On the Classification of the Crustacea Choristopoda. 307 
Subfam. 1. BOPYRINZ.—Thorax appendicibus branchialibus carens. 
G. L Boryrus, Latr. —Pedes thoracis 'seandeae manu imperfecta confecti. Appen- 
lamin4 nnic4d 
G, 2. Puryxus, Rathke. *—Pedes thoracis maris ancorales, Jemine manu - 
fectd confecti. aminis pose 
inzequis nudis is compos site, una vel ambe Jamine laterales; maris rudimen 
G. Pe Crron, Duvern oy.t—P edes “ora feminz non unguiculati, per pulvillum 
rminalem ancor scion Appendices abdominis femine branchiales numero duo- 
dec, elongaté lamellate et bene ais 
G. 4. Dass, Kréyer.t—Maris abdom ol 
pedes thoracis bene unguiculati; appen is numero re oblonge, 
t duabus terminalibus m rem gyre dacs s. abdominis late 
rales, due posticee caudales breves, exserte. 
casa 2. IONIN Ai.—Pedes thoracis ad ~~ appendices simplices branchiales 
gerente, 
men 6- raiticdlabt, 
thoracis manu imperfecta confecti. Appendices ab- 
is tenuiter cpltadrices Jemine ramose preter duas 
G. 2. Arcera, bo rE eies Moraes. manu. imperfecta confecti. Appendices 
emine rales, bir I nudis; maris nullis, 
abdomine non secs pa 
—Pedes 
ai Lat e 
acilbatee latrales mar 
tim. 
TRIBUS IIL 
AMPHIPODA. 
Subtribus I CAPRELLIDEA. 
Fam. I. CAPRELLIDA.. 
Corpus longum et fere filiforme. Antenne 2dz lonageadinn: medi- 
ocres. [Species non parasitice.] 
1. Pedes thoracis numero 14. 
G.1. Proto,§ Leach—Mandi pa a. ate oe segmentis 2do 3tio 4to- 
que affixe, Polo sea m8 toti articulis no: 
G2 —Mandibule palpigere. .~ anchiz segmentis 3tio 4toque 
affix, Pedes 3tii daqhs obsoleti articulo 1mo styliformi excep 
2. Pedes thoracis tii 4tique omnino obsoleti. 
G. 3. Capretia, Lamk—Man am oe non palpiger. Branchiz segmentis thoracis 
— 4toque affixe. Abdomen brevissimum, 1—2-articulatum, 
4. Marna, Kréi er.| Mani bula palpigers, ge 8-articulatis, Branchiw ac 
tum. 
in “Capre Wd. A en bre ee 
G. 5. Cercoprs, Krier Mandi ule ne plfgagerse Branchiw segmentis 2do 3tio 
4toque affix, Abdomen bathed tum, appendicibus 4 elongatis 3-articulatis. 
3. Pedes 3tii 4ti 5tique obsoleti. 
G.6. Poparmus, Kréyer.**—Branchiz segmentis 3tio 4toque affixee. 
Fam. 2. CYAMID. 
: a latum, depressum, Antenna 2de obsolete. [Species para- 
Sitica : 
G, 1 ‘Cramus. 
* Feu Hocweyetis es des Sci. Nat. [2], xv, 110, pl. 4, 
Voy Rar de aon a, Latreille. 
Voy. Seand, pL 25, and Tids [2], i 283. 
