144 AMPniPODA xoini \r,iA. 



posterior lateral niar<ijin entire. Eyes sulirenifoiin, blaek. Superior 

 antennae nearly half as long: as the animal : peduncle nearly half as 

 long as the Hagollum : fii-st joint of the peduncle as long as the 

 eephalon, hroad and robust ; second not half as long as the first ; 

 the third still shorter. Inferior pair not longer than the superior ; 

 peduncle half the length of the superior antennae : small tufts of 

 hairs are placed at tolerably regular distances upon the under side 

 of the peduncle of the superior, and the upper side of the peduncle 

 of the inferior antenna;. Telson long, entire. In other respects the 

 animal docs not differ materially from that of Atiihis ■hisp'mom!<, 

 exce])t in the appearance of the integument under the microscope, 

 which in this species offer's nothing remarkable. 

 Length about ^tt^^^ ^^ ^^ inch. 



Hah. Banff {Mr. Edward) ; Tenby and Falmouth {Mr. Wehster). 



3. Pherasa bicuspis. (Plate XXVII. fig. 7.) 



Ampliitoe bicuspis, Kriiyer, Gron. Anrfij). p. 45. pi. 1. f. 1. 

 Ediv. Hist, des Crust, iii. p. 38. 



This species appears to differ from P. cirni.f in the greater length 

 and more slender form of the antennae, particularly of the superior 

 pair, and in having no antagonizing tufts of hairs upon the two pairs ; 

 in the greater length of the dactyla upon the gnathopoda, and in the 

 posterior pair of pleopoda being shorter. 



Hab. Greenland {Kroyer). 



Some specimens taken at Sligo, Bangor (eo. Down), and Belfast Bay, 

 in 6 to 1 fathoms, by Mr. Thompson, belong probably to this .species ; 

 they are in his collection of Irish Amphipoda, for an examination of 

 which I am indebted to Mr. Westwood, to whom they were entnisted 

 by their late owner. 



4. Phenisa costata. (Plate XXYII. fig. 8.) 



Amphitoe costata, Edn: An>i. des Sc. Xat. xxv. p. 374. pi. 10. f 14 : 

 Hist, des Crust, iii. p. 39. 



" Pereion smooth above, but furnished on each side with a prominent 

 ridge, formed by a series of elongated eminences, which occupy 

 the inferior part of each segment, and are prolonged posteriorly in 

 the form of spines. The peduncle of the superior antenna? is 

 formed of three joints, the length of each of which gradually de- 

 creases ; the flagellum consists of about thirty articuli. The 

 pedimcle of the inferior antennfe reaches a little beyond that of 

 the superior ; the flagellum is veiy long, and consists of about fifty 

 articuli. Eyes circular. Appendages to the mandibles very large, 

 consisting of /o?(r joints*. First pair of gnatlio]ioda a trifle larger 



* Fig. 16, /. c\, shows but three. This is tlie iionnal nmiiber. 



