1910.] J. Rrveure: Aydroids of the Indian Museum. 21 
Measurements. 
Hydrocladial internode, length .. ae 0°27 mm. 
Hydrotheca, width of lower portion .. o'10—o'I3 ,, 
5 re Oth =>... bie OVER. he 
Mesial sarcotheca, length rs. OP 7ian 
s et ye DOL thee poRtion! OOSm —- 
Supracalycine sarcotheca, length st Oulrg-t 
LocaALity: Karachi. Specimen from Karachi Museum. 
Reg. No. 8210/9. 
Distribution.—The geographical range of this species is extra- 
ordinarily wide for a form so large—one, therefore, unlikely to be 
transported readily from one locality to another far distant. It 
has been found in the South Pacific Ocean, amongst the Society 
Islands (Tahiti; Jaderholm, 1903). Thence it spreads along the 
east coast of Australia (Pt. Stephens, Pt. Denison, Moreton Bay ; 
Bale, 1884, 1888) through Torres Straits (Kirkpatrick, 1890) to the 
East Indies (Pictet, 1893; Weltner, 1900) and South China Sea 
(Kirchenpauer, 1872). 
In the Indian Ocean it has occurred off Karachi (Jaderholm, 
/.c.; and present record), and off the African coast in the neighbour- 
hood of Madagascar (Billard, 1907 (2)). Ranging thence through 
the Red Sea (Mark.-Turner., 1890 ; Thornely, r908) and the Medi- 
terranean (Mark.-Turn., /.c.) it finally makes its appearance in the 
Atlantic, in the northern portion of which it has been recorded from 
Panama, Jamaica (Nutting, 1900), and Bermuda Islands (Congdon, 
1907), and in the southern from Bahia (Nutting, /.c.). 
Lytocarpus pheniceus (Busk). 
Busk, G., 1852, vol. i, p. 398; as Plumularia phenicea. 
Bale, W. M., 1884, p. 159, pl. xv, figs. I—5 ; pl. xvii, figs. r—4; 
pl. xix, fig. 31; as Aglaophenia phenicea. 
A magnificent example of this species, 19 em. high, with a 
spread of 10 cm., was obtained in deep water off Interview Island. 
The stalk is expanded at the base, and for 10 cm. upwards is desti- 
tute of branches, but, beyond this, luxuriant growth occurs. The 
macroscopic and microscopic structures agree admirably with pre- 
vious descriptions, while of the many forms assumed by this exceed- 
ingly variable species the hydrothece of the specimens before me 
approach most closely those figured by Bale (1884, pl. xv, fig. r) 
from specimens originally described by Busk from Torres Strait. 
They differ, however, in having less pronounced internodal septa, 
and in having the median sarcotheca tilted further upwards, this 
latter feature having been singled out by Marktanner-Turneret- 
scher (1890, p. 276) in specimens from the Indian Ocean. A very 
evident second aperture is present on the superior interior surface 
of the lateral sarcothece. 
