of Edinburgh, Session 1879-80. 
715 
of the alternate transverse vessels being interrupted here and there, 
and sometimes altogether wanting. Internal longitudinal bars 
narrow but well-marked, having papillae at the angles of the meshes ; 
generally three stigmata in a mesh. 
Tentacles, very long and numerous, their bases almost touching. 
Dorsal lamina plain ; no ribs or teeth. 
One specimen from Station 163 (Twofold Bay, Australia); 120 
fathoms. 
Ascidia despeda , n. sp. 
External appearance. — Shape oval ; the anterior end being narrow 
while the posterior is wider and rounded. Dorsal edge rather more 
convex than ventral. Attached by posterior half of left side. 
Branchial aperture near anterior end ; atrial not distant, on dorsal 
edge about one-fourth of the way down. Surface covered with small 
soft projections giving a rough appearance. Colour grey. Length, 
1*7 cm.; breadth, 1 cm. 
Test thin, nearly transparent, showing fine vascular ramifications. 
Trunks enter near centre of area of attachment. Test prolonged 
into a few short tufts near base of left side. 
Mantle normal. 
Branchial sac not plicated, rather stout. Internal longitudinal 
bars strong, bearing large papillae at the corners of the meshes, no 
smaller intermediate ones ; three or four stigmata in a mesh. 
Tentacles large and numerous, all one length. 
Dorsal lamina wide, transversely ribbed; margin plain. 
One specimen from Kerguelen Island ; 10 to 100 fathoms. 
Ascidia nigra , Savigny. 
Three specimens from Station 142 ? (south of Cape of Good 
Hope) ; 150 fathoms. 
Ascidia pyriformis , Herdman. 
A large specimen from Port J ackson ; 6 fathoms. 
Ascidia placenta, n. sp. 
External appearance. — Shape elongate, elliptical or oval; flat- 
tened laterally; the anterior end slightly the narrower, posterior 
