472 
Proceedings of the Royal Society 
notwithstanding the large number of lobes round the apertures. 
It has affinities with Aseidia and Gorella. The latter it resembles 
in the position of the viscera and in the shape and relative size 
of the intestine ; the branchial sac on the other hand differs 
greatly from that of Gorella , and exhibits the simpler structure 
found in Aseidia; while the membranes hanging from the transverse 
vessels and the languets replacing the dorsal lamina are exactly like 
the same parts in Gorella. 
Gorella japonica, n. sp. 
External appearance. — Shape longish ovate, the anterior end being 
narrower than the posterior. Attached by posterior end and half of 
left side; base sometimes prolonged into a few short tufts for 
attachment. Branchial aperture terminal or slightly on the right 
side of the extremity ; atrial more than one-third of the way down 
and on the right side, nearer the dorsal edge than the middle. Both 
apertures sessile and inconspicuous. Surface slightly rough, especially 
at the anterior end. Colour grey. Length, 3 cm. ; breadth, 1 cm. 
Test thin. 
Mantle very thin over most of the right side and lower half of 
left ; while on the anterior end of the right side, the anterior (upper) 
half of the left side, and the tubes, muscular bands are extraordinarily 
developed, and attain a great thickness (up to 3 mm). Branchial and 
atrial tubes very muscular, the latter is the longer. Both apertures 
have ring-shaped ocelli of a light rust colour. 
Branchial sac not folded. Internal longitudinal bars bear very 
long tapering papillae. Stigmata curved, placed on the sides of 
conical infundibula set in square meshes. Secondary vessels coiled 
spirally, connected by a few radiating vessels. Broad horizontal 
membranes extend between the papillae on the inner aspect of the sac. 
Dorsal lamina in the form of languets. 
Tentacles many, long, filiform. 
Viscera on right side of branchial sac. Intestine large. 
Two specimens from Yokohama, Japan, shallow water. 
Several specimens from Kobd, Japan, 8 to 50 fathoms. 
