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Proceedings of the Boy at Society 
its transverse axis directed anteriorly and posteriorly, the opening 
being at the right side ; both horns turned in and forming moder- 
ately large spirals. 
Viscera — (Esophageal opening very far forwards in the branchial, 
sac. 
One specimen from Port Jackson, 6 to 15 fathoms. 
Cynthia fissa , n. sp. 
External appearance. — Shape ovate, with a deep cleft at the 
anterior end of the dorsal edge extending nearly half-way down, 
slightly flattened laterally ; attached by the posterior end and 
nearly the posterior half of the left side. Apertures prominent, at 
the extremities of the two projections formed by the cleft ; bran- 
chial projection terminal, atrial on the dorsal edge, fully half-way 
down, not so long as the branchial. Surface very irregular, much 
wrinkled and rough; on the right side the chief wrinkles run 
transversely. Colour yellowish-brown. Length, 2 cm. ; breadth, 
1*6 cm. 
Test strong and stiff : white on the inner surface. 
Mantle thick. 
Branchial sac with six folds on each side. Six internal longi- 
tudinal bars on a fold, and three in the interspace. Meshes con- 
taining each six to eight stigmata, and sometimes divided by a 
narrow horizontal membrane. 
Dorsal lamina with tentacular languets. 
Tentacles simply pinnate, about twelve in number. 
Olfactory tubercle large, irregularly oblong, aperture anterior ; 
both horns turned to the left. 
Several specimens adhering to the test of Microcosmus poly- 
morphus , from Station 162 (Bass’ Strait), 38 to 40 fathoms. 
Cynthia formosa , n. sp. 
External appearance. — Composed of a spherical body and a 
narrow stalk. Posterior end of the body rounded, anterior rather 
flatter; dorsal edge slightly more convex than ventral. Stalk 
about as long as the body, twisted, narrow, expanding slightly at the 
lower end where it is attached. Apertures both at the anterior end, 
