OXYSTOMATOUS AND ALLIED CRABS OF AMERICA 271 



of orbit more prominent than inferior. Basal article of outer antenna 

 free and movable; second article not reaching beyond the front; 

 flagellum longer than twice length of first three articles. Second and 

 third ambulatories subequal, exceeding the others in length. 



Western Europe; Nova Scotia to Brazil; Bermudas; southern 

 Africa; Indian Ocean; East Indies; Japan. 



GERYON QUINQUEDENS Smith 



Deep Sea Red Crab 

 Plates 85, 86 



Geryon quinquedens Smith, Trans. Connecticut Acad. Arts and Sci., vol. 5, p. 35, 

 pi. 9, figs. 1, la, lb, 2, 1879 (type localities, off Casco Bay, Maine, and off 

 Massachusetts Bay, Gulf of Maine; cotypes in U. S. N. M. and P. M. Y. U.). 



Diagnosis. — Five anterolateral teeth; four acute frontal teeth; a 

 strong spine at inner angle of carpus of cheliped and a very small 

 spine on distal margui ; a small spine near distal end of upper margin 

 of merus. 



Description. — Carapace of larger specimens, including lateral spines, 

 about one-third broader than long. Dorsal surface very convex 

 longitudinally but only sUghtly transversely, entirely naked, finely 

 but irregularly granulated, and not deeply areolated. The most 

 prominent elevation is a short, rounded, transverse ridge each side, 

 between the base of lateral spine and the posterior portion of the 

 gastric region. Breadth of front between tips of mner angles of 

 orbits equaling width of orbits. Median teeth of front near together, 

 triangular, and defiexed below the level of inner angles of orbits, in 

 front of which they project for almost or quite their whole length. 

 Outer angles of orbits acutely angular. The next tooth (the second 

 of the five anterolateral teeth) is a well-developed angular projection 

 of the margin, but less prominent than the first and not acutely 

 angular. Thhd tooth prominent, acutely triangular, scarcely spini- 

 form. Fourth tooth represented by a distinct but only slightly 

 angular emargination. Posterolateral margins nearly straight. In 

 young specimens the three larger anterolateral teeth are more acute 

 and spiniform than in larger specimens. Inner angle of inferior 

 margin of orbit triangular, not slender, falhng short of either of the 

 other orbital angles and reaching but slightly beyond third segment 

 of antenna. 



Chelipeds slightly unequal and rather slender. The fingers on 

 each hand are about as long as basal portion of propodus and their 

 thin prehensile edges are armed with sharp serrations which slightly 

 overlap when the dactylus is closed; a small obtuse tubercle near 

 base of larger dactylus. 



80232—37 10 



