58 PROCEEDINGS OF THE AMERICAN ACADEMY 



articulatum, segmento primo lato, tertio postice truncate, lamellis cau- 

 dalibus latis, paulo oblongis, contiguis, setis lamella brevioribus, fere 

 sequis. Furcula simplex, tenuis, basi angustissimo, brachiis divergenti- 

 bus. Pedes postici tenues, ramis valde insequis, ramo breviore 2-articu- 

 lato, altero 3-articulato. — Segmentum abdominis primum paulo oblon- 

 gum, subellipticum, angulis posticis rotundatis, segmentis sequentibus 

 dimidio angustioribus, non oblongis, subaequis. 



Hah. in branchias speciei Thynni, in mari Atlantico, lat. aust. 11°, 

 long. occ. 14°. — Lect. die 7 Maii, 1842. 



Subfamilia 2. PANDARINiE. 



Genus I. NOGAGUS. {Leach.) 



Cephalothorax 4-articulatus, fronte arcuata, segmento secundo ad latera 

 postice producto, duobus sequentibus non alatis. Abdomen stylis 

 brevibus sublamellatis setigerisque confectum. OcuK simplices, 

 remotiusculi ; (an quoque oculus subtilissimus intermedius ?). 

 Pedes paris secundi crass^ cheliformes ; pedes natatorii octo, 

 grandes. 



NoGAGUs VALiDus. — FemiTicB? Carapax paulo oblongus, ellipticus, 

 segmento secundo ad latera postice producto, segmentis duobus sequen- 

 tibus transversis. Pedes secundi paris crassissime cheliformes, pollice 

 brevi, truncate, digito obtuso. Abdomen 2-articulatum, segmento an- 

 tico subquadrato, angulis posticis prominulis ; segmento postico brevi, 

 transverse, angulis posticis truncatis. Styli caudales late lamellati, 

 paulo oblongo, setis tribus plumosis. 



Hab. in corpus Squali, mari Pacifico prope Novi-Zealandiam. — 

 Lect. die 15 Ap., 1840. 



Genus II. SPECILLIGUS. (Dana.) 



Nogago segmenta cephalothoracis pedesque affinis. OcuU duo re- 

 motiusculi, et consjncillis grandibus instructi, eisque Sapphirinae 

 similes. 



Specilligus curticaudtjs. — FemincBl Carapax oblongo-ellipticus, 

 antice arcuatus, discis suctatoriis post antennam anticam munitus. 

 Segmentum secundum ad fatera postice productum, tertium quarto la- 

 tius et dimidio carapacis parce latius. Pedes secundi paris crassissime 

 cheliformes, pollice brevi truncate, digito obtuso. Abdomen 2,articu- 



