NEW GENERA AND SPECIES, &c. Sjpong, 11 
pear-shaped, the other fan-like ; based on A. seychellensis^ id. 1. c. p. 16, 
pi. i., Seychelles Islands. 
Tetractinellida. 
Stelletta crassiuscula, Carter, (2) p. 371, Basse Rocks, Ceylon. 
Discodermia sinuosa, Carter, (2) p. 372, pi. xviii. fig. 1, Gulf of Manaar 
and Basse Rocks, Ceylon. D. sceptrellifera, id. L c. pi. xviii. fig. 2, Gulf 
of Manaar. 
Hexactinellida. 
Parafieldingia (L. Vaillant, MS ), A. Milne-Edwards, C. R. xciii. p. 936, 
and note. Based on P. socialise Vaillant, sp. n., 1. c., dredged from the 
deep Atlantic a little to the north of the Berlengaa islands, by the ‘ Tra- 
vailleur’ Expedition of 1881. Differs from Fieldingia in having the 
spherical masses of spicula enclosed in a loosely-felted aggregation of 
long acicular spicules. 
CALOAREA. 
Clathrina poterium = Ascetta p'imordialis^ var. poterium, Hackel, 
described as distinct species by Ridley, (12) p. 133, from S.W. Chili. 
Nardoa pelagica, Ridley, (12) p. 133, pi. xi. fig. 4 ; 
Aphroceras sericatum, id. 1. c. p. 134, pi. xi. fig. 5 ; 
Grantia atlantica, id. 1. c. p. 136, pi. xi. fig. 8 ; all from Victoria Bank, 
off S.E. Brazil. 
Incertjs sedis. 
Cameraphysema ohscura. Under this name is described, P. U. S. Nat. 
Mus. iii. p. 269, figs. 1-7, by J. A. Ryder, as a Sponge, a clavate mass 
which in life protrudes a number of funnel-shaped tubes from its sur- 
face, and appears to consist of a congeries of irregular chambers, from 
which the funnels open : both funnels and chambers are lined by a uni- 
laminar membrane made up of very distinct cells ; segmented ova were 
observed. No fibres, spicules, or cilia were found. [The form can hardly 
be a Sponge, the description rather suggests one of the soft compound 
Folyzoa . — Recorder.] 
General Anatomy and Physiology. 
F. M. Balfour, Comparative Embryology (London : 1880, 8vo), gives, 
at p. 113, a summary, with figures copied from F. E. Schulze, of the chief 
facts which have been determined with regard to the development of 
Sponges. He considers that according to our present knowledge, Sponge- 
larv89 may be divided into two groups : (1) In form of blastosptere, or 
else of a solid morula ; (2) In form of amphiblastula (in Calcarea and 
possibly in some others). The later stages of the development are stated 
