72 
Proceedings of the Royal Society 
anterior part. Attached by the extremity of the long narrow stalk. 
Branchial aperture terminal, very prominent, directed anteriorly ; 
atrial on the dorsal edge about half-way down the body, projecting, 
directed anteriorly and dorsally ; both are distinctly four cleft. 
Surface smooth but grooved and creased somewhat. Colour 
yellowish-white with a tinge of red on the stalk. Length (total), 
10-5 cm. ; breadth, 4 cm. 
Test thin but tough. 
Mantle moderately thick, adhering here and there to the test; mus- 
culature close but not strong. 
Branchial sac with four folds on each side. Transverse vessels 
all one size. Internal longitudinal bars numerous. Meshes slightly 
elongated transversely, containing each five or six stigmata. 
Dorsal lamina plain. 
Tentacles long, of a brown colour, twenty-five, all one length. 
Poly carps large ; tentacular endo carps present. 
One specimen from Station 212 (Philippine Islands), 10 to 20 
fathoms. 
Poly car pa irregularis , n. sp. 
External appearance. — Shape irregularly oblong, somewhat pyri- 
form, erect, rather compressed laterally. Anterior and posterior 
ends narrow, middle two-fourths wide, and having the dorsal and 
ventral edges parallel; ventral edge straight throughout, dorsal 
sloping in its anterior and posterior fourths, straight in its central 
two-fourths. Attached by the narrow but irregular posterior end. 
Branchial aperture terminal, prominent, surrounded by four large 
lobes and four small ones ; atrial on the dorsal edge, rather more than 
one quarter of the way down, distinct. Surface very irregular, cut 
up by deep grooves and folds, and partially covered by foreign 
bodies. Colour dirty yellowish- white. Length, 6 cm. ; breadth, 
3*5 cm. 
Test rather thick, tough ; white and glistening on inner surface. 
Mantle thin, musculature not strong. 
Branchial sac with four folds on each side. Three narrow trans- 
verse vessels between each pair of wide ones. About eight internal 
longitudinal bars on the folds and twelve in the interspace. Meshes 
transversely elongated and containing each six stigmata. 
