52 Bulletin, VanderhUt Marine Museum, Vol. Ill 



The external maxillipeds have the ischium armed with teeth on the 

 inner lateral margin; the merus is narrower; the three-jointed palp 

 is stocky. 



The chelipeds are moderately unequal, the right being the larger; 

 the ischium is elongated, produced to an acute point on its under dis- 

 tal side and with three or four stocky spines on its outer face; the 

 merus reaches as far forward as the rostrum and is compressed cylin- 

 drical, roughened with coarse granules and armed with eight or nine 

 thorn-like spines on the upper surface, the longest of which is placed 

 subdistally at the inner angle ; the carpus is three-fourths as long as 

 the merus, and wider on the slightly convex upper surface, which is 

 armed with about a dozen spines, the three decidedly longest of this 

 series being placed along the proximal half of the inner lateral mar- 

 gin; the palm of the larger cheliped is about as long as the carpus 

 but slightly wider distally and armed on the outer face with 15 to 

 20 spines which become larger along the superior margin. The fingers 

 are about as long as the palm, subequal, with an elliptical gape, the 

 tips meeting; the lower finger with two or three molariform teeth, 

 the upper finger with one large and several small teeth; numerous 

 clusters of bristly setae along the margin of the cutting edge of both 

 teeth. The smaller cheliped resembles the larger but is less dilated 

 in the palm. 



The second, third and fourth legs are of similar structure and sub- 

 equal in length ; each has the merus seven-eighths as long as the maxi- 

 mum width of the carapace; the carpus is half as long as the merus 

 and slenderer; the propodus is about one and three-fourths times as 

 long as the carpus and equally slender ; the dactyl is five-sixths as long 

 as the propodus, tapering, acuminate, sickle-shaped, with three or 

 four spines proximally, the tip acute, spine-like. The distal end of 

 the ischium, the upper and especially lateral borders of the merus, 

 carpus and propodus are furnished with a series of long, thorn-like 

 spines, those of the meral borders being the largest. 



The fifth legs are characteristically weak, folded within the branch- 

 ial cavity. 



Synonymy. — Cancer maja Linne, Syst. Nat., vol, 1, No. 1046, p. 41, 

 Ed. Tenth ; Twelfth Ed., No. 2031, 1768.— Herbst, Naturg, Krab- 

 ben u. Krebse, vol. 1, p. 219, tab. 15, fig. 87, 1788. 

 Cancer horridus Pennant, Brit, Zool., vol. 4, p, 7, pi. 7, fig. 14, 1771-78. 

 Inachus maja Fabricius, Suppl. Ent. Syst., p. 358, 1795. 

 Lithodes arctica Latreille, Gen. Crust, et Insect., vol. 1, p, 40, 1802. 



