282 REPORT 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. Eare 

 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 

 Laminariae in St. Magnus Bay and on the Haaf. I question whether 

 there are sufiicient grounds for separating the genus Aora from Micro- 

 deuteropus. We have 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. 

 Websterii 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 MEGAMPHOPTJS, n. g.* 



Antennae 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. 



MegampTiopus cornutus, n. sp. (species typica). Head produced greatly be- 

 yond the origin of the inferior antennae ; eye round, black, immediately 

 behind the base of the superior antennas, and thus greatly in advance 

 of the origin of inferior antennae. Superior antennae 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 antennae 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 antennae with the distal 

 extremity of the third joint only reaching the extremity of the head ; 

 fourth joint 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. Pirst gnathopods 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 setae, distally pro- 

 duced into a short blunt process which curves backwards ; propodos 

 * Meyas, great ; u0w, both ; TTOVS, a foot. 



