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302 On the Classification of the Crustacea Choristopoda. 
Subfam. 9. SCYPHACIN /E.— Maxillipedes 2-articulati, articulo 2do lamellato. 
Antenne externa ad articulationem 5tam non geniculata. Styli caudales ae in Onis- 
cinis. Basis appendicum caudabBum aut brevis aut oblongus, ramo interno interdum 
omnino aperio. 
G. 1. Scyenax, Dana.—Flagellum antennarum 1-3-articulatum. t. 
G. 2. Srvroxrmscus, Dana.—Flagellum antennarum tenue, multi-articulatum, 
Subfam. 8. LYGINA/E-—Maxillpedes 4-artieulati elongati. Antenne externa 
ad artieulationem 5tam non bene geniculate. Styli caudales longi, basi longé 
exserto, ramis setiformibus, subzquis et que apertis. 
G. 1. Lx«ra, Fabr.——Basis appendieum caudalium apice simplex, ramosque duos 
simul gerens. 
G.9. Lxermtiuw, Brandt.*—Basis appendicum caudalium apice furcatus, rachio 
utroque ramum. setiformem gerente. 
K 
Fam. 3. ASELLID.JE. 
Corpus szepius plus depressum et laxé articulatum. Abdomen 6-ar- 
ticulatum, segmento ultimo grandi, scutellato. Appendices caudales 
styliformes, interdum brevissime. — Mandibule palpigere. Antenne 
internz conspicuze. : 
Subfam.1. LIMNORINJZE.—Abdomen 5-6-articulatum. 
G. 1. Lrwxon14.—Segmenta abdominis duo postica grandia, simul sumta scutellata. 
Subfam. 29. ASELLINZE.—Abdomen 1-?-articulatum. 
| l. Pedes thoracici subequi. 
OQ. 1. Juxna, Leach.—A ppendices caudales perbreves; branchiales laminá impari 
tecta. 
G.2. JuxgrpiNA, Ed»».— Appendices caudales perbreves; branchiales aperte. 
G. 3. AÁSELLUS, Geoffroy. —Appendices caudales elongate, Pedes antici subchelati. 
G.4. Jaw, Leach. 1——4Asel/o affinis. Pedes toti unguieulati, ungue bifido. 
G.5. HreNorowus, ÁAróyer.]-—Pedes 1mi subchelati, "dicito. 2-articulato ; . reliqui 
ambulatorii articulo 6to sub-rudimentario. A ppendices branchiales lamniná 
unicá permagná tecte. Thoracis segmenta latere 1 incisa et dentata. 
2. Pedes posteriores valde elongati. 
G. 6. Muxwa, Krüyer.$— Appendices caudales rudimentarie, Pedes antici cras- 
siores, subchelati; posteriores corpore multo longiores. 
Subtribus II... CYMOTHOIDEA. 
[The Cymothoicea correspond nearly to the Jsopodes nageurs of Ed- 
wards.|| "The subtribe thus embraces along with Edwards's ** Cymo- 
thoadiens" (Serolis excluded) his:** Spheromiens." The Cymothoa, 
ZEga and Spheroma sections are closely related, and constitute a single 
natural group. "The first (Cymothoide) has the antenne attached to 
the under surface of the head somewhat remote from the front margin, 
and the caudal stylets are free ; the second (ZEgide) has the antenne . 
* Zia, Koch. 1 Oniscodo, Latreille. 
] Nat. Tidsskr., [2], i1, 1847.. $ Ibid. ii, 1838, 1839, p. 612 and [2], ii, 1847. 
| The exce otions consist in our removal of his Pranisiens, and the genus Serolia, 
to the Anisopoda. 
