94 Rathbun American Species of Palicus. 



C'. Meri without strongly dentate anterior crest. Lateral margin of 



carapace with less than four teeth besides the orbital. 

 D. Anterior margin of meri of second and third ambulatory legs 



terminating in a nearly rectangular non- projecting tooth. 

 E. Lateral teeth of carapace dentiform, acute, scarcely projecting 

 beyond the margin of the carapace. zonatus Rathbun. 



E x . Lateral teeth tuberculiform or lobiform, projecting from the 



margin of the carapace. 

 F. Two frontal lobes, each bilobed. 



alternalus Rathbun, new species. 

 F / . Two frontal lobes, each obscurely emarginate. 



isthmius Rathbun, new species. 

 D'. Anterior margin of meri of second and third ambulatory legs 



terminating in a spiniform, projecting tooth. 

 E. Lateral margin of carapace with three teeth besides the orbital. 



tuberculatus Faxon . 



E'. Lateral margin with two teeth besides the orbital. 

 F. Branchial regions much swollen. 



obesus A. Milne Edwards. 

 F'. Branchial regions not swollen. 



G. Granules of carapace very fine, not visible to the naked 

 eye. dentatus A. Milne Edwards. 



G r . Granules of carapace coarse. 



faxoni Rathbun, new species. 



B'. Crests on the second and third abdominal segments and on the 

 fifth sternal segment forming conspicuous laminiform expansions 

 visible in a dorsal view. 



C. Posterior margins of laminiform crests of first and second ab 

 dominal segments subparallel in a dorsal view. 



bahamensis Rathbun, new species. 



C'. Posterior margins of laminiform crests of first and second ab 

 dominal segments not subparallel, that of the second having a 

 greater median expansion. 



D. Ridge above the posterior margin of the carapace one unbroken 

 curve ; distal end of meri of ambulatory legs without a tooth. 



depressus Rathbun, new species. 

 D'. Ridge above the posterior margin sinuous ; distal end of meri 



with a tooth. 

 E. Length of carapace more than | its width. 



angustus Rathbun, new species. 

 E'. Length of carapace f its w T idth or less. 



sica A. Milne Edwards (restricted). 

 A'. Length of second ambulatory leg more than twice the width of the 



carapace. 



B. Front with two teeth. 



C. Chelipeds smooth. gracilipes A. Milne Edwards. 



C'. Chelipeds tuberculate. w-niifrom A. Milne Edwards. 



B'. Front with four teeth. 



