. Bulletin - United States National Museum. Science. 18 BULLETIN 97, UNITED STATES NATIONAL MUSEUM. TRIZOCARCINUS DENTATUS (Rathbnn).» Plate 1. Carcinoplax dcntaUis Rathbtjn, Proc. U. S. Njit. Mus., vol. 16, 1893, p. 243, (type-locality, Culf of California, lat. 29° 40' 00" N.; long. 112° 57' 00" W., 76 fathoms; holotype, male, Cat. No. 17462, ). Trizocarcinus dcntatus Ratitbxin, Proc. U. S. Nat. Mus., vol. 47, 1914, p. 117, text-fig. 1, pi. 1. Diagnosis.—A pterygostoinian stridulating ridge. Merus of maxillipeds not broader than long. Segments of male abdomen free; third seg
. Bulletin - United States National Museum. Science. 18 BULLETIN 97, UNITED STATES NATIONAL MUSEUM. TRIZOCARCINUS DENTATUS (Rathbnn).» Plate 1. Carcinoplax dcntaUis Rathbtjn, Proc. U. S. Njit. Mus., vol. 16, 1893, p. 243, (type-locality, Culf of California, lat. 29° 40' 00" N.; long. 112° 57' 00" W., 76 fathoms; holotype, male, Cat. No. 17462, ). Trizocarcinus dcntatus Ratitbxin, Proc. U. S. Nat. Mus., vol. 47, 1914, p. 117, text-fig. 1, pi. 1. Diagnosis.—A pterygostoinian stridulating ridge. Merus of maxillipeds not broader than long. Segments of male abdomen free; third segment reaching coxae. Description.—Carapace about four-fifths as long as broad; pos- terior median portion almost level and bordered by a blunt ridge from which the anterior and lateral por- tions slope downward. Cardiac and mesogastric regions in part demarcated. Surface short-hairy, unequally granulate. Front bimarginate, deeply grooved; inner angle of orbit a subacute tooth. Three flattened, upturned, pointed and subequal antero-lateral teeth. Margins of teeth and orbit denticulate. Postero- Fio. 3.—trizocaucinus denta- lateral margins subparallel. Pterygosto- TUS, VENTRAL VIEW OP LEFT • • n 1 1 1 - >^n n SIDE OF CARAPACE OF MALE "^^^n ridge crosscd by about iO fine HOLOTYrE, SHOWING STRIDE- striaG. A short complementary ridge ex- LATINQ RIDGE, X 4. • j. 1 -1 • J! x1 ists on the lower proximal margin or the inner surface of the arm, and is crossed obliquely by 10 or 11 striae. Chelipeds granulate, outer face of carpus and chela clothed with long hair except tips of fingers. An upper marginal spine on merus at distal third; a lower subterminal spine. Inner spine of carpus curved upward. Chelae flattened, margins serrulate; fingers irregu- larly toothed, not gaping. Inner surface of propodus with a deeply concave surface below. Legs long and narrow; last three joints long, hairy, margins granulate. Third segment of male abdomen the widest, first and
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