462 



ALLAN HANCOCK PACIFIC EXPEDITIONS 



VOL.21 



Genus LEIOLAMBRUS A. Milne Edwards 



Leiolambrus A. Milne Edwards, 1878, p. 148. Rathbun, 1925, p. 543. 



Type: Parthenope punctatissima Owen [by error spinosissima], by 

 original designation. 



Description: Carapace smooth as that of Solenolambrus, but gastric 

 and cardiac regions not elevated in form of a pyramid. Exognath of the 

 external maxillipeds presenting on the outside a border of serrate hairs 

 covering the afferent channel of the branchial chamber. Fingers of the 

 chelae larger than those of Solenolambrus. (A. Milne Edwards, 

 modified) 



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 lodging the antenna. Basal [article] of antenna very 

 small. Antennules folding almost longitudinally. Buccal frame narrow- 

 ing a little forward, loosely covered by external maxillipeds; these last 

 having an anteriorly tapering ischium, a merus with a semicircular ante- 

 roexternal outline, anterointernal angle rectangularly notched ; merus 

 and ischium of the endognath bordered with long hairs forming a 

 ventral covering to the afferent channels of the branchiae ; exognath con- 

 cealed above endognath. 



Chelipeds very long, trigonal, somewhat subequal ; marginal teeth 

 small and numerous. The fingers gaping on the larger claw. First pair 

 of ambulatory legs the shortest. (Rathbun, modified) 



Range: Eastern Pacific from Pt. Tosco, Lower California, and 

 Guaymas, Gulf of California, Mexico, to Salango Island, Ecuador. 

 Western Atlantic from Jamaica and Puerto Rico. 12-45 fathoms. 



Leiolambrus punctatissimus (Owen) 

 Plate Z S) Figs. 10, 10a; Plate 52, Fig. 2 



Parthenope punctatissima Owen, 1839, p. 81, pi. 24, fig. 4. Stimpson, 



1857b, p. 458. 

 Parthenope (Lambrus) punctatissima, Lockington, 1877c, p. 78. 



Leiolambrus punctatissima, A. Milne Edwards, 1878, p. 148 ["spino- 

 sissima," by error], p. 159. 



