3Q2 CRUSTACEA. 



G. 3. Lettcisca, WLeay .*— Carapax non tuberculatus, latere non dilatatus, antice 

 parce productus, antennis oculisque inferioribus, extremitateque frontis remotis. 

 Palpus maxillipedis externi latus, "brevis. Pedes antici breves [brachio parce 

 exserto]. 



G. 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. Antenna? internee obli- 

 quse, 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. Antennae interna} obliquae, sat grandes. 



G. 6. Nursia, Leach. — Carapax antice parce productus, deuticulis tuberculisve 

 partim ornatus. Palpus maxillipedis externi extus dilatatus. 



b. Pedes antici prcelongi, tcnues. [Carapax duobus vel pluribus spinis tuberculisve postice ar mains. 



Area buccalis triangulata.~] 



G. 7. Ilia, Leach. — Carapax globosus, postice 2-4 dentibus armatus, fronte bi-lo- 

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

 Digit! non in eodem piano cum manus articulatione. Pedes 8 postici subeylin- 

 drici. 



G. 8. Myra, Leach. — Carapax ante niedum 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 fc 

 postici uti in Leucosid. Fossae antennales fere transversa). 



2. Carapax latere ci/lindrice productus. [Area buccalis subquadrata. Articului 



maxillipedis externi Stius subtrianf/ulatus.] 



G. 10. IxA, Leach. — Pedes antici gracillimi. 



3. Carapax latere spinigerus. [Area buccalis subquadrata. Arficulus mflxillipcdi* 

 externi otius vix triangulatus, apicc late rotunda tus.~] 



G. 11. Iphis, Leach, — Carapax paulo rhombicus, antice productus ac in Leucosis, 

 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. 



