THE SPIDER CRABS OF AMERICA 381 



F". Lateral margins of carapace with lumpy protuberances. Wrist 

 tuberculate above, five tubercles on inner margin_bellii, p. 403. 

 D^. Carapace not paved with close-set granules or tubercles. 



E^ Six or more antero-lateral spines or spinules. Chelipeds and am- 

 bulatory legs elongate pygmaeus, p. 406. 



E'. Four or three antero-lateral spines or spines and tubercles. 

 F'. Carapace nearly smooth; marginal spines simple. 



braziliensis, p. 404. 



F^. Carapace more or less lumpy; marginal spines more or less 



complex, either with a secondary spine or accessory tubercles. 



G^ Onh' two spines, lobes or teeth on basal segment of antenna. 



H'. A spine on, or just above, postero-lateral margin of carapace. 



J^ Carapace with areolations smooth (non-granulate). Three 



curved spines on antero-lateral margin of branchial 



region. 



K'. Two parallel and nearly transverse rows of well marked 



tubercles and spines on postero-lateral region. 



caribbaeus, of small or medium .size, p. 409. 



K^. One row of not more than two or three well marked 



tubercles and spines on postero-lateral region. 



Prehensile edges of fingers of ver\^ old specimens 



entire, not crenulated, in the gape, except on the 



tubercle hispidus, p. 406. 



J^. Carapace wath areolations granulate. Two large lobes and 

 a spine on antero-lateral margin; the first lobe hepatic. 



tuberculatus, p. 418. 

 H^. A tubercle, instead of a spine, on, or just above, postero- 

 lateral margin of carapace. 

 J'. Carapace very wide, the anterior, marginal, branchial lobe 

 striking!}' protuberant. Postero-lateral slope of cara- 

 pace smooth, behind the row of two conical tubercles 

 which leads obliquely inward from the spine at the 

 lateral angle. Rostral sinus V-shaped_-tortugae, p. 417. 

 J-. Carapace narrower, the anterior, branchial protuberance 

 not strikingly prominent. Postero-lateral slope of cara- 

 pace rough with a few tubercles or granules. 

 K^ A well-marked, postero-lateral tubercle present, which 

 is the outermost of a transverse row of three, this 

 row having a similar row in front of it. Prehensile 

 edges of fingers crenulated along the gape. Rostral 



sinus U-shaped caribbaeus, large, p. 409. 



K2. An almost transverse row of two large tubercles leads 

 inward from the spine at the lateral angle; the tuber- 

 cles behind and immediately in front of it are all 

 very small, or granules. Rostral sinus V-shaped in 



young, U-shaped in old pleuracanthus, p. 411. 



G^. Three spines on basal segment of antenna. 



HI. Lateral spines of carapace simple. Wrist smooth except 



for a lobe on inner margin laevimanus, p. 419. 



H^. Lateral protuberances of carapace not simple. Wrist 

 granulate, three or four granules on inner margin. 



sinensis, p. 419. 



