CLASSIEIOATION OP THE MAIOID CEUSTACEA. 649 



legs more or less dilated and compressed. Type Huenia proteins, 

 De Haan. 



SiMOGAKCiNUS, Miers. E-ostrum as in Huenia, (but shorter. 

 Prseocular spine wanting. Sexes dissimilar. Hands in adult 

 male turgid, not cristate above. Ambulatory legs not compressed. 

 Type Simocarcinus simplex (Dana).' 



The type of this genus is tlie Huenia simplex of Dana : this 

 species and his H. irevirostrata are obviously male and female of 

 the same form. Specimens are in the British Museum of both 

 sexes. 



Ctclonyx, Miers. Eostrum laminate, flattened, very broad, 

 and transversely oval in shape. Eyes situated in the narrow- 

 angle between the base of the rostrum and front of the carapace, 

 the sides of which are produced into dilated wing-like expansions 

 as in Huenia. Type Oyclonyx frontalis ("White). Only known 

 from a single female in bad. condition. 



** Eyes mohile. Sexes similar. 



Menj<;thius, M.-Edw. Eostrum slender, acute. Prseocular 

 spine well developed. Carapace subtriangular. Anterior legs 

 with the palm slightly compressed, fingers arcuate. Ambulatory 

 legs not compressed. Type Mencstliius monoceros, Latr, 



§§§ Carapace usually more or less ohlong or orMculate in outline. 

 Nostrum flattened, emarginate , hifid, or tivo-spined. Frcsocular 

 usually ivell developed. Eyes mobile. Easal antennal joint 

 dilated at iase, narrowinrj distally. Ambulatory legs of moderate 

 length. 



* Elagellum of antenncs concealed heneatli tlie rostrum and not 

 visible from above. 



*Leucippe, M.-Edwards. Eostrum laminate, divided by a nar- 

 row median fissure. Carapace subtriangular or subpentagonal. 

 Prseocular spine wanting. Basal antennal joint not much en- 

 larged at the base. Type Leucippe pentagona, M. -Edwards. 



This genus marks the transition from the preceding section to 

 the present one. 



MiMULUs, Sfimpson. Eostrum laminate, bifid. Cara- 

 pace flattened, subpentagonal, with the lateral margins in both 

 sexes produced into bilobate laminate expansions. Prseocular 



