. 310 On the Classification of the Crustacea Choristopoda. 
Fam. 1V.. ORCHESTIDA.* 
Saltatorie, pedibus nullis lateraliter porrectis. Corpus compressum, 
epimeris magnis. Abdomen appendicibus normale. Antenne non 
bene pediformes. Styli caudales Imi 2dique biramei; 3tii simplices, 
brevissimi et ultra 2dos non prolongati. Mandibule non palpigere. 
Maxille Ime Ppalpo sive parvulo et l-articulato sive obsoleto instructs. 
1. Orcnestra—Maxillipedes non unguiculati. Antenne Ima basi 2darum 
breviores. Epimere 5te 4tis parce breviores. 
Subgen. 1. Tatrrrus.—Pedes Imi maris Semineve manu 1 non instru 
Subgen. 2. Tatorcuestia, D—Pedes 1mi maris ac in Talitro, gr manu 
—_ instructi. 
“Su hs Orcuestia—Pedes lmi maris femineque manu plus minusve 
faatins 
G. 2. Attorcuestrs, Dana.—Maxilli ipedes unguiculati. Antenne Ime minores, 
. basi 2darum longiores, Epimeree Ste 4tis sepius multo breviores. 
Fam. V. GAMMARID/S. 
Saltatorize vel natatorie, pedibus nullis lateraliter porrectis. Corpus 
spius compressum, raro subdepressum, epimeris sive magnis sive par- 
is. Styli caudales laxiores, duobus ultimis oblongis sepiusque ultra 
2dos prolongatis, raro simplicibus. Mandibule seepissimé palpigere- 
Maxille Imz palpo 2-3-articulato (rarissimé 1-articulato) instructe. 
I, pepes 10 postic! NON PREHENSILES. 
Subfam. 1. STEGOCEPHALIN A.—Antenne breves, superiores basi crass 
Monditiele acie pine tnd fee palpo brevi uniartic ulato intus pero Epi 
#& permagne. 
G. 1. Srecocernatus, Kroyer. Pr sarah 4te maxima, 5tis parvis. Antenne 
superiores appendic ulate. Pedes Imi 2di manubus carentes. [Pedes 5ti Siu 
4tique directione similes. } 
Subfam, 2. LYSIANASSIN A. —Antennz breves, —. basi erascee 
dibule apice parce dentate, acie vix instructe, p 3-articulato. “Slanlipede 
lamellis internis grandibus. Epimere perm 
1. Pedes 1mi 2dique non subchelati, 2dis parvulis interdum exeeptis. 
G. 1. Lystanassa, Edw. a superiores appendiculate. 
G, 2. Putias, G'werin—Antenne superiores non appendiculate. 
2. Pedes lmi subchelati, 2dis non subchelatis. 
G. 3. Opis, Kr. Naples superiores appendiculate. Pedes Imi crassé chelati, 
2di debiles, 
ee on ee 
* The author gives a different oe of the species of csp capane 
tronus there instituted. He follows Fr. Miiller (Archiv f. Nat, pec 53) in in consid- 
ering the a and Orchestiz as fo’ ormiag single his recent investigations 
this view. The hiiadiaadls are rearrang' : | 
ae Kréyer’s Nat. Tids. i iv, 150, 1842. “Caput oculis ut videtur destitutum.’ 
eee eS aoe ot slows cha i portentose magnitudinis. 
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