PROF. THOMSON AND MR. McQUEEN—REPORT ON THE ALCYONARIANS. 55 
Locality.—Off south-east corner of Shubuk, at a depth of 9 fathoms, on 
a bottom of coarse sand, shells, and coral. Previously recorded from the 
Maldives. 
SCLEROPHYTUM DENSUM ( Whitelegge). 
= Lobophytum densum, Whitelegge. 
See Th. Whitelegge, “‘The Alcyonaria of Funafuti,’ Mem. Australian Mus. 1897, 
p. 219, pl. xi. figs. 4a-4h. 
See E. M. Pratt, 1903, doc. cit. p. 52], pl. xxix. fig. 18, pl. xxx. figs. 20-22. 
This species is represented by two very hard and brittle colonies. The 
trunk of one colony is 7°5 cm. broad and 5°8 cm. high. It passes almost 
imperceptibly into numerous finger-like processes. What we have observed 
in these specimens corresponds closely with Miss Pratt’s figures (Alcyonaria 
of the Maldives, 1903). . 
Whitelegge (1897) has classified the spicules very minutely, and his 
subdivisions have been followed in taking the following measurements of 
leneth and breadth in millimetres :— 
i. Large fusiform, with simple spine-like tubercles and usually with a 
transverse median constriction : 2°5 0:5 ; 21x04; 2x04. 
ii. Large fusiform, subcylindrical or subclavate, closely tuberculate, 
the tubercles being thickly studded with minute spiny warts : 
31x05 3 2°7xX0°5; 23x 0°45; 19x 04. 
iii. Smaller fusiform, strongly but distantly tuberculate: 0°75 x 0°25 ; 
0°6 x 0°2. 
iv. Small fusiform, comparatively smooth, but with some spines: 
1xX0:18; 0°48 x 0-1. 
v. Spindles: 0°22 x 0:04 ; 0°19 x 0:04 ; 0:17 x 0:03 ; 0°06 x 0°03. 
vi. Clubs: 0°12 x 0°04 ; 0°08 x 0:04. 
The colour of the colony in spirit is pale yellow ; when living it was 
bluish-grey. 
Locality—Forms great sheets in about four feet of water in Suakim 
Archipelago (Tella Tella Seghir Island). Previously recorded from 
‘Funafuti, China Seas, British New Guinea, the Maldives. 
LiTHOPHYTUM ARBOREUM, Forskal. 
For descriptions, see W. May (1899), doc. cit. p. 134, and W. Kiukenthal, ‘ Versuch 
einer Revision der Alcyonarien. II. Die Nephthyiden, 1 Teil,’ Zool. Jahrb. 
1903, p. 124. 
A large number of specimens are referable to this species. There is 
considerable variety as regards the dimensions of the spicules, and some 
forms approach L. stwhlmanna. 
One of the largest specimens consists of a common basis 7 em. in breadth, 
from which six branches take origin. These bear secondary branches on 
