270 REPORT—1868, 
yery short, scarcely longer than broad, apically broadly truncate, and ter- 
minating in four strong spines and two plumose sete, Acoustic organ large. 
Nematopus serratus, G, O, Sars, Om eniSommeren 1862, Zoolog, Reise i 
Christ, og Trondhjems Stifter (1863), p. 43. 
Carapace rounded in front, not produced into a rostrum, but a spine 
springs from between the eyes, and bears the appearance of a rostrum. 
Eyes reniform, clavate, wider than long. Superior antenne with mid- 
dle joint of peduncle very short, first and third subequal. Antennal 
scale lanceolate, about half as long again as peduncle of inferior an- 
tenne, transversely truncate at the apex ; external margin haying 8-9 
spine-like processes down the side (each similar in character to the single 
apical spine of the scale in Mysis flecuosa and its allies). Pereiopods 
remarkably long and slender, last joint terminating in a bunch of hairs. 
Telson not half the length of the inner laminz, no lateral spine, distally 
broadly truncate, and furnished with four long spines, the inner pair 
the more greatly developed ; in the middle between these are two plumose 
sete. External lamine considerably longer than inner, narrow, and of 
nearly equal width throughout; both margins of both pairs of laminz 
fringed with plumose setz, which on external margin of outer laminz are 
slender and short, Colour white, with a reddish spot on each side of each 
segment of pleon, and a band across the fourth ; sometimes also a longitu- 
dinal line on each side of the carapace. The very large reniform eyes 
are of a lovely and brilliant ruby-red. Length half an inch, Dredged 
on muddy bottom in 40-60 fathoms, St. Magnus Bay, 1867. 
Order CUMACEA. 
Nannasticus binoculoides, Bate, Ann. Nat. Hist. 3rd ser. vol. xv. (1865) p. 87, 
pl. i. fig. 4. The type specimen dredged in 1863; again in surface net, 
Lerwick Bay, 1867, by Mr. D. Robertson. 
Diastylis echinata, Bate, Ann. Nat. Hist. 3rd ser. yol. xy. (1865) p. 87, pl. i. 
fig. 1. The type specimen dredged in 1863. 
bispinosa (Stimpson)= Cuma bispinosa, Stimpson, Marine Invertebrata 
Grand Manan, p. 39; Danielssen, Reiseberetning 1 Thr. Vid, Selsk. Sknift. 
Bd. iy. p. 108, = Cuma cornuta, A. Boeck, Videnskabs Selsk. Forhandl. 
1863, p. 190, = Diastylis bicornis, Bate, Ann. Nat. Hist. 3rd ser. vol. xv. 
(1865) p. 84, pl. i. fig. 2, =Diastylis bispinosa, G, O. Sars, Om den 
aberrante Krebsdyrgruppe Cumacea og dens nordiske Arter (1864), p. 39. 
The first British specimen dredged in Shetland in 1863, and described 
by Mr. Bate under the name Diastylis bicornis. 
—— levis, n. sp.,=? Alauna rostrata, Goodsir, Edinb. New. Phil. Journ. 
vol, xxxiv. (1843) p. 130, pl. iv. figs. 1-10. 
Pereion, viewed laterally, elongated ovate, seen from above, widest 
in the middle, ovate; carapace rather longer than the free segments, 
dorsal margin well arched, surface only slightly hispid, wholly devoid 
of spines; lateral margins spined; rostrum acute, slightly bending up- 
wards. Last segment of pereion with the sides produced backwards 
into short blunt processes. Upper antennz haying last joint of peduncle 
as long as the first and longer than the second ; filament as long as last 
joint of peduncle. First feet with the first joint very long, equal, or nearly 
. equal, to the remaining portion of the limb; both margins furnished 
with plumose sete, spinose on the side; last three joints subequal. 
Second feet haying the fourth joint as long as the first, and longer than 
