REPORT ON THE TETRACTINELLIDA. 
241 
Spicules. — I. Megascleres. 1. Oxea, fusiform. 2. Dichotrisene. 
II. Microscleres. 3. Sterraster. 4. Oxyaster (?), with slender actines. 5. Micro- 
strongyle. 
Habitat. — Grenada ; depth, 262 fathoms. 
\ 
Erylus transiens (Weltner). 
Stelletta transiens, Weltner, Beitrage zur Kenntniss d. Spong. (Freiburg), p. 44, pi. ii. figs. 
22-25, 1882. 
Sponge. — Conical, 20 mm. long by 10 mm. wide, excavated by an axial cavity, with 
walls 3 mm. in thickness ; or somewhat cylindrical, solid. 
Spicules. — I. Megascleres. 1. Oxea; some of the oxeas traverse the cortex. 2. 
Dichotrisene, deuterocladi short compared to the protocladi ; rhabdome variable in length. 
II. Microscleres, 3. Sterraster, disciform, biconvex, 4. Spheraster, a small centrum 
and numerous conical actines, 0'0162 mm, in diameter. 5. Microstrongyle, fusiform, 
centrotylote ; 0‘05 mm. long. 
Colour. — Pure white in the dried state. 
Habitat. — Barbados; depth, 100 fathoms (Agassiz, 1878) ; and Gulf of Mexico 
(Agassiz, 1879). 
Erylus (f) intermedia (0. Schmidt). 
Stelletta intermedia, 0. Schmidt, Spong. Algier, p. 21, pi. iv. fig. 6, 1868. 
Sponge (?). — Cortex 1 mm. in thickness. 
Spicules. — I. Megascleres, 1. Oxea. 2. Orthotrisene. 
II, Microscleres. 3, Sterraster, spherical; Oil mm. in diameter. 4. Chiaster, actines 
truncated, and covered near the ends with little tubercles. 5. Oxyaster, actines granu- 
Lated. 6. Microxea, surface granulated; 0’075 mm, long. 
Habitat. — Algiers. 
Caminus vulcani, 0. Schmidt. 
Caminus vulcani, 0. Schmidt, Spong. Adriat. Meeres, p. 48, pi. iii. fig. 27 ; pi. iv. fig. 6, 1862. 
Sponge. — Spherical ; surface smooth, covered with a network of elevated ridges ; 
bearing little tubercles ; oscule single, large, situated at the summit of the sponge, sur- 
rounded by a smooth thin margin, leading into a vertically descending cloaca, the upper 
one-third of which is smooth, that below perforated by numerous excurrent canals ; 
pores in sieves between the ridges. Cortex scarcely 21 mm. thick, ectochrote very thin. 
(zooL. CHALL. EXP. — PAKT Lxiii. — 1887.) Rrr 31 
