rgto.| J. Rrren1e: Hydroids of the Indian Museum. II 
that of var. vobusta, Kirchenpauer (1884), from the Cape of Good 
Hope. 
The gonangia are characteristic. While they have the elongate- 
ovate shape and the strong corrugations of typical specimens, they 
are surmounted by four stout spines lying cross-wise, in a plane at 
right angles to the long axis of the gonangium. ‘This character has 
given its designation to the variety. 
Measurements. 
Hvdrotheca, length of adnate portion .. 0°25—0'39 mm. 
fe . free portion 10 25-0 20. 
= greatest diameter .. .. 0'22—0'28 ,, 
ts diameter at mouth .. ae OT FZ-—0'°204-4 
Gonangium, length ag se - eee 
+ greatest diameter .. iv O:50 
+>”) 
length of ‘* horns 0°22 
>) 
LOCALITIES: (a) Andaman Islands; depth 490 fathoms; Reg. 
No. 64/7 ; (b) 8 miles west of Interview Island, Andaman Islands ; 
depth 270—45 fathoms. 
Type in the Indian Museum, Calcutta. 
Distribution.—W orld-wide, but although the species has been 
recorded from the Red Sea (Kirchenp., 1884), from off Australia 
(Bale, 1884), and from Natal (Warren, 1908), it has not hitherto 
been found in Indian seas. 
Idia pristis, Lamouroux. 
PAmourouxs -j.0 Nik IOrO<p- 200, pl. v,-fig.. 5% 
Allman, J. G., 1888, p. 85, pl. xxxix. 
A clump of many colonies—the larger about 7 cm. high—alone 
represents this species. The clump is the centre of a life-associa- 
tion of much variety: about the base were corallines, and coral 
skeletons; intertwined with the hydroid stems were at least two 
species of Alcyonarians ; while over the colonies themselves meander 
a creeping Polyzoon and a hydroid recorded above,—Campanularia 
corrugata. 
My observations as to the structure of polyp and hydrocaulus 
confirm those of Billard (1907, p. 351), for, contrary to Allman’s 
description (1888, p. 86), I can find no trace of an interior chamber 
containing a diverticulum of the base of the polyp. 
Locatity : Collected by the R.I.M.S. “‘ Investigator ’’ at Sta- 
tion 312, lat. 16° 56’ 15” N., long. 92° 35’ 00” E., off Lower Burma; 
depth 1,343 fathoms. 
Distribution.—The records of this species have been recently 
brought together by Billard (1907, p. 352). Its centre of distribu- 
tion appears to be in the Indo-Pacific region, for it has been found 
on the east coast of Australia, among the East Indies, off the 
Malay Peninsula, and in the Indian Ocean. A solitary record—that 
