ARTHEOPODA 



241 



Suborders 



BRACHYURA 



(Abdomen shorter than 

 cephalothorax, and perma- 

 nently folded vnder it; eyes 

 inclosed in orbits; anten- 

 nule.t and antennce small) 



Families Genera 



I Carcinides 

 PORTUNIMS callinectes 



(Swimming crabs) 



CANCROIDS 



OCYPODID^E 

 (Sand- and fiddler-crabs ) ^ j- T 



Cancer 



Menippe 

 Eupanopeus 

 Eurypan opens 

 Neopanopeus 

 Rhithropan opens 



S Hemigrapsus 



( Paeygrapsus 

 f Ocypoda, 



(Libinia 

 Hyas 



MAIID^E 



(Spider-crabs) 



Stern orh yn eh us 

 Eplaltus 

 Pitho 

 Lambrus 



CALAPPID^E Calappa 

 PINNOTHERUD^E Pinnotheres 



Species 

 C. mcenas 

 C. sapMus 

 O. ocellatus 

 C. irroratus 

 C. borealis 

 C. magister 

 C. producing 

 C. antennariiis 

 37. inercetHiria 

 E. herbstii 

 E. depresxu* 

 N. texana 

 It. harrisii 

 //. nndns 

 H. oregonettftis 

 P. crassipes 

 O. arena fi<i 



t U. minax 



\ U.pugnax 



( U.pugilator 



{ L. dnbia 



I L. emarginata 



JH. coarctatus 

 H. lyratus 

 If. araneiis 

 L. crispatus 

 P. gracllis 

 S'. Sagittarius 

 E. prod net us 

 P. acnleata 

 L. ponrtalesii 

 C. flam-ma 

 P. ostreum 



16 



Order STOMATOPODA 



(Abdomen very large; second pair of thoracic legs very large; gills borne 

 on abdominal segments) 



SquiUa S. empusa 



