282 rnrEpoRtT—1868. 
Microdeuteropus versiculatus, Bate, The figures given of this species repre- 
sent the female. The male differs greatly in the structure of the first 
gnathopods ; these have the carpus very large, ovate, and very broad, 
infero-posteally produced into a simple tooth-like process, which reaches 
forward to not quite half the length of the hand; hand as wide or wider 
at the extremity than at the base; posterior margin convex, undulated ; 
finger internally serrated, serrations very few, three to five only, Rare 
in Shetland; 70-80 fathoms, Outer Haaf, 
—— Websteri, Bate. Bate and Westwood’s figure represents the male. 
Specimens from Bressay Sound have a deep brown broad band across 
the pereion; and in company with them were other specimens similarly 
marked, and agreeing in general characters, but with gnathopods of 
totally different structure. These I take to be the females. They so 
closely resemble the females of Aora gracilis and Microdeuteropus ano- 
malus that one description would suffice for all. Also taken among 
Laminariz in St. Magnus Bay and on the Haaf. I question whether 
there are sufficient grounds for separating the genus Aora from Miero- 
deuteropus. We haye seen that the females of two are almost undis- 
tinguishable ; and if Aora be divided from Microdeuteropus because the 
tooth-like projection proceeds from the meros and not the carpus, M. 
Websterti must in justice have a similar distinction conferred upon it, 
because in that species the tooth-like projection does not spring from 
either meros or carpus, but from the hand. 
Genus Mzcampuorvs, n. g.* 
Antennee slender (imperfect), the insertion of the lower so much behind that 
of the upper that the end of the third joint of the peduncle is only on a level 
with the end of the head. First segment of pereion produced forwards and 
downwards on each side into a remarkable horn-shaped process. Both pair 
of gnathopods greatly developed, of equal size, and subchelate. First three 
pereiopods short, last two much longer, Telson tubular. 
Megamphopus cornutus, n, sp. (species typica). Head produced greatly be- 
yond the origin of the inferior antenne ; eye round, black, immediately 
behind the base of the superior antenne, and thus greatly in advance 
of the origin of inferior antenne. Superior antenne slender, first joint 
very much thicker than but only about half the length of second, sub- 
equal in length to last; (there is perhaps a very minute secondary 
appendage, one-jointed, not half length of first joint of filament; but as 
the filaments of the antenne are imperfect, I cannot speak with cer- 
tainty on the point, all I am confident of is that if there is a secondary 
appendage it is excessively minute). Inferior antenne with the distal 
extremity of the third joint only reaching the extremity of the head ; 
fourth joimt twice as long as third, and last joint rather longer than 
fourth; filament subequal in length to last joint of peduncle, com- 
posed of eight long articulations. First segment of pereion produced 
forward and downwards into a curious horn-like process, the form of 
the side of the segment and its process reminding one strongly of the 
side of a wheelbarrow and its handle. First gnathopeds greatly deve- 
loped; basos long and slender, two following joints short; carpus long, 
nearly four times as long as broad, anterior margin straight, naked, 
posterior margin gently convex, with little tufts of sets, distally pro- 
duced into a short blunt process which curves backwards; propodos 
* Méyas, great; dugdw, both; weds, a foot. 
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