The Beach -Flea. 77 



of shell cover the legs just as in Gjmmaras. The last 

 four rings of the abdomen are very small, and the last 

 three pairs of swimmerets are hardened and much 

 crowded. There is but one pair of pincers, and these are 

 on the second pair of legs. The mouth-parts are the 

 same as in Gammarus, bat are more plainly seen. 



There are no pinoera on the fiiat pair of legs, bnt the section 

 above the last ia tnrned downward and the terminal claw bent 

 toward it, as if in the attempt to form pincers. An interesting 

 series may be made, beginning with thia rnde suggestion of a grasp- 

 ing organ, placing next the firat pair of pincers in Gammatas, 

 then the second pair in Gammiraa, and finally the second pair in 

 Oroheatia, in which the pincers bave attained their greatest size. 



