REPOET ON THE TETRACTINELLIDA. 
203 
Species Insufficiently Characterised. 
Myriastra (f) or Anthastra{?) tethyopsis (Carter). 
Stelletta tethyopsis. Carter, Ann. and Mag. Nat. Hist., vol. vi. p. 491, pi. vi. figs. 39, 40, 1880. 
Sponge. — Somewhat spherical and free, or hemispherical and sessile, surface hispid by- 
projection of trisenes. Oscules(?). Cortex (?). 
Spicules. — I. Megascleres. 1. Oxea, fusiform, 8‘68 by 0 “05 6 mm. 2. Dichotrixne, 
rhabdome 8“68 by 0“07 mm., chord 0*42 mm. 3. Protrixne, hispidating, 4. Anatrisme, 
hispidating. 
II. Microscleres. 5. Chiaster, 0“0042 mm. in diameter. 6. Chiaster, 0*0 162 mm. 
in diameter. 
Colour. — Grey. 
Habitat. — Gulf of Manaar. 
Stelletta (?) profunditatis, 0. Schmidt, 
Stelletta profunditatis, 0, Schmidt, Spong. Mexico, p. 70, 1880. 
Sponge. — Bolster shape, 10 mm. in diameter, 5 mm. high. 
Spicules. — I. Megascleres, 1. Rhahdus, either oxeate, strongyloxeate, or tylot- 
oxeate. 2, Dichotrixne, with slender, widely divergent cladi. 
IL Microsclere. 3. Oxyaster, with four to seven slender actines. 
Habitat. — Lat, 24° 33' N., long. 84° 23' W. ; depth, 1920 fathoms. 
Ecionema (?) pygmxorum (0. Schmidt), 
Stelletta pygmxorum, 0. Schmidt, Spong. Mexico, p. 70, pL ix. fig. 9, 1880. 
Sponge. — Eesembling an irregular crooked stem of a plant, with a club-like upper 
portion, circular in transverse section. 
Spicules. — I, Megascleres. 1. Oxea, sharply or obtusely pointed, 2. Orthotrixnes 
and Dichotrixnes, cladi irregular in form and frequently reduced to tubercles. 
II. Microscleres, 3. Microstrongyle. 4. Aster, 0'0028 to 0'005 8 mm. in diameter. 
The microscleres form a cortical layer. 
Habitat. — St. Vincent; depth, 95 fathoms. 
AncorinaiJ) tripodaria, 0. Schmidt. 
Ancorina tripodaria, 0. Schmidt, Spong. Adriat. Meer., SuppL, iii. p. 18, pi. iii. fig. 10, 1868. 
Sponge. — Half the size of a hand, with a thick cortex. 
Spicules. — I. Megascleres. 1. Oxea, slender, with a roughened surface. 2. Oxea, 
smooth, straight, or bent. 3. Plagiotrixne, rhabdome comparatively short ; cladi long, 
