CRUSTACEA. 



Gr. 1. Stegocephalus, Kroyer* — Epimerae 4tse maximae, 5tis parvis. Antennae 

 superiores appendiculatae. Pedes lmi 2di manibus carentes. [Pedes 5ti 3tii 

 4tique directione similes.] 



Subfam. 2. LYSIANASSINiE. — Antennae breves, superiores basi 

 crassae. Mandibulaa apice parce dentatae et cuspidatas, acie vix in- 

 structaa palpo 2-3-articulato. Maxillipedes lamellis internis grandi- 

 bus. Epimerae permagnae. 



1. Pedes lmi 2dique non subchelati, 2dis parvulis interdum exceptis. 



Gr. 1. Lysianassa, Edw. — Antennae superiores appendiculatae. 

 Gr. 2. Phlias, Gu&rm. — Antennae superiores non appendiculatae. 



2. Pedes lmi subchelati, Idis non subchelatis. 



Gr. 3. Opis, Kroyer.^ — Antennae superiores appendiculatae. Pedes lmi crasse 

 chelati, 2di debiles. 



G-. 4. Uristes, Dana.% — Antennae superiores non appendiculatae. Pedes lmi sub- 

 chelati, 2di articulo styliformi confecti. 



3. Pedes lmi Idique plus minusve subchelati. 



Gr. 5. Anonyx, Kroyer.§ — Epimerae permagnae. Antennae superiores appendi- 

 culatae, basi breves. Maxillipedes lamellis internis grandibus. Styli caudales 

 postici biramei, ramis subulatis. 



Gr. 6. Urothoe, Dana. — Epimerae permagnae, 5tis parvis. Antennae lmae bre- 

 viores, appendiculatae, basi sat elongato. Styli caudales postici longi, biramei, 

 ramis foliaceis, ciliatis. Mandibulae palpo 3-articulato. 



* Kroyer's Nat. Tids., iv. 150, 1842. w Caput oculis ut videtur destitutum." 



f Tids., iv. 149. " Pedes lmi paris chelis armati portentosae magnitudinis. Reliqua 

 cum genere Anonyce ferme conveniunt." 



% Amer. J. Sci. [2], viii. 135. The genus Stenia is rejected. 



§ Tids. ii. 256, and iv. 164. 



The genus Ephippiphora of White (Ann. and Mag. N. Hist. [2], i. 226, 1848) has 

 been but briefly described, and we cannot pronounce upon its exact relation to either of 

 the genera of Lysianassinae. The habit is like that of Anonyx, the epimerals large, the 

 superior antennae appendiculate, the posterior caudal stylets elongate as in Anonyx, and 

 not short like the Orchestidae. But the character of the termination of the four anterior 

 legs is not stated, neither are they in view in the figure of the species on Plate 5 of the 

 Zool. of the Erebus and Terror. This figure represents the fifth and sixth pairs of legs 

 as rudimentary, or the basal joints twice as long as the following part, and the basal 

 joint of the sixth smaller than that of the fifth or seventh. 



