ON THE SHETLAND CRUSTACEA, TUNICATA, ETC. 291 
especially at the hinder extremity. Hinge-tooth of the left valve absent. 
Eyes very small, round. Colour pale brownish yellow, the limbs pale yel- 
low. Antenne rather long, third and fourth joints of the upper pair 
coalesced, the last joint short ; lower pair with the third joint narrower 
than usual, and the terminal nails long. Branchial appendage of the 
palp of the mandibles very small, only bearing two sete, one rudimen- 
tury and hamate. Legs slender, second joint of last pair subequal in 
length to the two succeeding, terminal nail very slender. Copulative 
organs of male small, the terminal part obtusely triangular.” Unst Haaf, 
20-25 miles N.N.W. of Burrafirth, 100-140 fathoms. Now first added 
to our fauna. 
Cythere crenulata (G. O. Sars). Cythereis crenulata, G. O. Sars, Overs. af 
Norges mar. Ostrac. p. 39. 
‘Not unlike C. emarginata, but the shell much more ventricose, 
height and breadth subequal; side view very short, the height much 
exceeding half the length, obliquely rounded in front, behind subtrun- 
cate and slightly emarginate, the lower lobe the more prominant: dor- 
sal margin a little concave behind the eyes, then convex; ventral 
margin nearly straight, or indistinctly waved in front of the middle. 
Dorsal view very tumid in the middle, the two extremities slightly 
prominent and subtruncate. Valves indistinctly areolated, but closely 
and finely punctate, the front margin and lower part of the hinder 
margin forming two lips, the innermost of which is crenulated with 
fine teeth, and fringed with rather long hair; surface uneven, a rounded 
protuberance before the middle, and two elongated protuberances to- 
wards the hinder extremity, one of which is near the dorsal, the other 
near the ventral margin. Eyes very large.” Rare, 20-25 miles N.N.W. 
of Burrafirth, 100-140 fathoms. New to Britain. 
emarginata (G. O. Sars). One young specimen (?) in St. Magnus Bay, 
about 60 fathoms. 
—— leioderma, n. sp. Carapace very tumid, subquadrate, length to height 
as about two to one; greatest height anterior: dorsal margin nearly 
straight; ventral also nearly straight, slightly sinuated in the middle: 
anterior extremity subtruncately and subobliquely rounded, infero- 
anteal corner well rounded, commencement of anterior dorsal slope a 
little angled; posterior extremity truncate, not at all oblique, slightly 
emarginate in the middle. Valves smooth, not sculptured, having only 
a very few distant punctured papille. Dorsal view long-elliptic, very 
tumid; breadth equal to one-half of length, of nearly equal width 
throughout, and remarkably regularly rounded at the broad extremities. 
Length 5. inch, 
This species has much more the aspect of a Cytheridea than of a 
Cythere, but the hinge-margin is not toothed. In the genus Cythere it 
should perhaps come next to C. albomaculate. 
From very deep water, Unst Haaf, 1867. 
Jytheridea papillosa, Bosquet. Rare, Unst Haaf, 1867. 
—— punetillata, Brady. Unst Haaf, 100 fathoms. 
—— subflavescens, Brady. One specimen, 5-8 miles off Balta, 50 fathoms, 
1867, exactly agreeing with the type; another in St. Magnus Bay. 
—— NSorbyana, Jones. 80-100 fathoms, 20-25 miles N.N.W. from Burra- 
firth Lighthouse, 1867. 
Zetlandica, Brady. The type specimens were found by me among a 
gathering of shells &e. procured by washing weeds in Shetland, by Mr. 
Barlee. 
