No. 436.] 



NORTH AM ERICA X INVERTEBR 



M. Cape Cod to Hatteras. 

 S. Hatteras to Florida. 



The Amphipoda may be defined as malacostr 

 with a well-defined head, no carapace, sessile a 

 pound eyes, a thorax of seven segments, ai 

 consisting typically of six segments and a telsoi 

 borne on the inner side of the basal joints of tl 

 The first three abdominal appendages are fittec 

 the last three pairs are very different from the 

 and are directed backward and fitted for sprin< 

 are carried in a marsupial pouch under the thon 



The term peraeopod is here used to designate 

 behind the first two pairs, or gnathopods. 



The Amphipoda fall into three main division 

 separated as follows: 



