1350 



CRUSTACEA. 



terdum 3-articulati. Cephalothorax segmento frontali partim vel 

 omnino destitutus. 



G-. 1. Cecrops, Leach. — Antennae anticae 2-articulatae. Pedes natatorii 2di 3tii 



4tique foliacei, basi late expanso, ram-is brevibus. 

 Cr. 2. LiEM ARGUS, Kr. — Antennae anticae 3-articulatae. Cephalothorax segmento 



frontali carens, segmentis 2do 3tioque breviter trans versis, sequente postice late 



expanso et bilobato. 



Subfam. 4. SPECILLIGINiE. — Pandarinis affinis. Oculi duo sim- 

 plices e lenticulis magnis prolatis corneisque grandibus (conspicillis) 

 oblatis testa insitis instructi (ac in Corycasidis) . 

 GL Specilligus, Dana* — Nogago segmentis cepbalothoracis pedibusque affinis. 



Fam. III. DICHELESTID^.f 



Subfam. 1. DICHELESTINiE. — Corpus angustum, pluri-articulatum, 

 non foliis ornatum. 



G-. 1. Dichelestium, Hermann. — Corpus angustum, pluri-articulatum, segmentis 

 non alatis. Antennae 2dae oblongae, crassiusculae, bidigitatae. Pedes 2di pre- 

 hensiles digito acuminato. Pedes natatorii 4 antici perparvi, 2-ramei; 3tiilobis 

 lamellatis mediocribus ; 4ti obsoleti. 



G. 2. Nemesis, Roux. — Corpus angustum, fere lineare, pluri-articulatum, seg- 

 mentis subaequis, non alatis. Pedes 2di, monodactyli; natatorii lmi simplicis- 

 simi, fere nudi, 2di, 3tii, 4tique breves biremes nudiusculi. 



Subfam. 2. ANTHGSOMATIN^.— Corpus angustum, foliosum et 



parce articulatum. 



G-. 1. Anthosoma, Leach. — Cephalothorax 2-articulatus, segmento lmo oblongo, 

 2do postiee elongate alato et bilobato. Antennae 2dae oblongo, apice uncinato. 

 Pedes 2di subeheliformes, digito aeuto. Pedes natatorii foliis latissimis instructi, 

 corporis latera postice tegentibus. 



* From Kroyer's description and figure of a specimen, which he refers with a query 

 to Lsemargus muricatus, as a young individual of this species, it is apparent that the 

 animal has the conspicilla of this family, and it may belong to our genus Specilligus. It 

 is similar to it in the joints of the body, and the caudal stylets. Our Specilligus was a 

 fourth of an inch long, and cannot be a young individual of a genus so remote as Cecrops 

 or Laemargus. 



■j" DichelestienSj Edwards, Crust., ill. 481. 



Lamproglena of Nordmann is arranged with the Dichelestidse by Edwards. The body 

 is elongate and few-jointed, as in Dichelestium, but the joints are fewer and less dis- 

 tinct; the eight natatories are very small or obsolescent; the second antennae are repre- 

 sented by a pair of hooks, looking like horns to the head. Moreover, the external ovige- 

 rous appendages are probably not simple tubes, but sacs. 



