294, REPORT—1868, 
Cytheropteron multiforum (Norman), Common, 30-140 fathoms. 
alatum, G, O. Sars, Overs, af Norges mar. Ostrac. p, 81, “‘ Lateral 
protuberance yery large, triangular, slightly inclined downwards, and 
running out into a strong mucro, which projects at the sides; its hinder 
margin furnished with (about twelve) flattened tecth, the two inner- 
most much larger than the rest, and in the form of quadrangular serrated 
lamin. Lateral aspect of female elongated ovate, the greatest height, 
which is in the middle, much less than half the length, equally rounded 
in front, behind projecting into a very large process, which is obliquely 
truncate at the end; dorsal margin regularly arched, ventral slightly 
sinuated, the lateral protuberance projecting below in the centre of the 
yentral margin. Dorsal aspect almost cruciform, the greatest width 
(between the lateral protuberances) exceeding twice the height, and 
even somewhat surpassing the length, suddenly attenuated in front, and 
more gradually behind. ‘The shell of the male scarcely differs from that of 
the female except in the smaller size, Valves white, pellucid, smooth, 
finely toothed on the front margin,” A single specimen of this interesting 
addition to our fauna, in sand dredged 5-8 miles east of the Island of 
Balta, in 40-50 fathoms. The form is most remarkable, on account 
of the immense projection of the lateral ale and their dentated edge. 
—— rectum, Brady. The type was “dredged by Mr, D. Robertson, in 
Lerwick Bay, Shetland, in a depth of 12-14 fathoms” (G.S. Brady). I 
have procured a second specimen in St. Magnus Bay, in about 60 
fathoms, 
Bythocythere simple (Norman). St. Magnus Bay, and 10 miles east of 
Balta, 50-73 fathoms. 
constricta, G. O. Sars. Widely distributed in deep water to 100 
fathoms. 
—— turgida, G. O, Sars. St. Magnus Bay, and 10 miles off the Island of 
Balta, 50-73 fathoms. 
-— tenuissima, n.sp. Elongated, doubly fusiform, both extremities acu- 
minate, equally gradually attenuated to sharp central points ; greatest 
height central ; length to height as 3-4 to 1: dorsal margin gently con- 
vex throughout ; ventral slightly flexuous, but slightly arched through- 
out the greater part of its length ; both margins gradually approaching 
each other towards the extremities: valves very thin and fragile, their 
surface perfectly smooth and glabrous. Dorsal view remarkably com- 
pressed and greatly elongated, widest in the centre, and gradually be- 
coming narrower (it is only possible for them to become in the slightest 
degree narrower) to the extremities. Length 54, inch. 
St. Magnus Bay, 30-60 fathoms. I place this species provisionally 
in the genus Bythocythere, as it seems more nearly related to B, sim- 
plex in general structure than to any other Ostracod. The lateral aspect 
of the carapace finds its nearest counterpart in Bairdia anqusta, G. O. 
Sars; but whereas that species is tumid this is exceedingly compressed. 
Pseudocythere caudata, G. O. Sars. 20-25 miles N.N.W. of Burrafirth, in 
100-140 fathoms; 10 miles east of Balta, 50-73 fathoms; and St. 
Magnus Bay, 30-60 fathoms. 
Sclerochilus contortus (Norman). Very common at all depths, 1-70 fathoms. 
uradowostoma variabile (Baird). In extraordinary profusion on Laminaric 
in Balta and Bressay Sounds ; also Out Skerries and Hillswick. 
Normani, Brady. Among Laminariz, Bressay Sound, St. Magnus Bay, 
and 5-8 miles east of Balta, 5-50 fathoms, alive. 
— abbreviatum, G. O. Sars. St. Magnus Bay, 50 fathoms. 
