250 AMl'lIirODA NOUMALIA. 



of the body, with the peduncle of tlie inferior pair much longer 

 than that of the superior. First pair of gnathopoda of moderate 

 size, propodos ovato-elliptic ; second pair the larger, having the 

 propodos oblong,with the inferior margin slightly oblicjuc, bisinuate. 

 Pleopoda of nearly equal length, 

 " Length G lines. 



" Hah. Coast of Naples." — Costa. 



Doubtful siyecies. 



35. Ainpliithoe Azteca. 

 Ampliithoe Azteciis, Snussiire, Rev. et 3Iag. de Zool. ix. p. 505, 1858. 



*' xVntennce nearly equalling half the length of the body ; superior 

 shorter than the inferior. Cephalon. without a rostrum. Eyes 

 nearly circular. Fii'st pair of gnathopoda small ; second paii' 

 very large. Two posterior segments of the pleon terminated by a 



sjiine. 

 Lengtl 



" Hah. Vera Cruz." — Saitssure. 



" Length 5 millim 



2. SUNAMPHITHOE. 



Sunamphithoe, S^JOice B<ite, Brit. Assoc. Report, p. 59, 1855 ; Synopsis, 

 ^c, Ann. Nat. Hist. Febr. 1857. 

 JVliite, Hist. Brit. Crust, p. 201, 



Telson developed into the form of a hook. 



This is the only distinction that separates the animals of this genus 

 from Amjihithoe. 



1. Sunamphithoe Hamulus. (Plate XLIIL fig, 5.) B.M. 



Sunamphithoe Hamulus, Spence Bate, Si/nojjsis, &-c., Ann. Nat. Hist. 

 Febr. 1857. 



niiite, Hist. Brit. Crust, p. 202. 



Tjjes (not preserved). Antennae suheqital : superior pair one-thiixl the 

 length of the animal, having the peduncle as long as the flagellum, 

 the third joint scarcely more conspicuous than the first articulus 

 of the flagellum : inferior pair having the flagellum scarcely longer 

 than the last joint of the peduncle. First pair of gnathopoda 

 having the propodos as long again as broad, the superior and 

 inferior margins parallel, palm oblique, fiu-nished with a few short 

 hairs ; dactylos as long as the palm, having the inner margin ser- 

 rated. Second pair of gnathopoda having the propodos subtrian- 

 gidar, nearly as broad as long, broadest at the palm ; palm straight, 



