STALK-EYED CRUSTACEA 



471 



Family 

 Family 

 Family 

 Family 

 Family 

 Family 



Atytidcc. 



I. Atyidse. 



II. Acanthephyridae. 



III. Palaemonidce. 



IV. Nematocarcinidae. 

 V. Tropiocaridse. 



VI. Stylodactylidse. 



Family VII. Pasiphaeidae. 



Synopsis of the Families. 



I. The two first pairs of 

 legs armed with pincers. 



A. The three posterior 

 pairs of legs are not very 

 short nor imperfectly formed. 



a. Finger and thumb of 

 pincers spoon-shaped. Telson 

 truncate. — {Atyidcs). 



b. Carapace dorsally carinated. In- 

 ternal antennae have two flagella. First 

 two pairs of legs subequal. — {Acautlie- 

 phyridce) 



c. Carapace dorsally rounded. 

 Usually three flagella on internal 

 antennae. Second pair of legs 

 usually the largest. — {Palcernonidcp). 



d. Body smooth. Two long 

 slender flagella on internal an- 

 tennae. The fifth joint of the legs are much longer than 

 the sixth joint. First two — ,_ 



pairs of legs long and slender. ^osii^iii^ 



— {Nematocarcinidce^ ^""^ ' 



e. Carapace dorsally com- 

 pressed. Rostrum short. Two 

 flapfella on internal antennae. Ncmatocarciuidie, 



Acaiithephyridcs. 



Rostrum compressed. 



Pahcuioitida. 



