412 G. HERBERT FOWLER. 
mens, and zooxanthelle are present in the cclenteron in large 
numbers. 
For a figure! and description of the genus, see Milne-Edwards, 
‘Hist. Nat. Corall.,’ ii, p. 223, pl. v2, fig. 2a. 
HETEROPSAMMIA MULTILOBATA. 
For some material of this beautiful Eupsammid coral, I am 
again indebted to the kindness of Professor Moseley, whose 
generosity I can never sufficiently acknowledge. 
This particular species is colonial; the body of the corallum 
(of which a fine specimen, now in the British Museum, is drawn 
in Professor Moseley’s ‘ Report on the Deep Sea Corals,’ pl. 
xli, figs. 1—8), is in the shape of a broad pear, of which the 
lower or resting surface is somewhat flattened, while from the 
upper side spring the calicles of the polyps. Where the stalk 
of the pear should be, is a large pore (fig. 5) leading into a 
spiral chamber in the centre of the corallum (fig. 6), which is 
inhabited by a commensal Sipunculid worm, and into which 
smaller pores round the bases of the calicles also open. As to 
the origin of this spiral chamber, there exists considerable dif- 
ference of opinion; Milne-Edwards, by whom the genus was 
originally founded (‘ Hist. Nat. Zool.,’ i, p. 105), believed 
that it represented the cavity of a Gastropodan shell, on which 
the embryo coral had settled and which the latter had finally 
overgrown ; Semper, on the other hand (‘ Zeit. wiss. Zool.,’ 
xxii, and ‘Animal Life,’ Intern. Sci. Series, p. 334, et seq.), 
denies this, but cannot be said to adduce definite evidence 
to the contrary. Inthe absence of such direct experimental 
evidence, analogy points very strongly to the probability that 
Milne-Edwards was in the right. 
There are two other (I believe, only two other) genera of 
Madreporaria possessing the very characteristic form of Hetero- 
psammia (i.e. the pear-shaped body, &c.), namely Stephanoseris 
and Heterocyathus; in the centre of both occurs the spiral 
1 A diagrammatic figure of the general anatomy will be found in Dr. S. J. 
Hickson’s forthcoming work on the Celebes group. 
