12 Records of the Indian Museum. [VoL V, 
of the ‘‘ Challenger ’’—from off- Bahia, in Brazil, indicates its 
presence in the Atlantic Ocean. 
Diphasia mutulata (Busk). 
(RI live 3) 
Busk, G:, geese p. 391; as Sertularia mutulata. 
Bale, W. M., 1884, p. Io1, pl. ix, figs. 6—9. 
A few ai specimens of this species were growing on a sponge. 
They are only about Io mm. in height and are unbranched, where- 
as Busk’s type was 3 inches high and bore irregular branches ; but 
the minute structure corresponds with Busk’s rather meagre des- 
cription. The colonies, which are of delicate texture, are faintly 
tinged with brown. ‘The hydrothece are in pairs, sub-opposite on 
the proximal portion, but on the same level in the distal part of a 
colony. Occasionally too, nodes, though indistinguishable at the 
base of a specimen, are discer nible towards its tip. The hydrotheceze 
are deep and narrow; their distal free portion projects at right 
angles to the stem, its length being equal to about 4+ that of the 
adnate portion. The aperture faces upwards and sliehiths outwards, 
is elliptical in shape, broader than deep, bounded on the adcauline 
side by a straight margin, on the abcauline by a gentle curve. An 
operculum is present, hinged to a thickening of perisare on the free 
edge of the adcauline wall. Within the hydrotheca is a prominent 
intrathecal ridge, projecting from the mid portion of the abcauline 
wall and curving strongly upwards. ‘The lateral portions of this 
partition cau be traced for a considerable distance along the walls 
of the hydrotheca, but its general limit is strongly defined by a 
thickened edge. 
No gonosome was present. 
Measurements. 
Hydrotheca, length of free portion ! .. O'I5—O'2I mm. 
ie , -adnate portion .- 0°45—0'52:. ,, 
a diameter orairee portion... O20 ue 
by. Fé adnate portion OoNOTmi rE. 
is breadth of aperture from 
side to side a fe O27 as 
Distance between hydrothece .. .. O'08—O'!I4 ,, 
Locality : Growing on a sponge from the Andaman Islands, 
1899 ; depth (2?) 490 or 60 fathoms. 
Distribution.—Previously recorded from ‘Torres Straits (Busk, 
1852) ; Port Molle (Bale, 1884) ; off Galle, off Negombo, and in the 
Gulf of Manaar (Thornely, 1904); Suez docks and Suez Bay 
(Thornely, 1908). 
! Measured along adcauline wall. 
