CRUSTACEA. 



Fam. I. MAIIM. 



I. DIGITI ACUMINATI. 



A. carapax obloyigus. 



a. OCULI PLUS MINUSVE TRANSVERSIM PORRECTI. 



a. ANTENNA EXTEKNiE APERTiE. 



* Rostrum site elongatum she Ireve, porrectum, nan turn id urn 

 f Pedes 8 postici prselongi. 



1. IN ACHING. — Carapax triangulato-ovatus. Rostrum emargi- 

 natum aut integrum. 



G. 1. Inachus, Fabricius.— Carapax gibbosus, spina prseorbitali sive parvula sivc 



nulla, rostro brevi. Pedes 8 postici filiformes, 2dis 3-1-plo longioribus quam 



carapacis pars post-rostralis. 

 G. 2. Egeria, Latreille.— Carapax gibbosus 7 orbiculato-ovatus, rostro sat brevi, 



paulo reflexo. Pedes 8 postici filiformes longissimi (iis Inachi duplo longiores). 

 G. 3. Microrhynchtjs, Bell*— Carapax gibbosus, latitudine transorbitali parra, 



dente prseorbitali nullo, post-orbitali parvulo. Rostrum parvulum, integrum. 



Pedes 8 postici corpore fere duplo longiores. 

 Gr. 4. Chioncecetes, Kroi/er.-f — Carapax vix longior quam latior, subtriangularis, 



antice truncatus, rostratus, rostro bifido, brevissimo. Pedes 2di carapace plus 



duplo longiores, 2di ; 3tii, 4tique compressi. 



2. MACROCHEIRINiE.— Carapax late ovatus. Rostrum furcatum. 

 Pedes prselongi. Articulus antennarum externarum lmus solutus. 



G. Macrociieira, De Haan.\ — Carapax gibbosus, orbiculato-ovatus, spina pneor- 

 bitali parvula, rostro saliente, cornubus valde divaricatis. Pedes toti validi, lougi. 



-j-| Pedes 8 postici longitudine mediocres. 

 X Pars antennarum externarum moLilis viargine orbilce orta. 



3. MAIINiE. — Carapax orbiculato-ovatus, rostro prominente, pro- 

 fundi bifido. 



G. Maia, Lamarck. — Articulus antennarum externarum lmus spinis duabus longis 



* Zool. Trans., ii. 40. 



f Tidskrift, ii. 249. The species for which this genus was established is the Cancer 

 phalangium of Fabricius, Paun. Groenl., n. 214, and Cancer ojnlw of the same author, 

 in Det danske vid. Selsk. Skr. nye Saml., iii. 180, scqu. cum tabula. 



I Crust. Pauna. Japonica, 88. 



