123 Botany and. Zoology. 
Fam. 3. ParnzwoNipu.—Mandibule crasse, sive palpigere sive non 
palpigere, profunde bipartitze, processu apicali oblongo, angusto. : 
Subfam. 1. ArPHEINJ.——Pedes imi crassiores, cheleti; 2di fili- 
formes, carpo szepius annulati et chelati. Mandibulse palpigerze. 
—GezNERA : ÁAlpheus, Fabr., Betzeus, D., Alope, Whiie, Atha- 
nas, Leach, Hippolyte,* Leach, Rhy ncocinetes, Exo; —[Cujus 
sedis genus Ántonomea, Risso 2]. 
Subfam. 9. PAxNpALINE.— Pedes lmi gracillimi ; non chai 2di 
filiformes, carpo annulato.—Gzwus : Pandalus, Leach. 
Subfam. 3. PALEMwoNIN4E.— Pedes 2di lmis crassiores, 4 antici 
chelati, carpis nullis annulatis. Pedes nulli palpigeri. Squama 
antennarum externarum non acuminata et extus non spinigera. 
—GznERA mandibulis non palpigeris : Pontonia, Latr., CEdi- 
pus, D., Harpilius, D., Anchistia, D.; mandibulis palpigeris, 
MU D., c NND T Fabr. io Hymenocera, Latr., Cry- 
phiops, D. [Cujus sedis genus Typton, Costa, ? ] 
Subfam. 4. OrLoPnHoniN x.— Pedes 9di crassiores, chelati, Imi sive 
didactyli sive vergiformes. Squama antennarum externarum 
acuminata, extus spinis armata.—GENERA : Oplop aM, Edw., 
Regulus, D. 
2. Maxillipedes 2d? tenuiter pediformes. 
Fam. 4. PasiPRziDz.—-Pedes lmi 2dique chelati. Mandibulz. uti in 
Atyidis.-—GENvus : Pasiphea. 
Subtribus IV. PENZEIDEA, vel MACROURA INFERIORA. 
Pedes 3tii majores, 2dis similes ; interdum toti debiles et vergiformos; 
Carapax uti in Carideis. 
Fam. 1l. PENXi1D4.--Pedes 3tii bene didactyli, validiores. .— Palpus 
mandibularis latus.--GENERA: Sicyonia, Edw.; Penzus, Latr. ( Aris- 
tao, Duvernoy, incluso,) Stenopus, Latr., Spongicola, .DeH. 
Fam. 2. SERGESTIDz.--Pedes 3tii 9dique- Imique debiles, obsolete 
chelati vel non chelati. Palpus. mandibularis gracilis.——GENERA : 
Sergestes, Edw., Acetes, Edw., et forsan Euphema, Edw. 
Fam. 3. EvcoPipz.— Pedes tii 9dique vergiformes, non chelati; Imi 
maxillipedesque externi eque monodactyli et subprehensiles, digito 
in articulum penultimum claudente. Palpus mandibularis gracilis.— 
GzNus: Eucopia, Dana. 
New Genera described. 
TaxrzxaA.—-Pedibus Callianasse affinis. . Flagella antennarum in- 
ternarum articulo precedente breviora, antennis supediformibüs. 
* Periclimenes, Costa, ( Ann. dell'Acad. degli Aspir. Nat. di Napoli, ii, 1844) hardly 
differs from Hippolyte, according to Erichson, Arch. f. Nat. 1846, p. 310. 
t Leander, Desmarest, (Ann. Ent. Soc., France, 1849, p. 8) appears to be iden- 
tical with Palzmon. 
