270 REPORT 1868. 



very short, scarcely longer than broad, apically broadly truncate, and ter- 

 minating in four strong spines and two plumose setae. Acoustic organ large. 

 Nematopus serratus, G. 0. Sars, Om en i Sommeren 1862, Zoolog. lleise 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 antcnnaB 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- 

 tennae, transversely truncate at the apex ; external margin having 8-9 

 spine-like processes down the side (each similar in character to the single 

 apical spine of the scale in My sis flexuosa and its allies). Pereiopods 

 remarkably long and slender, last joint terminating in a bunch of hairs. 

 Telson not half the length of the inner laminae, 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 

 setae. External laminas considerably longer than inner, narrow, and of 

 nearly equal width throughout ; both margins of both pairs of lamina) 

 fringed with plumose seta3, which on external margin of outer laminae 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. 



Nannastims binoculoides, Bate, Ann. Nat. Hist. 3rd ser. vol. xv. (1865) p. 87, 

 pi. i. fig. 4. The type specimen dredged in 1863 ; again in surface net, 

 Lerwick Bay, 1867, by Mr. D. Robertson. 



Diastylis echinata, Bate, Ann. ]STat. Hist. 3rd ser. vol. xv. (1865) p. 87, pi. i. 

 fig. 1. The type specimen dredged in 1863. 



bispinosa (Stimpson)=CWa bispinosa, Stimpson, Marine Invertebrata 



Grand Manan, p. 39; Danielssen, Reiseberetning i Thr. Yid. Selsk. Skrift. 

 Bd. iv. p. 108, =Cuma cornuta, A. Boeck, Videnskabs Selsk. Eorhandl. 

 1863, p. 190, = Diastylis bicornis, Bate, Ann. Nat. Hist. 3rd ser. vol. xv. 

 (1865) p. 84, pi. i. fig. 2, = Diastylis bispinosa, G. 0. 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. 



Icevis, n. sp., = ? Alauna rostrata, Goodsir, Edinb. New. Phil. Journ. 

 vol. xxxiv. (1843) p. 130, pi. 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 antennae having last joint of peduncle 

 as long as the first and longer than the second ; filament as long as last 

 joint of peduncle. Eirst feet with the first joint very long, equal, or nearly 

 equal, to the remaining portion of the limb ; both margins furnished 

 with plumose setae, spinose on the side ; last three joints subequal. 

 Second feet having the fourth joint as long as the first, and longer than 



