CLASSIFICATION OF TUE MAIOID CUTJSTACEA. 



G53 



sliining, with a flat rounded lobe [at its antero-cxternal angle. 

 Type SliJhognathiis cri/fJnrcus, v. Martens. 



TrcHE, 2^eJl {Platyrhynclius, Desb. & Schramm*). Upper or- 

 bital marf^^in behind the prreocular spine well developed, laterally 

 produced, and concealing the eyes, with a deep fissure. Ischium 

 and merus joints of outer maxillipedes flat and smooth, the third 

 or merus joint dovetailed into the second, not j^i'oduced, or with 

 a small lobe at its antero-external angle. Type Tijclie lamellifrons^ 

 Bell. 



Family II. MAIIDiE. 



Eyes retractile within the orbits, which are distinctly defined ; but often 

 more or less incom])lete below, or marked with open fissures in their 

 upper and lower margins. Basal antennal joint always more or less 

 enlarged. 



Subfamily 1. Mating. (See Plate XII. figs. 7-10.) 

 {Ma'iens crypt ophthalmes, M.-Edwards, part.). 



Carapace usually subtriangular. Rostrum well developed. Anterior 

 legs in male enlarged ; fingers not excavate at tii)s. 



This subfamily includes most of those typical forms which group 

 themselves around the common Maia, in which the carapace is 

 usually triangular or elongate-triangular, the rostrum emarginate 

 or two-spined, the orbits large, well defined and yet incomplete, 

 eyes completely retractile, anterior legs with fingers acute, and 

 ambulatory legs usually of moderate length. 



Stimpson proposed to separate as a distinct subfamily {Lepto- 

 pince) the group typified by Hgeria {Lejptopus^ Latr.), on account 

 of the broad and somewhat cordiform merus joint of the outer 

 maxillipedes. Egeria could not in any case be taken as typical of 

 the group, as in it the merus joint of the outer maxillipedes is not 

 cordiform, but truncated at its distal end. A certain affinity un- 

 doubtedly exists between the genera in which the merus joint is 

 cordiform, as also between those (typified by Camposcid) which 

 have the merus joint elongated, often rounded at the distal end, 

 and articulated with the next at the summit ; but those characters 

 cannot be employed as a basis for a general classification, and do 



* I have not had an opportunity of consulting Dr. Schramm's work, * Crua- 

 taces cle la Guadeloupe d'aprcs un manuscrit du docteur Desbonne, Ire partie, 

 Brachyura. Basse-Terre, 8vo, 1807." In referrhig to it I have followed M. 

 A. Milne-Ed wards's citations. 



