70 
Proceedings of the Royal Society 
Olfactory tubercle simply oval, aperture at tlie narrower anterior 
end ; horns not coiled, nearly touching. 
One specimen from Station 150 (South of Kerguelen Island), 
150 fathoms. 
Styela clava , n. sp. 
External appearance. — Club-shaped, the pyriform body being 
supported on a stalk of variable length, erect, not compressed; 
anterior end narrow but generally straight for a short distance, from 
this the body widens rapidly for the first two-fifths of its length 
and then narrows more gradually in the remaining three-fifths, 
the posterior end being prolonged into the stalk, which is generally 
about equal to the body in length. Apertures at the anterior end, 
four cleft, more or less projecting, but minute and inconspicuous; 
branchial at the ventral edge of the anterior end, directed ventrally ; 
atrial at the dorsal edge of the anterior end, more prominent than 
the branchial, and therefore more anterior, directed anteriorly. Sur- 
face very irregular ; posterior half of the body and stalk creased 
longitudinally, anterior half of the body nearly covered by irregu- 
larly-shaped but smooth and blunt knobs mostly directed anteriorly; 
Colour dirty white, with occasionally a slight yellowish tinge. 
Length (total), about 7 cm. ; breadth (at broadest part of head), 
about 2 cm. 
Test tough but thin, and almost papery except on the knobs and 
processes. 
Mantle very delicate and closely united to the test, musculature 
very feeble. 
Branchial sac with four narrow folds on each side. Internal 
longitudinal bars rather numerous, about nine on a fold and twelve 
in the interspace. Meshes transversely elongated, containing each 
six stigmata, and occasionally divided by a narrow horizontal mem- 
brane. 
Dorsal lamina smooth and plain, no ribs and no teeth. 
Tentacles about thirty, rather closely placed, not large, all about 
the same length, but some rather stouter than others. 
Olfactory tubercle transversely elongated, horns simply curled 
inwards, 
