CLASSIFICATION OP THE MAIOID CHUSTACEA. 



G55 



well defined. Second and third joints of antemunc slender. Am- 

 bnlatory legs slender, cylindrical. 



Subgenus 1. Herbstia. Inferior margin of orbit without a 

 tooth. Ambulatory, legs not spinose. Type Herhstia condyliata 

 (Herbst). 



Subgenus 2. *Herbstiella, Stm. Inferior margin of orbit 

 toothed. Merus joint of ambulatory legs spinose. Tjpe Herh- 

 stielJa depressa, Stm. 



This genus establishes a relationship to MitJirax. 



*C(ELOCERTJS, A. Milne-Edwards. Carapace suborbiculate. 

 Rostrum prominent, with a shallow notch at its distal end, and 

 its lateral margins involuted. Second and third joints of antennte 

 slender. Legs short. Type Ccelocerus spinosus^ A. M.-Edwards. 



Is nearly allied to Lihinia ; and it may be desirable so to mo- 

 dify its characters as to include any species of that genus which 

 may have the orbital margin incomplete or notched. The involu- 

 tion of the margins of the rostrum is of minor importance, as the 

 same character occurs in a lesser degree in the typical species of 

 Lihinia (L. emarginafa) . 



§§ Bostrum composed of two more or less distinct divergent spine 

 Orlifs deep, so that tlie eyes, lolien retracted, are concealed; the 

 eyes themselves small, the eye-peduncles slender. 



t Orhits large, wit% a forward aspect, usually very incomplete below, 

 the upper orbital margin icsually prominent, ivith two deep fissures 

 and long spines. 



*Flagellum of the antenncB arising within the orbital cavity. 



Maia, Lamarch. (Plate XII. figs. 7, 8.) Spines of rostrum 

 divergent from their base. Carapace triangulate-oblong, the 

 interorbital space broad. Basal joint of antenniB very much en- 

 larged. Anterior legs in male rather slender ; wrist elongated, 

 not carinated. Type Maia sqidnado (Linn.). 



**Flagellim of the antennce arising tvithin the orbital margin, and 

 separated from the cavity of the orbit byanarroio process of the 

 basal joint. 



Paramithrax, M.-Edwards. Carapace subtriangiilar. Spines 

 of rostrum divergent from their base. Anterior margin of buccal 

 cavity straight, or nearly so. Basal joint of antenna) very much 



LINN. JOTJRN. — ZOOLOGY, YOL. XIY. 4D 



