196 THE VOYAGE OF H.M.S. CHALLENGER. 
Thecopsammia elongata, n. sp. (Pl. XII. figs. 8-10). 
Corallum elongate conical in form, slightly bent and twisted, and here and 
there somewhat constricted ; attached by a narrow base. Epitheca completely covering 
all but a very small portion, of the wall at the margin of the calicle, smooth to the touch 
in surface, with irregular transverse striations, between which it is dotted over with 
minute rounded granular projections (fig. 10). Septa in six systems and four complete 
eycles. Quaternaries larger than the tertiaries. Columella elongate, prominent, spongy 
in structure. 
This coral seems to be by far the largest species of the genus known. The only 
specimen obtained, which was attached to a Balanophyllia, is dead and mutilated. 
I have, however, founded a new species on the strength of it, since it obviously repre- 
sents one. 
Extreme height of the corallum, 42 mm, Extreme breadth of the calicle, 15 mm. 
Station 219, off Nares Bay, Admiralty Islands. 150 fathoms. 
HHeteropsamnua, M.-Edw. and Haime. 
Heteropsamnua michelini, M.-Edw. and H. 
Numerous specimens, containing as usual a small Sipunculid in their base, were 
dredged at 
Station 212. In Basilan Straits, Philippine Islands. Lat. 6° 55’ N., long. 122° 15’ E. 
10 to 20 fathoms. 
ITeteropsammia multilobata, n. sp. (Pl. XII. figs. 1-8). 
Corallum compound, with a broad base more or less heart-shaped in outline, bearing 
from five to seven calicles. Base smooth beneath and flattened, but with a slightly 
curved or undulating surface. At the narrowed end of the base is the large circular 
perforation of the commensal Sipunculid, which inhabits a spiral channel excavated 
within the thickened substance of the base. Edges of the base rounded, smooth. The 
ealicles do not cover the entire basal mass, but leave a wide area of it free all 
round; their walls rise mostly perpendicularly from its upper surface. Along the 
upper margin of the basal mass, beneath the bases of the calicular walls, is a row 
of sharply-defined pores, extending around the entire circumference of the corallum. 
These pores are probably kept open by the Sipunculid for purposes of respiration ; they 
lead to the cavity it occupies (fig. 2). The base is solid beneath and imperforate, slightly 
perforate on its sides, and becomes more and more perforate towards the bases of the cali- 
cular walls, which latter are finely perforate all over. Regular coste absent, but a 
vertical striation is marked more or less all over the sides of the base. Calicles, some 
more or less confluent, some free, multiplying by fission, elongate or irregularly circular 
