h. Third and fourth teeth of anterolateral border definitely pointed forward with outer borders curved, 

 i. Tooth at base of major dactyl large and conspicuous; body definitely arched above. Panopeus (p. 196). 

 ii. Tooth at base of major dactyl present but often not large and conspicuous; posterior two-thirds 



of carapace flattened above Eurypanopeus (p. 194). 



hh. Third and fourth teeth of anterolateral border triangular and pointing outward or slightly for- 

 ward, outer borders not conspicuously curved Hexapanopeus (p. 188). 



gg. Major cheliped with no tooth at base of dactyl, or with obsolescent tooth little if any larger than adjacent 

 teeth. 



h. A red spot on internal face of ischium of third maxillipeds Eurypanopeus (p. 194). 



hh. No red spot on internal face of ischium of third maxillipeds Neopanope (p. 190). 



ff. Carapace with regions on dorsum obsolete; carapace smooth to unaided eye. 



g. Fingers white; anterolateral teeth pointed or rounded Eurytium (p. 199). 



gg. Fingers black; anterolateral teeth broad, not pointed, with occasional exception of most lateral tooth; 



often attains large size Menippe (p. 183). 



ee. Teeth of anterolateral border usually distinctly spiny or spiniform; sometimes subtriangular, serrated or 

 with spiny tips, and with carapace more or less nodose (nodes occasionally small), 

 f. Carapace nearly devoid of hairs and with nodose areas on front and anterolateral portions usually clearly 



evident, though sometimes poorly developed; adult size small Micropanope (p. 192). 



ff. Carapace with either long, plumose hairs, numerous short hairs, or both. 



g. Carapace and chelipeds variably spiny; not nodose; with long plumose (clubbed) hairs, short hairs, or 



both Pilumnus (p. 177). 



gg. Carapace with patches of nodules on anterolateral margins extending back from front; with close pile 

 of short hair only; body massive, thick Lobopilumnus (p. 181). 



Genus Pilumnus Leach, 1815 



Rathbun, 1930a, p. 481. — Hemming, 1958b. p. 35. 



KEY TO SPECIES IN THE CAROLINAS 



a. Hair not covering whole carapace or not forming so 

 thick a coat as to conceal surface beneath. 



1>. Two or more superhero tic spines sayi (p. 177). 



bb. No superhepatic spines dasypodus (p. 178). 



aa. Hair covering whole carapace and forming a thick 

 coat concealing surface beneath (hair sometimes worn 

 off), 

 b. Chelipeds spinose above ; a transverse row of long 



hairs across front floridanus (p. 179). 



bb. Chelipeds not spinose above ; carapace tuberculate, 

 but tubercles often sparse and low. 

 c. Tubercles of carapace not numerous nor promi- 

 nent, upper margin of orbit not spinose 



lactew (p. 180). 



cc. Tubercles on anterior half of carapace and upper 



surface of chelipeds numerous, upper margin of 



orbit with truncate spines (but occasionally these 



poorly developed ) pantwsus (p. 181). 



Pilumnus sayi Rathbun. Hairy crab 



Figures 157 A, B ; 158 



Cancer aculeatus Say, 1818, p. 449. 



Pilumnus sayi Rathbun : 1897b, p. 15. — Hay and Shore, 1918. 

 p. 440, pi. 35. fig. 4.— Rathbun, 1930a. p. 484, pi. 200, figs. 1-2; 

 pi. 201, figs. 4-7 (rev.). 



Recognition characters. — Carapace about three- 

 fourths as long as wide, anterior half semicir- 

 cular, strongly deflexed, sparsely covered with 

 long filiform and plumose hairs. Anterolateral 

 border with four marginal spines including outer 



orbital ; two curved spines on hepatic region with 

 sometimes one, two, or three supplementary 

 spines; one long spine and sometimes spiniform 

 tubercles between first and second marginal spines 

 below margin. Orbit armed with three long spines 

 above, and four long and two to four short spines 

 below. Front advanced, deeply notched in center, 

 less so on each side, armed with about four spines 

 on each side. 



Superior surfaces of chelipeds and walking legs 

 with many filiform and plumose hairs; carpal and 

 propodal articles most thickly covered and with 

 several strong spines as well. Chelipeds large, 

 unequal ; carpus with 15 or 20 erect dark spines ; 

 spines of hand strong and acute above but be- 

 coming smaller on external surface, spines tending 

 to arrangement in rows on large hand; fingers 

 ribbed, dark, and with obtuse teeth ; dactyl spiny 

 above at base. 



Measurements. — Carapace: male, length, 23 

 mm.; width, 32 mm. 



Variations. — The specimen taken on Frying 

 Pan Shoal off North Carolina (Charleston Mu- 

 seum No. 38.228) reported by Lunz (1939) ap- 

 pears to be an aberrant specimen of Pilumnus 

 sayi rather than P. marshi. The specimen lacks 

 superhepatic spines on the carapace but other- 

 wise more nearly resembles P. sayi than any other 

 Western Atlantic species of Pilumnus. 



MARINE DECAPOD CRUSTACEANS OF THE CAROLINAS 



177 



