THE SPIDER CEABS OF AMERICA 543 



crenulated teeth; inner edge with 18 to 20 very minute teeth. Legs 

 naked, compressed, without himiniform crests; merus of last pair 

 shghtly expanded below near base. Abdomen and sternum of male 

 coarsely pitted, othenvise smooth and glabrous. (After Stimpson.) 



Measurements. — Male (18678), length of carapace 5.5, width of 

 same 6.3, length of cheliped 16 mm. 



Range. — From Gulf of Mexico (west coast of Florida) to Florida 

 Keys, Bahamas, and Barbados. Depth, 30 to 115 fathoms. 



Material examined. — See table, page 542. 



Genus LEIOLAMBRUS A. Milne Edwards 



Leiolambrus A. Milne Edwards, Crust. R6g. Max., 1878, p. 148; type, 

 L. pundatissima (Owen) [spinosissima, by error]. 



Carapace hexagonal, considerably broader than long, with a strong 

 spine near middle of its lateral margin. Surface depressed, smooth, 

 or nearly so, with three low longitudinal elevations, one median, the 

 others branchial. Front subtruncate, with a minute median point. 

 Orbits with a closed fissure above, a large V-shaped fissure below 

 toward outside, and an inner hiatus in which is lodged the antenna. 

 Basal joint of antenna very small. Antennules folding almost longi- 

 tudinally. Buccal frame narrowing a little forward, loosely covered 

 by external maxillipeds ; these last have an anteriorly tapering ischium, 

 a merus with a semicircular antero-external outline, antero-internal 

 angle rectangularly notched; merus and ischium of the endognath 

 bordered with long hairs which form a ventral covering to the afferent 

 channels of the branchiae; exognath concealed above endognath. 

 Chelipeds very long, sharply trigonal, somewhat subequal; marginal 

 teeth small and numerous. The fingers gape in the larger claw. 

 First pair of ambulatory legs the shortest. 



Known only from the two species here described. 



KEY TO THE SPECIES OF THE GENUS LEIOLAMBRUS 



A'. Carapace with four strong marginal spines behind punctatissimus, p. 543. 



A^. Carapace with no strong marginal spines behind nitidus, p. 545. 



Analogous species on opposite sides of the continent: nitidus 

 (Atlantic) ; punctatissimus (Pacific) . 



LEIOLAMBRUS PUNCTATISSIMUS (Owen) 



Plate 198 



Parthenope punctatissima Owen, Zool. of Beechey's Voy., 1839, p. 81, pi. 



24, fig. 4 (type-locality, coast of California; type not extant). — Stimpson, 



Boston Journ. Nat. Hist., vol. 6, 1857, p. 458 [18]. 

 Parthenope (Lamhrus) punctatissima Lockington, Proc. California Acad. 



Sci., vol. 7, July 17, 1876 (1877), p. 78 [16]. 

 Leiolambrus spinosissima (by error) A. Milne Edwaeds, Crust. R6g. Max., 



1878, p. 148. 



