228 PROCEEDINGS OF THE ACADEMY OF [1887. 



(12) Meyenia (Spongilla) capewelli, Bk. Proo. Zool. Soc. etc. 186.3, p. 417. 

 "Sponge massive, sessile ; surface iineveu, 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 ; rotula? 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. ISSl, p. 95. 



"SjDonge unknown, statoblast flask shaped; aperture terminal; 

 composed of a membranous coat, striated longitudinally, supporting 

 a reticulation consisting of extremely minute, erect, conical processes 

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

 interstice, esijecially 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 transparent, presenting the usual 

 polygonal reticulation without granules, like compressed cell- 

 structure." Carter. 



Loc. River Amazons. 



(14) Meyenia ramsayi, W. A. Haswell. Proc. Linn. Soc. New South "Wales, 

 1882, p. 209. 



"Sponge massive, tubercular, with finger-like jorojections. 

 Skeleton-spicules curved, abruptly pointed, smooth. 

 Birotulate spicules, shafts cylindrical, with one to ten prominent 

 spines ; rotulse deeply dentate ; twelve to twenty teeth. 

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



(15) Meyenia crateriformis, Potts. Proe. Acad. Nat. Sci. etc. 1882, p. 12. (PL 

 V, fig. vL PI. X, tig. V.) 



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

 skeleton. 



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

 or outer side of the sponge. Gi'anular crust relatively extraordi- 

 narily thick, embedding slender spicules of great length. The 

 foraminal tubule, standing at the centre of a crater-like depression 

 amongst these, has suggested the sj)ecific name. In position the 

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



