On the Classification of the Crustacea Choristopoda. 311 
G. 4. Unisrzs, Dana. *— Antennz superiores non appendiculate. Pedes lmi sub- 
chelati, 2di articulo styliformi confecti. 
9. Pedes 1mi 2dique plus minusve subchelati. 
G. 5. Awoxyx, Kr.]—Epimerzs permagne. Antenns superiores appendiculatze, 
basi breves. Maxillipedes lamellis internis grandibus. Styli caudales postici 
.. biramei, ramis subulatis. 
G. 6. Unormor, Dana.—Epimersz permagn:z, 5tis parvis.  Antennz lmee brevi- 
ores, appendiculatze, basi sat elongato. Styli caudales postici longi, biramei, 
ramis foliaceis, ciliatis Mandibule palpo 3-articulato. 
Subfam.3. LEUCOTHOINJE.—Antenne superiores basi plus minusve graciles. 
Maxillipedes elongati, angusti, articulo longo ünguiformi confecti, lamellis internis 
perbrevibus. Mandibule sive palpigerz sive non palpigerz, processu molari carentes, 
[An semper?] Epimerz magna. 
G. 1. Srexornoz, Dana.—Epimerc permagne, 4tze maxime, 5tze parvule. Pedes 
4 antici subchelati, 9dis validioribus. Antenne superiores longiores, non appen- 
dieulate. Mandibule non palpigere, processu molari carentes. Styli caudales 
lmi 2dique ramis bene subulati, 3tii simplicissimi, subulati, spiná crassá confecti. 
G. 2. LzucorHor, Leach.j—Epimerz magnes, 5te parvule. Pedes 4 antici sub- 
chelati, 2dis validioribus. Antenns» superiores longiores, non appendiculatze, 
Mandibule palpigere. Styli caudales toti biramei, ramis subulatis. 
[Cujus sedis est Mierocheles, Króyer,$ Amphithoe affinis, cui mandibule processu 
molari carentes: quoque Amphithoe Marionis, Edw., cui mandibule non palpigerz.] 
Subfam. 4. GAMMARINJE.—Antenn: 1m basi graciles. Maxillipedes sat lati, 
lamellis internis sat elongatis. Mandibule acie denticulatá instructz et alterá ac- 
cessorià quoque processu molari et palpo 3-artieulato. Pedes 10 postici non sub- 
prehensiles. 
À. FRONS PRODUCTUS ET INFRA ANTENNIGERUS NON EST, ANTENNIS lMIS INFERIORIBUS 
NON ANTERIORIBUS. 
l. Styli caudales postici biramei, ramis subequis. 
A. PEDES 2DI NON SUBCHELATI. 
G.1. AcawrHoNorUs, Owen.— Antenne quatuor subsqu:e, 1me non appendiculate. 
Epimere magna. Pedes 2di filiformes, manu omnino carentes, Imi manu vix 
confecti. 
G. 2. ALrBRorUs, Edw.—Antennze 1mze breves, appendiculate.  Epimere magna. 
Pedes 1mi validi non subchelati. 
* Amer. J. Sci. [2], viii, 135. The genus Stenia is rejected. 
1 Tids. ii, 256, and iv, 164. ; 
The genus Ephippiphora of White (Ann. and Mag. N. Hist. [2], i, 226, 1848) has 
been but briefly described, and we cannot pronounce upon its exact relation to either 
of the genera of Lysianassinz. "The habit is like that of Anonyx, the epimerals 
large, the superior antennz appendiculate, the posterior caudal stylets elongate as in 
Anonyx and not short like the Orchestide. But the character of the termination of 
the 4 anterior legs is not stated, neither are they in view in the figure of the species 
on plate 5 of the Zool. of the Erebus and Terror. This figure represents the 5th 
and 6th pair of legs as rudimentary, or the basal joints twice as long as the follow- 
lug part, and the basal joint of the 6th smaller than that of the 5th or 'rth. 
I Kroyer states that the bi-articulate finger of Leucothoe is not a true generic 
characteristic, and adds two species to the genus, one of which has this character 
imperfectly and the other not at all. (Nat. Tids. iv, 141, 1842, and [2], i, p. 539, 
1845). "This character of the hand depends mainly ou the prolongation of the infe- 
rior apex of the antepenult joint, which prolongation is variously developed in spe- 
cies of allied genera. "They agree with Leucothoe in their peculiar slender maxilli- 
peds ; in the very small epimerals to the 1st segment, large 4th, and small 5th, 6th 
and "th; in the caudal stylets; the very short 3d joint of the superior antenn:e, and 
other characters. $8 Tids. N. R. ii, 5. 
