102 
THE YOYAGE OF H.M.S. CHALLENGER. 
Triptolemus intextus (Carter). 
Pacliastrella intexta, Carter, Ann. and Mag. Nat. Hist., ser. 4, vol. xviii. p. 409, pi. xv. fig. 41, 
1876. 
Samus {?) intextus, Carter, Ann. and Mag. Nat. Hist., ser. 5, vol. vi. p. 60, 1880. 
Sponge. — Incrusting on a fragment of Corallistes howerhankii, Johnst. 
Spicules. — I. Megascleres. 1. Oxea comparatively long (dimensions not ascer- 
tained). 2. Mesotrisene, actines conical, pointed ; cladi dicliocladose or tricliocladose ; 
0'186 mm. “in total diameter” (Carter). 
II. Microscleres. 3. Microxea bearing blunt spines of different lengths, 0’021 mm. 
long. 4. Amphiaster, O'Ol mm. long. 
Distribution. — Station 25 of the “ Porcupine ’’ Expedition ; a few miles north of Cape 
St. Vincent; depth, 374 fathoms. 
Triptolemus parasiticus (Carter). 
Pacliastrella parasitica, Carter, Ann. and Mag. Nat. Hist., ser. 4, vol. xviii. p. 410, pi. xvi. fig. 
50, 1876. 
Samus parasiticus. Carter, Ann. and Mag. Nat. Hist., ser. 5, vol. vi. p. 60, 1880. 
Sponge. — Incrusting (found on a specimen of Polytrema utHculare). 
Spicules. — I. Megascleres. 1. Oxea, 0‘38 by 0’016 mm. 2. Mesotrisene, rhabdome 
with conical pointed actines, actines thrice bifurcate, protocladus 0'06 mm. long ; deutero- 
and trito-cladi having together about the same length as the protocladus. 
II. Microscleres. 3. Microxea, slightly undulating, thickly beset with minute spines, 
0 024 mm. long. 4. Amphiaster, 0‘012 mm. long. 
Habitat. — Unknown. 
Observation. — The dimensions of the spicules were obtained by direct measurement of 
Carter’s figures, which are drawn to scale. 
Genus 6. Stoeba,'^ n. gen. 
Theneidse in which the skeleton consists of dichotrisenes, and spined microxeas like 
those of Triptolemus. 
Stoeba simplex (Carter). 
Samus simplex. Carter, Ann. and Mag. Nat. Hist., ser. 5, vol. vi. p. 60, pi. v. fig. 26, 1880. 
Sponge. — Excavating. 
Spicules. — I. Megasclere. 1. Dichotrisene, rhabdome 0'21 by 0‘042 mm. 
^ aroilii], ij, a stuffing, filling up. 
