. Bulletin - United States National Museum. Science. THE CANCROID CRABS OF AMERICA 63 AchelousspiniiuanaKiiiGShEY, Proc. Acad. Nat. Sci. Philadelphia, 1878, p. 320[5]. Achelous spinimanus sviithii Verrill,'^ Trans. Connecticut Acad. Sci.,vol. 13, 1908, p. 387, text-figs. 32 and 33, pi. 19, figs. 2, 2a; pi. 21, fig. 2 (type-locality, off Hatteras, Albatross station 2285; type not yet returned to United States National Museum. Diagnosis.—Lateral teeth 1 to 8 subequal; lateral spine not much longer than teeth in adult; two spines on manus; superior outer sur- face of manus with a longitudinal, tu
. Bulletin - United States National Museum. Science. THE CANCROID CRABS OF AMERICA 63 AchelousspiniiuanaKiiiGShEY, Proc. Acad. Nat. Sci. Philadelphia, 1878, p. 320[5]. Achelous spinimanus sviithii Verrill,'^ Trans. Connecticut Acad. Sci.,vol. 13, 1908, p. 387, text-figs. 32 and 33, pi. 19, figs. 2, 2a; pi. 21, fig. 2 (type-locality, off Hatteras, Albatross station 2285; type not yet returned to United States National Museum. Diagnosis.—Lateral teeth 1 to 8 subequal; lateral spine not much longer than teeth in adult; two spines on manus; superior outer sur- face of manus with a longitudinal, tuberculate ridge; posterior distal angle of merus of swimming legs armed with a spine. Description of large specimen.—Surface covered with a short close pubescence except on the elevated portions; and on the anterior sur- face of the merus of the ambulatory legs and on the sternum where the pubescence forms a regular pattern with the bare spaces. Cara- pace about 1% times as broad as long. Be- sides the customary ridges on gastric, car- diac and branchial regions, there is a curved ridge beginning behind the orbit and con- tinued along the base of the third to sixth lateral teeth. The teeth of the front and of the bidentate inner orbital angle form a regular arch. Frontal teeth spiniform, the sinuses U-shaped, the median sinus just equal to or a little narrower than the lat- eral; the lateral sinus is about the same width as but shallower than the sinus on the inner side of the inner orbital tooth; the inner branch of this tooth is spiniform, the outer branch an acute tooth. The upper margin of the orbit has a prominent denticle on the inner side of the outer fis- sure. Outer orbital tooth equilateral, suborbital fissure V-shaped, a marginal lobule on either side of it; inner infraorbital tooth more advanced than the front. The second to eighth antero-lateral teeth shallow, sharp-pointed, ninth or lateral spine half again as long as the preceding. Chelipeds heavy; four or fi
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