77 
of Edinburgh, Session 1880-81. 
Test not very thick, and not tough, but very stiff, like cardboard ; 
white on section and on the inner surface. 
Mantle thin and closely adhering to the test, musculature feeble. 
Branchial sac with four folds on each side. Tranverse vessels all 
one size. About twelve internal longitudinal bars on the folds, and 
six on the interspace. Meshes transversely elongated, and con- 
taining twelve stigmata each. 
Dorsal lamina narrow, plain; edge even. 
Tentacles simple, close, crowded, stout, about forty, all one length. 
Olfactory tubercle oblong, lying in a very large triangular peri- 
tubercular area, and directed forwards and to the left. 
Polycarps deeply imbedded in the mantle. Intestinal loop very 
wide. 
Two specimens from Station 162 (Bass’ Straits), 38 to 40 
fathoms. 
Poly car pa longisiplionica , n. sp. 
External appearance . — Shape oblong or somewhat flask-shaped, 
erect, posterior end large and rounded, anterior end narrow and 
pointed. Apparently not attached, or only slightly by the posterior 
third of the left side. Apertures conspicuous, at the ends of very 
long siphons ; branchial terminal, directed anteriorly ; atrial on the 
dorsal edge half-way down, directed dorsally and anteriorly, fully 
as long as the branchial siphon. Surface covered, except on the 
siphons, by a fine coating of sand and shell fragments. Colour 
dark-brown. Length, 7 cm. ; breadth, 4 cm. 
Test thin and brittle, but rather stiff. 
Mantle thin, closely adhering to the test ; musculature feeble. 
Branchial sac with four folds on each side. Every fifth or 
sixth transverse vessel wider than the intermediate ones, which are 
all one size. Eight internal longitudinal bars on the folds, and 
about the same number on the interspace. Meshes square, 
occasionally divided by a narrow horizontal membrane, containing 
each four to six stigmata. 
Dorsal lamina narrow and plain edged. 
Tentacles not very long, rather distant, about eighteen, some 
shorter than others, but not placed alternately. 
Olfactory tubercle circular in outline. 
VOL. xi. 
L 
