1915.] A. Oxa: The Tunicata of the Indian Museum. 19 
arranged thus: I, 3, 2, 3,1... The meshes are broader than long and contain each 
about seven stigmata. 
The dorsal tubercle is broadly crescentic in shape, placed transversely with the 
concavity turned forwards. 
The dorsal lamina is a narrow plain membrane. 
The alimentary canal forms a short close loop with a distinct stomach. The 
intestine is rather wide, and the wall of the stomach is ridged longitudinally. The 
anus has a finely toothed margin. 
The gonads consist of about a dozen roundish polycarps on each side, all 
embedded in the thickness of the wall. 
The most important point of difference between the present specimen and the 
description of Styela glebosa by Sluiter is in the shape of the dorsal tubercle which 
is a transverse slit with irregularly indented lips in the type specimens. Another 
point of difference is that in our specimen the ‘‘ziemlich regelmässig verbreitete 
runde Piinktchen”’ on the outside of the mantle are not found. There are also 
differences in the number of tentacles and of the internal longitudinal bars on the 
folds of the branchial sac, but they are not considerable. 
Polycarpa annandalei, n. sp. 
(Ply fie. 12; ply HI, fies: 39) 
External Appearance.—The body is somewhat quadrate in shape, with the aper- 
tures on two equal projections at the dorsal and ventral edges of the anterior end, 
giving the latter a cleft appearance (Pl. I, fig. 12). The siphons are bent towards 
the ventral and dorsal sides respectively. The surface is corrugated and encrusted 
with sand grains and shell fragments all over, and is of a yellowish-brown colour on 
account of the sand. It is 33 mm. long, 23 mm. broad, and 19 mm. thick, and the 
apertures are 38 mm. distant from each other. The apertures are both cross slit. 
The Test is thin, hard, and stiff, and is whitish with pearly lustre on the inside. 
In section it is seen that the sand grains are embedded in, as well as attached to, 
the test. Some of the sand grains even project inwards forming little prominences 
on the inner surface of the test. 
The Mantle is exceedingly thin and colourless, and contains an irregular network 
of fine muscle fibres. 
The Tentacles are of three sizes ; there are about twelve large, twelve smaller, 
and a number of still smaller ones arranged regularly, though not throughout, after 
the scheme I, 3, 2,3, I... They are finger-like in shape, with the tips rather blunt 
(PLIS SS 5): 
The Branchial Sac has four narrow folds upon each side. There are seven to 
fourteen internal longitudinal bars on a fold and five to nine in the interspace. The 
transverse vessels are of two sizes, for the most part placed large and small alter- 
nately, but in some places every fourth vessel is larger than the intermediate ones. 
The meshes are nearly square and contain three to four stigmata each (Pl. III, 
