18 Records of the Indian Museum. [Verve 
those second from the anterior tooth are somewhat larger than the 
others. The mesial sarcotheca is large, adnate for more than half 
the height of the hydrotheca, but with a scoop-shaped extremity 
free. The supracalycine sarcothecee are very large, reach just 
above the margin of the hydrotheca, and possess a huge aperture. 
They are cylindrical in shape but for a constriction about midway, 
which is associated with an internal ridge traversing part of their 
cavity from the posterior wall. 
The intrathecal ridge is little evident. Where present it is 
short, and projects into the lumen of the hydrotheca from a knob 
of chitin which terminates an angular in-bending of the posterior 
wall, situated a short distance above the floor of the cavity. The 
bases of the two sides of the angle are marked by well-defined ridges 
projecting from the posterior of the hydrotheca into the cavity of 
the internode, while a third posterior ridge arises just above the 
bases of the supracalycine sarcothecee. Another shorter ridge 
projects backwards into the proximal portion of the internode from 
its anterior wall. Two important and _ characteristic chitinous 
thickenings are associated with the mesial nematophore: one is a 
simple knob, projecting forwards from the hydrotheca wall into 
the nematophore cavity near its mid point, the other is a sinuous 
septum traversing the base of the sarcotheca and isolating its cavity 
from that of the internode, except for a small opening through 
which the sarcostyle passes. Occasionally from the convex surface 
of this hook-like septum a small chitinous ridge projects backwards 
(see lower hydrotheca, pl. iv, fig. 9). 
Two large scoop- shaped sarcothecee lie on the hydroclade-bear- 
ing tube at the base of each hydroclade, one proximal to the process 
on which the hydroclade rests, the other supero-lateral, on the side 
of the process which faces inwards. The process itself bears 
a small, anterior, tubular sarcotheca. 
Gonosome.—A few structures, apparently phylactocarps, are 
present, although unfortunately they are immature, or have lost 
their gonangia. They replace hydroclades on the lower portion 
of the stem, and are obviously morphological modifications of 
these, for they are divided into internodes each of which bears three 
regularly-arranged, scoop-shaped sarcothecee—one median and 
proximal, the others lateral and distal, in a pair (pl. iv, fig. 10). 
Each internode corresponds to a thecate internode, without the 
hydrotheca. No hydrotheca occurs on the proximal internode of 
the phylactocarp. No gonangia are present, but, as in other species, 
they no doubt assume the positions of the missing hydrothece. 
Measurements. 
Hydroclade-bearing tube, diameter .. 0°21 mm. 
Hydrocladial internode, length it AOBS sti, 
Hydrotheca, depth .. Vee ORO aiys 
diameter at mouth i nO2e 
Phylactocarp, length of internodes .. 0°27 
