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X. On the Characters of the Genus Thalassina of 

 Latreille, with a Description of one Species, 



THALASSINA. 



Thalassina. Latreille, Leach. 



AntenncE in eadem fere linea horizontali insertae : 



interiores articulis duobus subaequalibus : pedun- 



culus magiius antenna longior : setas duae in- 



asquales ; interiore breviore, tenuiore. 



e.rteriores articulis tribus primis elongatis; se- 



cundo longiore : seta multi-articulata elon2;ata, 



Pedipalpi eTternl cdiule. interno 5-articulato piloso; articulo 



primo longiore spinnloso ; articulis aliis inermibus. 

 Pedum paria duo antica didactyla : digitis interne denti- 

 culatis ; pollicibus abbreviatis : (pari antico maximo in- 

 asquali ; pari secundo submonodactylo valde compresso, 

 supra ac infra piloso :) paria 3 et 4 compressa ; ungues 

 subtus spinosi ; par 5 simplex ; unguis inermis. 

 Testa compressa antice rostrata, postice producta. 

 Abdomen 7-articulatum : articulo primo aliis altiore ; arti- 

 culis 2, 3, 4, 5, et 6 lateribus inferne marginatis : arti- 

 culo 7 elongato magno, lamellis duabus angustis linea- 

 ribus in pedunculum subgibbosum insistentibus utrinque 

 instructo. 



This genus inhabits the Indian seas ; and although the 

 characters are so very peculiar, yet it has been confounded 

 with Gebia, a genus found in the Red and Mediterranean 

 seas and European ocean. 



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