Rev. A. M. Norman on Crustacea Cumacea. 63 
distal spine ; penultimate joint of first legs longer than, and 
commonly folded back upon, the antepenultimate ; last joint 
about half the length of preceding. Upper antennce with fila¬ 
ments longer than usual, the longer equalling the last two joints 
of peduncle, the shorter as long as the last joint. Pleopods 
well developed on first and second segments of pleon. 
Telson with six to seven pairs of lateral spines. Uropods 
very slender ; peduncle furnished with about twenty-five com¬ 
plex spines on the inner margin ; inner ramus with the three 
joints subequal in length, 1st with sixteen to eighteen, 2nd 
with seven to eight, 3rd with four to six spines; outer ramus 
longer than the inner, with two to three short seta? on internal, 
and five to six on external margin. Length 7 millims. 
One specimen dredged in Lough Swilly, co. Donegal, in 
15 fathoms, 1 Porcupine,’ 1869. In the following year I took 
the species in the tow-net off Yalentia. 
15. Diastylis Calveri , n. sp. 
Male. Cephalothorax much wider than deep. Carapace not 
deep, dorsal line only slightly arched; surface not spined, with 
two curved plica3 on the central portion, and extending from 
the dorsal line to the margin; numerous little pits stud the 
surface ; and the stomachal region is furnished with numerous 
lucid spots (as in D. sculpta and other species); lateral margin 
unusually straight, strongly serrated in front; rostrum very 
short, blunt, and broad, hollowed above at the base. Third 
free segment with a pair of dorsal spines ; first, second, and 
last denticulately serrated on the front dorsal margin ; epimera 
of last segment only slightly produced backwards, and bearing- 
two or three plumose setre. Pleon with a pair of thorn-like 
spines on the under surface of first segment, a spine at the 
dorsal posterior angle of each segment, and a spine at the 
posterior ventral angle of the first two segments. First pereio- 
pods extending beyond the rostrum by their last two joints, 
the first of which is longer than the antepenultimate and three 
times as long as the last joint. Telson and uropods very 
slender ; the telson has the anal aperture very far back, almost 
at its commencement, and at some distance from the end of 
the thicker anterior portion; this anterior portion is channelled 
above, the edges of the channel being serrulated ; distal and 
more slender portion of telson with five pairs of very slender 
lateral spines; terminal spines largely developed and long. 
Uropods with eight to eleven spines on inner margin of 
peduncle; inner ramus having 1st joint with nineteen to twenty- 
two, 2nd with four, 3rd with three and terminal spines, the 
whole of the inner margin is also minutely pectinate, with ex- 
