STALK-EYED CRUSTACEA 69 



the antero-lateral edge has six spines ; the postero-lateral 

 edge has many spines. — {P. spinosissima^ 



C. The upper surface of the carapace has spines on 

 the cardiac region only ; the antero-lateral edge has four 

 spines ; the postero-lateral edge one spine. — (P. calata.) 



I. Pericera cornuta. 



Periccnx cornuta . . Milne Edwards, Miers. 



Cancer corniido . . . Herbst. 



Maia taurns . . . Lamarck. 



Horned crab .... Griffith Hughes. 



Carapace irregular, and without remarkable spines on 

 its upper surface, but armed along the edge with a row 

 of large, very long, sharp spines ; on the hepatic region 

 one, on the branchial region three, and one on the 

 intestinal region. The anterior angle of the superior 

 orbital border is prolonged into a strong spine, which 

 exceeds much the basal articulation of the external 

 antennae. The rostrum is styliform, very diverging, and 

 in length equals the breadth of the front. The basal 

 joint of external antenna:^ is armed in front with a small 

 spine which does not exceed the front ; the second joint 

 is cylindrical, slender, elongated, and inserted under the 

 rostrum ; the third is very small. 



The first pair of legs is cylindrical, of the size of, or 

 a little stronger and longer than, the succeeding pairs ; 

 arms spinous ; pincers thin. The other legs are of 

 moderate size, those of the second pair not being one 

 and a half times the length of the postfrontal portion of 

 the carapace. 



Body covered with a brownish down. Length three 

 to four inches. 



Range. — Barbados, Florida, Brazil. 



