254 
THE VOYAGE OF H.M.S. CHALLENGER. 
Geodia (?) thompsoni, 0. Schmidt. 
Geodia thompsoni, 0. Schmidt, Spong. Atlant. Gehiet., p. 70, pi. vi. fig. 13, 1870. 
Sponge (?). — Surface smooth. 
Spicules. — I. Megascleres. 1. Oocea, 3 ’37 by 0'05 mm. 2. Dichotnaene, rhabdome 
0*095 mm. in diameter, protocladi 0*213 by 0*095 mm., deuterocladi 0*416 by 0*07 mm. 
II. Microscleres. 3. Sterraster, ellipsoidal, 0*178 by 0*142 mm. 4. Other Asters (?). 
Habitat. — Cozera, Cuba ; depth, 270 fathoms. 
Remarks. — Such measurements as I could obtain from Schmidt’s type-sbde in the 
British Museum are given above. As to Schmidt’s description, one must be content in 
saying that it is inadequate. 
Geodia (?) canaliculata, 0. Schmidt, 
Geodia canalieulata, 0. Schmidt, Spong. Algier., p. 21, pi. iv. fig. 7, 1868, 
(i) Not Geodia canaliculata, Carter, see Geodia carteri, p. 247, antea. 
Sponge {?). — No description given by the author. 
Spicules. — I. Megascleres, 1. Oxea, 2*13 by 0*044 mm. 2. Trisene (?), no descrip- 
tion given beyond the fact that it is subject to pathological variations. 
II. Microscleres. 3. Sterraster, spherical, 0*057 mm. in diameter; 0*0385 mm. (0. 
Schmidt, loc. cit., p. 21), 4. Aster, 0*025 mm, in diameter. 
Habitat. — Algiers. 
Remarks. — The type-slide in the British Museum, presented by Schmidt, does uot 
contain a full complement of spicules ; of those present measurements are given above. 
Genus Cydonium, Fleming. 
Cydonium mulleri, Fleming, 
Alcyonium cydonium, Muller, Zool. Dan., vol. iii. pi. Ixxxi. figs. 3, 4, 5a. 
„ „ Jameson, Mem. Wern. Soc. Edin., vol. i. p. 563. 
Cydonium mulleri, Fleming, British Animals, p. 516, 1828. 
Geodia zetlandica, Johnston, Hist. Brit. Sponges, p. 195, pi. iii. figs. 3, 4, 1842. 
„ „ Bowerhank, Mon. Brit. Spong., vol. ii. p. 45, 1866 ; vol. iii. p. 15, pi, vil, 1874. 
„ „ Norman, Bowerhank, Mon. Brit. Spong., vol. iv. p. 27, 1882. 
Cydonium mulleri. Gray, Proc. Zool. Soc. Lond., pp. 127, 492, 1867. 
Cydonium zetlandicum, Sollas, Ann. and Mag. Nat. Hist., ser. 5, vol. v. p. 241, 1880. 
Cydonium miiTleri, Vosmaer, Bronn’s Thierreich, Porifera, p. 317, 1887. 
Sponge . — More or less cylindrical, cup-shaped, or massive, ellipsoidal. Surface both 
minutely and strongly hispid. Cortex 0*96 mm. in thickness, chiefly constituted of the 
sterrastral layer. 
