73 
of Edinburgh, S ession 1880-81. 
Dorsal lamina narrow and smooth. 
Tentacles linear, rather distant, twenty-four in number, coloured 
black, some rather smaller than others but not placed alternately. 
Olfactory tubercle ovate, but with the narrow end placed pos- 
teriorly, much convoluted and marked with black. Intestinal loop 
wide. 
Endocarps numerous, yellow, and rather small. 
One specimen from Station 208 (Philippine Islands), 18 fathoms. 
Polycarpa sulcata , n. sp. 
External appearance. — Shape between ovate and pyramidal, not 
compressed ; anterior end narrow but rounded, posterior end broad 
and rounded ; ventral edge very convex, dorsal convex posteriorly 
and concave anteriorly. Attached by the posterior end of the ven- 
tral edge. Branchial aperture not terminal but twisted round to 
the dorsal edge, prominent, directed dorsally ; atrial on the dorsal 
edge about half-way down, directed dorsally ; both four-lobed, wide 
and conspicuous. Surface smooth but uneven, cut up by deep 
creases and folds into rounded pad-like projections. Colour dull 
creamy- white. Length, 5*5 cm. • breadth, 3*5 cm. 
Test thick and tough but soft, not stiff. Inner surface white, 
with small dark dots over it. 
Mantle thin, not adhering to the test, dark brown; musculature 
not strong. 
Branchial sac with four narrow folds on each side. Three 
narrow transverse vessels between each pair of wide ones. In- 
ternal longitudinal bars few. Meshes transversely elongated, con- 
taining each about eight stigmata. 
Dorsal lamina smooth, very narrow. 
Tentacles, twelve, rather large but not very long, distant, with 
two or three very minute ones between each. 
Olfactory tubercle large and irregular, spongy. 
Three specimens from Banda, 17 fathoms. 
Polycarpa pilella, n. sp. 
External appearance. — Shape a little variable but generally 
spherical or ellipsoidal, occasionally rather pyriform, the posterior 
