1879.] Hydroid Zoophytes from the Indian Coasts and Seas. 101 
from the anterior nematophore across the lower fifth of the calycle and 
is prolonged into the wall of the pinna. The nematophores are only 
developed in connection with the hydrothecx, they are three in number, 
two lateral and one mesial or anterior ; the lateral are short, tubular, free 
and projecting ; the mesial is long, adnate throughout its entire length, 
except at its immediate extremity, where it is free and slightly projecting. 
Gonosome.—The gonothece arise singly from the posterior aspect 
of the stem near its base, they are bell-shaped and have a circular even 
and somewhat everted margin; the older ones present a more or less 
annulated or ribbed appearance. 
Habitat.—In 35 to 40 fathoms off Cape Comorin, south coast of 
India, and in from 10 to 15 fathoms off Cheduba Island, coast of Arrakan. 
DEsMOScCYPHUS HUMILIS (nov. spec.) 
(Plate IX.) 
Trophosome.—Stems gregarious, not exceeding a quarter of an inch 
in height, straight, simple, erect, divided by joints into a series of short 
internodes, each of which carries a pair of calycles, and rooted by a 
ereeping stolon. The hydrothece are biserial, opposite, urceolate, the 
upper half free and tubular, the lower half adnate and sacciform ; the 
aperture is directed upwards and outwards, and has the margin marked 
by several deep denticulations. 
Gonosome.—The gonothece are broadly tubular or slightly pyriform 
and with a simple margin ; they are opposite, and arise by short pedicles 
on each side in the intervals between the calycles with which they con- 
sequently alternate. - 
Habitat.—Saint George’s Island on the west coast of India, attached 
to sea-weed between high and low water marks. ‘This species is evidently 
referrible to the genus Desmoscyphus of Allman. (Linn. Soc. Journal, 
Vol. XII.) Although many gonangia possess clearly defined peduncles, yet 
at first sight some often appear to be sessile. This difference, however, 
is only apparent, for a closer examination shows that they are all pe- 
dunculated. 
SERTULARELLA RIGOSA (nov. spec ) 
(Plate X.) 
Trophosome.—Stems slender, arising at short intervals from a creep- 
ing filiform stolon, unbranched, zig-zag, and divided by constrictions 
immediately above each calycle into a series of rather lengthened inter- 
nodes each of which supports only one hydrotheca. The hydrothece are 
biserial and alternate, they are broadly tubular, but wider at the base 
13 
