1867.] DR. J. E. GRAY ON SPONGES. 537 



end. 2. Needle-shaped, conical, strongly spined all over. 3. Equi- 

 anchorate, bi- or tridentate. 4. Bihamate. 



Hymedesmia zetlandica, Eowerb. B. S. i. ji. 190, ii. p. 152, 

 f. 296, 371. 



18. Tereus. 



Sponge massive, sessile, smooth, regularly reticulated, with a 

 square mesh. Skin spiculose. Spicules of two kinds: — 1. Needle- 

 shaped, thick, spinulate all over. 2. Equibianchorate, two-spined, 

 two-fringed, of various sizes. 



Tereus fimbriatus. 



Isodictya fimhriaf.a, Bowerb. ib. ii. p. 337, f. 150; O. Schmidt, 

 Supp. ii. t. 1. f. 18. 



19. Carmia. 



Sponge-coating thin, smooth. Oscules dispersed. Skin spiculose. 

 Spicules of four kinds: — 1. Subclavate, needle-like, and very slender. 

 2. Fusiform, tricurvate. 3. InequianchoratCj bideutate, or subpal- 

 mate. 4. Bihamate, contorted. 



1. Carmia macilenta. 



Hymeniacidon macilenta, Bowerb. B. S. ii. p. 176. 



2. Carmia florea. 



Hymeniacidon Jloreum, Bowerb. ib. ii. p. 190. 



** Flukes oblong, concave, of rather unequal length, with a single 

 central apical tubercle at each end. 



20. CORYBAS. 



Sponge-coating lobate or branched, regularly reticulated externally. 

 Skin spiculose. Oscules dispersed. Spicules: — 1. Needle-shaped, 

 short, and stout. 2. Needle-shaped, subcyhndrical, slender. 3. Bi- 

 hamate, extra-unibonate. 4. Equiauchorate ; flukes oblong, concave, 

 with a single central apical tubercle at each end (Bowerb. f. 139). 



CoR\'BAS LOBATA. 



Isodictya lobata, Bowerb. B. S. ii. p. 326, f. 139. 



*** Flukes cup-shaped, acute on each side. 

 21. Ingallia. 



Sponge 1 Spicules: — 1. Equiauchorate, with a hemispinal 



cup at each end, abundant, recumbent on the membranes. 



Ingallia cupulifera. 



Desmacidon, sp., Bowerb. B. S. i. p. 252, f. 151. 

 Hab. ? 



