On the Classification of the Crustacea Choristopoda. 318 
G. 9. MzrrrA, Leach, D.—Epimer:e 5tce 4tis multo breviores (sie an semper?) Styli 
caudales uno ramo longo, sive subcylindrico sive foliaceo, altero brevi vel obso- 
leto. [Digitus in manus latus sepe claudens.]] Antenn:e lm:e ssepius longiores. 
3* Antennz lm; appendiculatze. 
G. 10. Mena, Leach, D.—Epimerse et styli caudales postici ac in Melitá. 
8. Styli caudales postici simplicissimi, ramo uno brevi et nudo, apice paulo reffexo et 
spinas duas perbreves paulo exsertas gerente. 
G. 11. DrencornBozs, Dana.—Epimerse mediocres, 5tze bene bilobatz, 4tis sepius 
vix breviores. Pedes 1mi ?dique digito uni-articulato confecti. 
G. 12. Pvcrmus, Dana, (Erichthonius, Edw.?)—Epimerze mediocres vel breves 
corpore lineari, subdepresso. Antenne longs, flagellis sat longis. Manus 1mse 
articulis 4to 5toque szpe instructz, digito unr-articulato; 2dz» digito 2-articulato. 
G. 18. (An hujus sedis?) PanpaL.Isca, Aróyer*—Epimere breves. Pedes lmi 
2dique digito 2-articulato manuque 1l-articulatá instructi, Antenn:e tenues, 1mze 
appendiculatz. 
B. FRONS PRODUCTUS ANTENNASQUE lMAS VERSUS EXTREMITATEM GERENS. 
. [AN sPECIES COROPHIDIS AFFINIORES.] 
G. 14. Arvrvs, Leach.—Iphimedice paulo affinis: Antenns subpediformes, btevi- 
ores, non appendieulate. Digiti 1mi 2dique uni-articulati. 
G. 15. IscuvRocEnvs, Aróyer.]—Gammaro paulo affinis. Antenns pediformes, 
lm: appendiculate. Palpus mandibularis longus, articulo ultimo obovato. 
Pedes 2di maris manu validissimá instructi Digiti uni-articulati. Epimerse 
mediocres. 
IL. rEpEs 10 PosTICI PARTIM PREHENSILES. 
Subfam. 53. PONTOPORINAZE.—Pedes 3tii 4tique plus minusve prehensiles; 6 
postici non prehensiles. i 
1. .Antenne 2dc inferiores et non posteriores. 
G. 1. LePipacrvum, Saoy.]—Epimere magne. Antenns superiores appendiculatze, 
inferiores basi infra valde dilatatze et partim dolabriformes. Pedes 4 antici fili- 
formes; 3ti 4tique manu compressá digitoque laminato instructá; 5ti 6ti ''mique 
valde compressi, "mis longioribus, articulis superne valde productis. 
G. 9. PoxriPoREnA, Kr.&—Epimerz magne.  Antenns superiores appendiculate, 
Pedes 1mi 2dique perbreves, robusti, lmi manu latá ungue brevi confecti, 2di 
manu carentes; 3tii 4tique validi, manu articulo 4to dilatato instructá, ungue 
conico aculeato; '/mi ungue vel articulo 6to rudimentario. 
G. 3. AwPzLIscA, K7.|—Epimerz magne. Antenne graciles, Pedes 1mi 2dique 
manu nullá subchehformi; 3tii 4tique manu articulo 8tio instructá, digito artieu- 
lis 3 sequentibus formato, articulo ultimo vel ungue longissimo et gracillimo ; 
5ti 6tique 5-articulati, ungue rudimentario recurvo, immobili (vel parum mobili). 
Styli caudales postici natatorii. 
G.4. PRorowEDpEn, Ar.€|—Corpus subdepressum, epimeris sat brevibus. An- 
tennz superiores appendiceulatze, inferiores pediformes, basi pralongo. Manus 
Sti 4tzeque articulis 3tio 4toque instructz et digiti longi articulis sequentibus 
coalitis. Pedes 2di parvi, manu subcheliformi non instructi. 
* Tids.iv, 153, 1842. * Caput crassiuseulum." * Mandibula apice dilatata, quad: 
ridentata, palpo 3-artieulato."  * Pedes 3tii 4tique paris ungue sublaminari postice 
subtiliter serrulato." * Pedes spurii [abdominales] 2di et 3tii paris natatorii, reliqui 
saltatorii." 
i Tids.iv. ^Pedes spurii 4ti 5ti 6tique paris saltatorii; articulus basalis 6ti paris 
articulis terminalibus triplo vel quadruplo longior." 
Í Jour. Acad. Nat. Sci. Philad,, i 379. Here falls Be/lia of C. Spence Bate (Ann. 
and Mag. N. Hist. 1851, [2], vii, 318.) 
S Tids. iv, 152. * Pedes 5ti et 6ti paris recurvi, articulo 1mo parum modo dilatato 
ungue armati pusillo." 
| Tids.iv, 154. *Oculi simplices?" *Sextum pedum abdominalium par natatorium." 
«| Tids. iv, 154. 
Sxcoxp SEniEs, Vol. XIV, No. 41.—Sept., 1852, 40 
