49 (43) Front with median tooth; antennules folding longitudinally Family Cancridae, Cancer ... A 



~&^T~^ 



Figure 90.— Cancer; A, frontal and orbital regions; B, antennules folded longitudinally. 



A (49) Anterolateral teeth of carapace with margins granulate; chelipeds granulate, 



not denticulate C. irroratus 



Figure 91.— Cancer irroratus; A, right anterolateral border; B. dactyl and upper border of chela. 



A (49) Anterolateral teeth of carapace with denticulate margins; upper margin of 



palm denticulate C. borealis 



Figure 92.— Cancer borealis; A, right anterolateral border; B, dactyl and upper border of chela. 

 49 (43) Front lacking median tooth; antennules folding transversely or obliquely 



50 



50 (49) Body transversely oval; fifth anterolateral tooth not enlarged and spinelike; legs not 



extremely long and slender (occur in shallow water) Family Xanthidae 



50 (49 ) Body nearly as long as broad; fifth 

 anterolateral tooth enlarged into lateral 

 spine (blunt in adult); legs extremely long 

 and slender; (usually occurs beyond con- 

 tinental shelf) 



Family Geryonidae, Geryon quinquedens 



Figure 93. — Geryon quinquedens; A, carapace and eyes of young; 

 B. orbital and anterolateral border of adult. 



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