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enumerations of synonyms I am sure that he has mixed together 

 at least three of thèse species. Dana figures E. pellucida as a very 

 slender species with small eyes; if his figures be tolerably correct 

 none of m'y four species can be referred to that form. I suppose 

 that Dana has examined spécimens of E. gibba, G. O. S., which 

 on the whole agrées well with his figures and besides is common 

 and has a wide distribution, but as he does not mention or 

 figure the thin process on third abdominal segment the question 

 can not be settled. I must therefore discard E. pellucida, Dana, 

 as unrecognisable, and will now give a brief account of the four 

 species at hand. 



Conspectus of the Species possessing two paires of 

 latéral denticles on the carapace. 



A. Front part of the carapace covers at most half of the eye- 

 stalks, and most frequently only the insertion or nothing 

 of thèse stalks is overlapped. 



a. Leaflet on the upper end of first antennular joint has the 

 distal margin straight or slightly convex and deeply 

 pectinate with several (6-8) setiform denticles ; its outer 

 angle is produced into a narrow process with about three 

 similar denticles E. Mûlleri, Claus 



b. Leaflet on the upper end of first antennular joint either 

 oblong triangular or, generally, distally bifid or with the 

 distal margin rather concave; a row of setiform denticles 

 is never found, but frequently the distal angles of the 

 leaflet, and in rare cases a small angle on the concave 

 margin, are produced into such denticles. 



a. Font part of carapace short with a narrowly trian- 

 gular rostrum well developed. Outer distal angle on 

 the upper side of second antennular joint without any 

 spiniform process, at most with a conical tubercle 

 which is only as long as or shorter than a tubercle or 

 process on the inner angle. 



