392 CRUSTACEA. 



G. 3. LEUCISCA, M'Leay.* Carapax non tuberculatus, latere non dilatatus, antice 

 parce productus, antennis oculisque inferioribus, extremitateque frontis remotis. 

 Palpus maxillipedis extern! latus, brevis. Pedes antici breves [brachio parce 

 exserto]. 



Gr. 4. EBALIA, Leach. Carapax interdum tuberculatus, latere dilatatus et margine 

 tenuis, fronte latiusculo. Oculi grandiores, marginales. Palpus maxillipedis ex- 

 terni mediocris, extus rectus. Pedes antici mediocres. Antennae internae obli- 

 quae, sat grandes. 



G. 5. NUCIA, Dana. Carapax tuberculatus, latere non dilatatus, fronte latiusculo, 

 oculis grandioribus, marginalibus. Palpus maxillipedis externi angustus, extus 

 rectus, longus. Pedes antici breves. Antenna; internae obliquae, sat grandes. 



Gr. 6. NDRSIA, Leach. Carapax antice parce productus, denticulis tuberculisve 

 partim ornatus. Palpus maxillipedis externi extus dilatatus. 



b. Pedes antici praelongi, tenues. [Carapax duobus velpluribus spinis luberculisve poslice armatus. 



Area buccalis triangulata.~\ 



Gr. 7. ILIA, Leach. Carapax globosus, postice 1-A dentibus armatus, fronte bi-lo- 

 batus, latere non dilatatus. Palpus maxillipedis externi angustus, extus rectus. 

 Digiti non in eodem piano cum manus articulatione. Pedes 8 postici subcylin- 

 drici. 



G. 8. MYRA, Leach. Carapax ante medum paulo latior, postice 2 3-spinis ar- 

 matus. Palpus maxillipedis externi angustus, extus paulo dilatatus. Digiti uti 

 in Leucosid. Pedes 8 postici compressi. 



G. 9. PERSEPHONA, Leach.-f Carapax globosus, postice 3 spinis armatus, latere 

 parce dilatatus. Palpus maxillipedis externi uti in Ilia. Digiti pedesque 8 

 postici uti in Leucosid. Fossae antennales fere transversae. 



2. Carapax latere cylmdrice productus. [Area buccalis sulquadrata. Articulus 

 maxillipedis externi Stius subtriangulatus.] 



G. 10. IXA, Leach. Pedes antici gracillimi. 



3. Carapax latere spinigerus. [Area bucealis sulquadrata. Articulus maxillipedis 

 externi 3tiu$ vix triangulatus, apice late rotundatusJ] 



G. 11. IPHIS, Leach. Carapax paulo rhombicus, antice productus ac in Leucosid, 

 supra inermis, spina longa latere armatus, postice spinis paucis aliis. Pedes an- 

 tici gracillimi. 



G. 12. ARCANIA, Leach. Carapax globosus, undique multispinosus, fronte promi- 

 nenter bilobatus. Pedes antici sat longi, mediocriter graciles. 



* M'Leay in Smith's Illustrations of Zool. of S. Africa, Crust., pi. 3. 

 f Includes Guaia, Edwards, Crust., ii. 127. 



