GAMMAUinji. 97 



and propoclos wider. Picon, except the foui'th sognient, sliglitly 

 c^riniitod or tingulated dorsally. TeLson narrower than in A. macro- 

 ccphala, lanceolate. Posterior paii' of pleopoda having the rami 

 broader, lanceolate, the exterior l)cing a little shorter than the 

 interior, and tipped with coarse spines. 

 Length about 12 lines. 



" Taken with A. macrocephaJa, biit more rare. 

 " Uah. Kiillabcrg, Norway." — Liljeborg. 



Subfamily 4. PHOXIDES. 



Pontoporeides, Dana, U. S. Explor. Erped. p. 912. 



Speiice Bate, Synopsis Brit. Amph., Ann. Nat. IliM. Feb. 1857. 

 Phoxides, <S^;t7«v Bate, Ann. Nat. Hist. vol. xx. p. 525, 1857. 



The cephalon is produced in advance, more like a hood than a rostrum. 

 The superior antenna; arc situated considerably in advance of the 

 inferior. The integumentary stnxcture is generally thin and semi- 

 transparent ; and I am inclined to think that most of the genera 

 arc burrowcrs, for which piu'posc the hood-like cephalon affords 

 an efficient protection. The three posterior pairs of pleopoda arc 

 double-branched. 



» 



17. PHOXUS. 



Phoxus, Kroyer, Tidskr. vol. iv. p. 150. 



Eyes not appreciable*. Superior antennae with a complemcntaiy 

 appendage ; inferior antenna) as long as the superior. Mandil)le 

 apijendiculate. MaxilUpeds subpediform. ]}oth pairs of giiatho- 

 poda subchelate. Coxae deeper than the respective segments. Pos- 

 terior pair of pereiopoda shorter than the preceding. Telson double. 



1. Phoxus simplex. (Plate XVI. fig. 1.) P.M. 



Phoxus simplex, SpeMe Bate, Ami. Nat. Hist. vol. xx. p. 525, 1857. 

 Phoxus Kruyeri, Spence Bate, Synopsis Brit. Amph., Ann. Nat. Hist. 

 Feb. 1857 ; Brit. Assoc. Riport, 1855 (not Stimpson). 

 nitite, Hist, of Brit. Crust, p. 173. 



Cephalon nmch jjroduccd anteriorly. Superior antcnnjc having the 

 extremity of the flagellum not reaching beyond the anterior margin 

 of the cephalon ; the flagellum short, 8-jointed ; secondary append- 

 age longer than the primary, 4-jointed. Inferior antennae as 

 long again as the superior; the joints of the peduncle scarcely 



* Having seen only dead specimens, this is but a doubtful diagnosis. In ninny 

 spocifs, where the eyes are not strongly marked, tlu-y disappear very shortly 

 after death. 



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