Genus Spiropagurus Stimpson, 1858 



Stlmpson, 1858, p. 236. — Milne Edwards and Bouvier, 1893, 

 p. 110.— Alcock, 1905, p. 117. 



Spiropagurus dispar Stimpson 



Figure 108 



Spiropagurus ditpar Stimpson, 1858, p. 236 [nomen nudum]. — 

 1859, p. 88. — Provenzano, 1961, p. 165. 



Figure 108. — Spiropagurus dispar Stimpson. A, anterior 

 part of body in dorsal view ; B, right chela, outer sur- 

 face ; 2 mm. indicated. 



Recognition characters. — Carapace smooth but 

 with hairy tracts on subcordate anterior shield 

 and especially on anterior portion of membranous 

 branchial areas; anterior margin with broadly 

 rounded rostrum and equally advanced, acute 

 lateral projections. Eyestalks more than twice as 

 long as basal width, slightly exceeding proximal 

 end of terminal articles of antennal and antennu- 

 lar peduncles, much dilated distally, cornea large; 

 eye scales triangular, with abruptly narrowed 

 acute tip directed slightly laterad, and slightly ex- 

 ceeded by strong subterminal spine. Acicles slen- 

 der, longer than eyestalks. 



Chelipeds elongate, setiferous, right chela 

 larger than left. Major cheliped with fingers one- 

 third to one-half length of palm, cutting edges of 

 fingers toothed; palm ornamented with a dorsal, 



submarginal row of distinct spines on each side; 

 carpus shorter than palm with scattered spines 

 dorsally; merus with a single spine on internal 

 anterior border, and a short row of spines on 

 corresponding external border. Minor cheliped 

 similar but narrower; palm less spiny, and fingers 

 with a row of fine denticles on opposed edges. 

 Anterior two pairs of walking legs elongate, 

 slender distally, somewhat less pubescent than 

 chelipeds; dactyls not dilated noticeably at base; 

 carpi with a low crest of spines. 



Left vas deferens of male prominent and coiled 

 in a loose spiral. 



Measurements. — Length of carapace: male, 5 

 mm. 



Color. — Anterior carapace with three pairs of 

 pigment spots, anterolateral vertical flaps light 

 brown with a large, clear or colorless spot ; cornea 

 deep brown, eyestalks brown dorsally and ringed 

 with brown near base; a narrow brown-orange 

 ring at middle of fingers and at edge of immov- 

 able finger, hands reticulated with brown on up- 

 per surface; walking legs with a broad brown 

 band on dactyls; propodi with a dorsal and ven- 

 tral brown patch, a faint longitudinal lateral 

 stripe, and a pair of dorsomedial brown patches; 

 carpi with three faint stripes laterally (Proven- 

 zano, 1961, from specimen preserved in formalin). 



Habitat. — The species has been found housed in 

 Natica canrena Linne; 5 to 100 fathoms. 



Type locality. — Barbados. 



Known range. — Off South Carolina ; Virgin Is- 

 lands; Barbados. 



Remarks. — Ovigerous females have been taken 

 from the Virgin Islands in April and September 

 (Provenzano, 1961). 



Genus Pylopagurus Milne Edwards and Bou- 

 vier, 1893 



Milne Edwards and Bouvier, 1893, p. 74. 



KEY TO SPECIES IN THE CAROLINAS 



a. Large chela almost smooth on upper surface, border 

 finely crenulate; abdomen straight- -discoidalis (p. 134). 

 aa. Large chela more or less tuberculate on upper sur- 

 face, border definitely toothed ; abdomen coiled, 

 b. Outer surface of chelae nearly flat, not conspicu- 

 ously tuberculate ; rostrum exceeding unarmed lateral 



projections of front corallinus (p. 134). 



bb. Outer surface of chelae conspicuously convex, con- 

 spicuously tuberculate ; rostrum about equal to 

 prominent minutely armed lateral projections of 

 front rosaceus (p. 135). 



MARINE DECAPOD CRUSTACEANS OF THE CAROLINAS 

 703-049 0—65 10 



133 



