1gto.]| J. RircuHiE: Hydroids of the Indian Museum. 9 
LOcALity : Growing on the spine of a Cidarid Sea-Urchin 
dredged from Station 358 of the R.I.M.S. ‘‘ Investigator,’’ lat. 
15° 55 30° N., long. 52° 38’ 30” E. (Arabian Sea, near the Gulf of 
Aden) ; depth 585 fathoms. —_. 
Distribution.—(See Hartlaub, 1905, p. 594.) A species of 
world-wide range recorded:trom the North Pacific (Marktanner- 
Turneretscher, 1890; Nutting, 1899; Torrey, 1902); the North 
Atlantic Ocean (Hincks, 1868, etc.); the South Atlantic Ocean 
(Allman, 1888; Hartlaub, 1905 ; Jaderholm, 1905 ; Ritchie, 1907 (1) ); 
the Arctic Ocean (Bergh, 1887); the Antarctic Ocean (Ritchie, 
1909 (I) ) ; South Australia (Bale, 1884). The species has not hitherto 
been recorded from Indian seas. 
Lajoéa serrata, Clarke. 
Clarke, S. F., 1879, p. 242, pl. iv, fig. 25. 
Hactlaub, ©. 1905, p.. 505. he. O*. 
Represented in the collection by only a few specimens which 
agree in dimensions with the typical examples recorded by Billard 
from the coasts of Spain. 
Measurements. 
Hydrotheca, length of adnate portion .. 0°22—0'27 mm. 
c' ge free a 0725-—0:29, ©. 
bs diameter at mouth .. 2., 0°003—0:077 ,, 
Locanity: Creeping on Sertularella polyzonias var. cornuta, 
from 8 miles west of Interview Island, Andaman Islands ; depth 
270—45 fathoms. 
Distribution.—A widely distributed species recorded from the 
east and west sides of the North Atlantic (Billard, 1907 (1); Clarke, 
1879) ; from the Straits of Magellan (Hartlaub, 1905); and from 
the Indian Ocean (Zanzibar, Billard, 1907; Gulf of Manaar, 
Thornely, 1904 ; Andamans, present record). 
Family SERTUI,ARIDA. 
Cryptolaria operculata, Nutting. 
Nutting, C. C., 1905, p. 947, pl. iii, fig. 4 5-pl. x, 12—14. 
Colonies of this species much more complete than those found 
by Professor Nutting occur in the collection. Although now some- 
what broken, the largest colony when pieced together reaches a 
height of about 20cm. It has a thick fascicled stem, 3 mm. in 
diameter at the base, of a pale brown colour, and terminating in a 
flattened basal expansion. From the stem arise strongly fascicled, 
gnarled branches (2 mm. in diameter), which bear off-shoots to the 
fifth or sixth degree. Although they lie roughly in one plane, 
little regularity pervades the arrangement or structure of the 
