ZO UR iw r- dat 
MAUI M Rudi re t 
G'enera of Gammaracea. 139 
B. Antenne secunde post primas insite, fronte in rostrum productá. 
l. Manus tertize quartzeque articulis tertio quartoque 
instructe, et digiti articulis sequentibus coalitis. Àn- 
tennze antice appendieulate, breves. Pedes primi 
secundique subcheliformes. Phozus* (Kroyer). 
SuBFAM. III. Isxiwz. 
Pedes sex quatuorve postici subprehensiles. 
À. Antenne secunda subtus primas insita. 
l. Gammaro similis. Pedes decem postici similes. 
Antennz sup. appendiculatze. Isea (M. Edw.). 
2. Pedes terti sexti septimique crassé cheliformes ; 
secundi minores; primi quarti quinti minimi. Digiti 
toti uni-articulati. nisopus (Templeton). 
B. Antenne secunde post primas insite, fronte in rostrum productá. 
1. Pedes decem postici subcheliformes, similes. Laphystiust (Króyer). 
Faw. Ill. Conorurpz. 
a. Digiti duo 9-articulati. 
l. Antenne totz flagellis confectze. Caput et seg- 
mentum proximum in unum coalita. Pedes quarti, 
quinti, sextique obsoleti ? Cerapodina (M. Edw.). 
2. Antenne flagellis carentes. Cerapus (Say). 
b. Digiti nulli 2-articulati. 
* Antenne inferiores flagellis carentes. 
1. Pedes secundi non subcheliformes. Corophium (Lat.). 
2. Pedes primi secundique subcheliformes. -Podocerus] (Leach). 
1 Antenne quatuor flagellis gracilibus confectae. 
l. Pedes primi secundique subceheliformes. Antenne 
superiores appendieulate. UnciolaS (Say). 
2. Pedes primi secundique subcheliformes. Antennae 
superiores non appendiculata. Atylus (Leach). 
* Tids,iv,150. *Sextum pedum par ceteris multolongius" * Epimera permagna." 
1 Tids, iv, 186. * Antenne sat breves, subulate, valide." ^ Pes primi paris gra- 
cillimus, manu lineari, unzue elongato; pes secundi paris brevis, validus, manu quad- 
rata, ungue sublaminari apice setoso. Reliqui decem pedes validi, subcheliformes, 
eadem ferme longitudine. Epimera mediocris magnitudinis ; quartum par in acumen 
inferne productum." 
I The Siphoncecetes of Króyer (Voy. Scand., etc., 1838-1840, pl. 20, fig. 1; Tids,, 
N. R., i, 481, 1845) differs from Podocerus only in having the posterior legs longer 
than the four precelinz. In his description he says, p. 491:— 
* Pedes thoracici primi et 2di paris validissimi, manu instructi subcheliformi. 
Pedes 3tii et 4ti paris articulo primo latissimo, laminari; articulo quarto obcordato, 
laminari, manum przbente, cujus unguis efficitur articulo quinto subeonico articuloque 
sexto aciculari Pedes 5ti 6tique paris minutissimi, sed robusti, recurvati, articulo 
primo clavato, ungue furcato. Pedes 'imi paris graciles, recurvati, articulo primo 
laminari, unzue minutissimo, furcato. Pedes abdominales lmi, 2di et 3tii paris nata- 
tori breves validissimi, parte basali latissima, rhomboidali; pedes 4ti, 5tique paris 
saltatorii, pes ab lominalis sexti paris natatorius unica instruetus lamina terminali." 
8 Glauconome of Króyer (ibid, pl. 19, fiz. 1; Tids, N. R., i, 491, 1845) has the 
hands and antenns of Unciola. The followinz is the description, p. 501 :— 
* Antenne subpediformes; superiores flizello ornate appendieulari perparvo. 
Oculi minuti, parum distincti. JMandibule apex in duos fissus ramos qui dentibus 
