í Zoology. 427 
between the Maiinea and the Caneroid Crustacea, resembling the latter 
also in their short epistome. — The greater length of the anterior legs is 
not a necessary characteristic. "T'hey are also intermediate between the 
Maiinea and Dromioid species. "The genus Trichia, of which De Haan 
makes one of his grand divisions of the Brachyura, i is most nearly re- 
lated to the Parthenopinea—-the orbits, and antenne, epistome and ge- 
neral form of the body resembling the same in Parthenope. But in its 
maxillipeds it approaches Dromia, as shown by De Haan. 
T'elmessus of White appears to belong with the Corystoidea, as the 
suter antennze, in connection with the form, indicate. 
The following are the Families, Subfamilies and Genera of MairixEA 
with their characteristics : 
Fax. L. MAIIDAE. 
OcULI RETRACTILES, IN ORBITIS SESE LATENTES. 
1. DIGITI ACUMINATI. 
À. Carapax oblongus. 
€. OCULI PLUS MINUSVE TRANSVERSIM PORRKECTI. 
€x ANTENNZE EXTERNZE APERT.JE. 
* Rosírum sive elongatum sive breve, porrectum, non tumidum. 
t Pedes 8 posticl prelongi.- 
1l. INACHINJE.—Carapax triangulato-ovatus. Rostrum emarginatum 
aut integrum. 
G. 1. Ixacaus, Fabricius.—Carapax gibbosus, spiná przorbitali 
sive parvulá sive nullá, rostro brevi. | Pedes 8 postici filiformes, 
2dis 3—-4-plo longioribus quam carapax post-rostralis. 
G. 2. Ecznia, Latreille. —(Carapax gibbosus, orbiculato-ovatus, 
rostro sat brevi, paulo reflexo. Pedes 8 postici filiformes lon- 
EPUM (iis Inachi duplo longiores). 
G. 3. MicgongvuNcnus, Bell.*—Carapax gibbosus, latitudine trans- 
orbitali parvá, dente praorbitali nullo, post-orbitali parvulo. 
Rostrum parvulum, integrum. Pedes 8 postici corpore fere 
duplo longiores. 
9. MACROCHEIRINZE.—Carapax laté ovatus. Rostrum furcatum. 
Pedes prelongi. Articulus antennarum externarum lmus solutus. 
G. MacnocngiRA, De Haan.t—Carapax | gibbosus, orbiculato-ova- 
tus, spinà preeorbitali parvulá, rostro saliente, cornubus valde 
divaricatis. Pedes toti validi longi. 
1t Pedes 8 postici longitudine mediocres. 
] Pars antennarum externarum mobilis margine orbitc orta. 
3. MAIINZE.—Carapax orbiculato-ovatus, rostro prominente, profundé 
bifido. 
* Zool Trans, ii, 40. 1 Crust. Fauna Japonica, 88. 
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