196 THE VOYAGE OF H.M.S. CHALLENGER. 



Thecopsammia elongata, n. sp. (PI. 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 gi-anular projections (fig. 10). Septa in sis systems and four complete 

 cycles. 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 

 s]3ecimen 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. 



Heteropsammia, M.-Edw. and Haime. 



Heteropsammia 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. 



Heteropsammia multilobata, n. sp. (PI. XII. figs. 1-3). 



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 

 calicles 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. Eegular costae 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 



