THE SPIDER CRABS OF AMERICA 373 



orbital distance narrow, less than half the width of the carapace. 

 Five large, lateral teeth, flat and broad, except for the sharp tips 

 which are curved forward and a little inward; the third and fourth 

 teeth are the largest, the first and second nearly as large, the second 

 ■and third slightly united at the base; last sinus widest. Orbital 

 teeth blunt or nearly so. Rostral teeth subacute, interspace tri- 

 angular, a little narrower than either tooth. The branchial and 

 intestinal regions are covered with flattened granules, but sometimes 

 appear almost smooth; the remainder of the carapace is covered 

 with punctae or scalelike granules, from which proceed hairs. 

 Gastro-branchial groove deep. 



The lobe of the first movable segment of the antenna points 

 forward, its outer margin is strongly curved. 



Measurements. — Female (.53051), entire length of carapace 33, 

 entire width 34, width exclusive of spines 30, fronto-orbital width 

 15 mm. Male (type), entire length of carapace 34.8, entire width 

 40.8, width exclusive of spines 33, fronto-orbital width 16.2, length of 

 merus of cheliped 21.5, width of same at middle 4.6 mm. 



Range. — West coast of Florida southward to north coast of 

 South America. 



Material examined. — 



St. Martins section, Florida; lat. 28° 34' 45" N.; long. 83° 08' 

 00" W.; 5M fathoms; Co. R. Grass; temp. 12.5° C; January 15, 

 1902; station 7221, Fish EawTc; 1 female, variety (46765). 



Antilles; 1 male, holotype (Paris Mus.). 



Sabanilla, Colombia; 1884; Albatross; 1 immature female (15820). 



Chaguamdus Bay, Trinidad; W. O. Crosby; received from Boston 

 Soc. Nat. Hist.; 2 ovigerous females (53051). 



Locality not known; 1 carapace, cotype of Cancer mirahilis 

 (Herbst), (BerhnMus.). 



Variations. — In the old females the posterior of the lateral teeth 

 is in advance of the line of the gastro-cardiac suture. In the young 

 female (15820), the line of that suture if prolonged would cross the 

 posterior teeth; in this little specimen also the first and third teeth 

 are subequal and larger than the others. 



Most interesting is the female from the west coast of Florida 

 (46765) which appears to represent a variety of P. laevigata. It 

 differs from the typical form as follows: The second lateral tooth is 

 much smaller than any of the others; it is slender, nearly straight, 

 and as in typical laevigata, slightly united to the third tooth. The 

 distance between the tips of the first and third teeth is less than 

 between the third and fourth. The tips of the orbital teeth are 

 more acute and are a little curved. 

 5487—251 26 



