UOU AMl'lill'ODA NOUMALIA. 



i!2)iiii)sa are the siinie species be an o'l-oi', tin-}- euiioiLsly represent 

 each oth(?r ; for where the larger form abounds, the small udult speci- 

 mens appear to be rare, if not altogether absent. 



5. Amathia pingiiis. 



Gamnianis pin<>uis, Krik/er, (ironl. Amfip. p. :24. pi. 1. f. o. 

 Edicurds, Hist, des Crust, iii. p. 50. 



" Pleon terminated by a telson, single, rounded, and armed with two 

 little spines. Gnathopoda nearly linear. 



*' Hab. Greenland." — Edwards. 



It is with much doubt that I place this animal in this genus ; but 

 the short description of M. -Edwards distinctly shows that it does 

 not belong to Gammarus. 



63. PALLASEA, n. g. 



Superior antenna) longer than the inferior, and furnished with a 

 sccondarj^ appendage. Inferior antenntc subpediform, having the 

 peduncle considerably longer than the flagellum ; the flagellum 

 short and stout. Mandibles having an appendage. MaxilHpeds 

 subpediform, having a small squamiform plate to the ischium only. 

 Gnathopoda uniform, moderately large. Pereiopoda subequal. 

 Posterior pleopoda biramous. Telson single, cleft. 



This genus is very nearly allied to Amathia, from which it differs 

 more in the general aspect of the animal than in structural details. 

 The form of the inferior antennae, together with the altered condi- 

 tion of the maxiUipeds, are appreciable characters that chstinguish the 

 genera from each other. 



1. Pallasea Cancellus. (Plate XXXVI. fig. 1.) E.M. 



Oniscus cancellus, Pallas, Sfncil. Zool. fasc. 9. p. 52. pi. 3. f. 18. 

 Gammarus cancellus, Fabricius, Ent. Si/st. ii. p. 515. 



Hcrbst, Krahhni, ii. p. 125. pi. 25. "f. 12 (a/to- Pallm). 



Latrcilh; Hist, des Crust, vi. p. 317. 

 Amphithoe cancellus, LatreiUe, Encyc. 3Iethod. pi, 328. f. 6 {after 

 Pallas) ; Rk/ite Animal, 1 edit. iii. p. 47. 



Desmarest, Coiisid. sur les Crust, p. 268. 



Edwards, Ann. des Sci. Nat. xx. p. 377 ; Hist, des Crust, iii. p. 37. 

 Gammarus Latreillii, Guerin-Meneville, MS. Mus. Jar din des Plantes. 



Cephalon having a minute rostrum. Pereion having a rudimentaiy 

 dorsal carina and a large projecting tubercle towards the infero- 

 posterior angle of each segment. Pleon aimed with a slight doisal 

 carina, and a prominent tubercle on the first two segments and rudi- 

 mentary ones on the next two. Eyes subreniform. Superior an- 



