238 Transactions.—Zoology. 
directed posteriorly. Posterior pair of pleopoda biramous, Telson simple, 
divided, squamiform. 
18. Deramine pacifica, nov. sp. Fig. B.4. 
Cephalon without a rostrum, but produced into an aeute tooth between 
the bases of the antennsz.  Pereion smooth; segments of pleon dorsally 
and posteriorly three-spined, and with the inferior margin produced 
posteriorly into an acute tooth. Eyes ovate-reniform. Superior antenna 
about as long as the body; basal joint stout, with a spine at its lower 
anterior margin; second joint about twice as long; flagellum 40-50- 
jointed. Inferior antennse about two-thirds as long as superior, slender; 
basal joint very short; second joint as long as corresponding joint of upper 
antenne; ultimate joint of peduncle just half as long; flagellum about 
25.-80-jointed. Gnathopoda of first pair larger than second, with the 
inferior margin of the carpus and propodos crenulated and hairy; palm 
oblique, dactylos nearly straight. Second gnathopoda similarly toothed and 
hairy; propodos shorter, dilated, with two spines at the base of the palm; 
dactylos curved. Pereiopoda slender, thickly setose, all having the dactylos 
directed posteriorly, except the last pair, which also are much the longest. 
Penultimate pair of pleopoda reaching to extremity of ultimate; ante- 
penultimate much shorter. Telson bifid, apex of each division with two or 
three small teeth and a few short hairs. Length ‘25 inch. (No locality). 
Genus Atylus, Leach, Zool. Miscel., ii., pl. 69; Edwards, Hist. des Crust., 
iii., p. 67; S. Bate, Brit. Mus. Cat. Amphip. Crust., p. 188. 
Iphimedia, Dana, U. S. Explor. Exped., p. 926. 
Animal compressed. Antenne subequal; superior without a secondary 
appendage. Mandibles with an appendage. Maxillipeds unguiculate, having 
a squamiform plate developed from the bases and isehium. Gnathopoda 
subchelate. Pereiopoda subequal. Posterior pleopoda biramous.  Telson 
single, squamiform, divided. 
Differs from Dewamine in having the third joint of the peduncle of the 
upper antenne distinguishable from the flagellum, and in having an 
appendage to the mandibles. 
14. Atylus dania, nov. sp. Fig. C.1. 
Cephalon produced into a short rostrum. Segments of the pleon 
slightly elevated posteriorly, fourth segment with a deep dorsal sinus, none 
prolonged into teeth; margins smooth. Eyes large, round, black. Superior 
antenne about a third shorter than the inferior; joints of the peduncle 
short, subequal, produced into three teeth on the lower margin; flagellum 
with over 25 artieulations, which are broader than long, every third or 
| fourth joint produced on its inferior margin into a tubercle, bearing several 
| m and a crown of short hairs, Inferior antenne half as oe as 
