THE CANCROID CRABS OF AMERICA 



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less advanced, not reaching the line of 

 the outer orbital teeth; the frontal teeth 

 blunt, not sharp, at tip; the inner of the 

 two teeth at the supra-orbital angle den- 

 tiform, not spiniform; merus of swim- 

 ming leg a little longer, its postero-distal 

 angle spinulous but not forming a lobe; 

 long spine of wrist straight, not curved, 

 in dorsal view, though sinuous in side 

 view. The only full-grown specimen in 

 hand lacks chelipeds except for a long 

 carpal spine. 



The type-specimen (female) is only 

 half grown; it is very deeply areolated, 

 presenting a very different appearance 

 from the full-sized male. The 

 antero-lateral teeth are wider, 

 the lateral spine longer. The 

 merus of the chelipeds has four 

 inner spines and a broader 

 postero-distal spine; the long 

 inner carpal spine just reaches 

 the distal third of the manus, 

 outer spine smaller than proxi- 

 mal spine of manus; superior 

 spine of palm at distal fifth of 

 margin. Three smaller speci- 

 mens (male) from as many 

 agree substantially mth the type. 



Measurements. — Male (17434), total 

 length of carapace 26.4, width of same 

 51.8, width at anterior base of lateral 

 spine 38.7, fron to-orbital width 20.6, 

 width of front 6.5 mm. Female holo- 

 type, total length of carapace 15, width 

 of same 35, width, at anterior base of 

 lateral spine 22, fron to-orbital width 12, 

 width of front 3.8 mm. 



Range. — Mexico: West coast of Lower 

 California and Gulf of California. 



Material examined. — See table, p. 97. 



Figure 14.— 



P0RTUNU3 



(Achelous) 

 ibidescens, 



FEU ALE, 

 TYPE, OUT- 

 ER MAXILI- 

 PED, X8 



localities 



79856—30- 



