REPORT ON THE TETRACTINELLIDA. 
247 
Geodia barretti, var. nodastrella, Carter. 
Geodia nodastrella, Carter, Ann. and Mag. Nat. Hist., ser. 4, vol. xviii. p. 397, pi. xvi. fig. 45, 
1876. 
Sponge. — Spherical when young, irregularly tuberose when large ; free or attached ; 
oscules the patent openings of shallow cloacas having cribriform walls ; pores in sieves, 
small, 0’0276 to 0 055 mm. in diameter, generally distributed ; cortex 0'607 mm. in thick- 
ness. Ectochrote containing spherasters and traversed by cortical oxeas ; the somal oxeas 
frequently pierce the cortex. 
Spicules. — I. Megascleres. 1. Somal oxea, 2 ‘6 8 by 0‘07 mm. 2. Cortical oxea, 0'31 
by 0’007 mm. 3. Dichotrisene, rhabdome 2’39 by 0'112 mm., chord 0756 mm. long. 
4. Ana- and 5. Pro-trisene, cladi about 0‘127 mm. in length. 
II. Microscleres. 6. Sterraster, spherical or ellipsoidal. O' 10 mm. in diameter. 7. 
Somal spheraster, actines reduced to rounded tubercles, 0‘0085 mm. in diameter. 
8. Choanosomal oxyaster, with conical actines, 0'0127 mm. in diameter. 
Colour. — Y ello wish-white. 
Habitat. — In deep water between the north of Scotland, the north-west of Shetland, 
and the Fseroe Islands; Stations 51, 57, 61-63, and 65, “Porcupine” expedition, 1869; 
and near Cape St. Vincent. 
Geodia carteri, n. sp. 
Geodia canaliculata, Carter, Ann. and Mag. Nat. Hist., ser. 5, vol. xi. p. 346, pi. xiv. fig. 1, 
1883. 
Sponge. — Subspherical, oscules in scattered groups ; cortex thick. 
Spicules. — I. Megascleres. 1. Somal oxea, 2‘8 by 0'053 mm. 2. Cortical oxea, 
0'25 mm. in length. 3. Dichotrisene, rhabdome 2'667 by 0'067 mm., chord 0’684 mm. 
4. Anatrisene, cladi 0'112 mm., chord 014 mm. long. 
II. Microscleres. 5. Sterraster, spherical, 0'078 mm. in diameter, 6. Spheraster, 
centrum large, actines short, cylindrical, spined at the edges of the truncate ends, 0'034 
mm. in diameter. 7. Chiaster, 0'0042 mm. in diameter. 
Colour. — Light fawn colour. Size, 75 mm. in diameter. 
Habitat. — Adelaide, south-west of Australia. 
Remarks. — This account is drawn up from Carter’s description and figures (Zoc. cit.). 
The species appears to be similar to Schmidt’s Geodia canaliculata, but there is not suffi- 
cient evidence of their identity, and I propose to direct attention to this fact by naming 
the present sponge anew, after its describer. 
