci. etc. 1882, p. 12. (PI. 

 V, fig. vi. PI. X, fig. V.) 



Sponge encrusting, thin ; texture very loose, forming no tangible 

 skeleton. 



Gemmules small, white, very numerous, visible from the upper 

 or outer side of the sponge. Granular, crust relatively extraordi- 

 narily thick, embedding slender spicules of great length. The 

 foraminal tubule, standing at the centre of a crater-like dej^ression 

 amongst these, has suggested the specific name. In position the 

 shafts of these long birotulates are rarely parallel, but, leaning to 



