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BULLETIN 129, UNITED STATES NATIONAL MUSEUM 



inence almost entirely occupied by two protuberances, one at its mid- 

 dle and one at postero-lateral angle of carapace, which presents a 

 rounded or obliquely truncate outline. Sinus of postero-lateral margin 

 more shallow than in L. hicarinata. Margin of hepatic region with a 

 tubercle; of branchial region with several tubercles and a blunt tooth 

 at middle. Hepatic region nearly vertical. Front with a shallow 

 median emargination, from which the margin slopes obliquely back- 

 ward or is almost transverse; outer cor- 

 ners with a slight tooth, most produced 

 in the young. Preorbital tooth subacute 

 or obtuse. 



Chelipeds heavy in male; ischium with 

 tooth on inner margin ; merus with triden- 

 tate crest on superior margin ; carpus with 

 surface uneven, tubercle at inner angle. 

 Hands broad, compressed, widening dis- 

 tally, inner surface tuberculate; lower 

 margin of propodus with a sinus near its 

 middle; dactylus with acute upper mar- 

 gin; fingers gaping for basal half. Chel- 

 ipeds of female much smaller. Legs 

 cristate; crest of merus with a thin 

 triangular tooth at distal end; carpus with two triangular crests side 

 by side, divergent, forming a cup ; propodus with a triangular superior 

 crest, a tubercle on anterior and posterior surfaces, and with swellings 

 at articulation with dactylus. 



Measurements. — -Male, holotype, length 16.9, width 15.8 mm. 

 Female (21925), length 14.1, width 14.5 mm; female, (21927), length 

 12.3, width 11.5 mm. 

 Range. — Southern part of Gulf of California. 7 to 10 fathoms. 

 Material examined. — 



Gulf of California; April 30, 1888; Albatross: Lat. 24° 22' 30" 

 N.; long. 110° 19' 30" W.; 8 fathoms; brk. Sh.; station 2824; 2 males, 

 1 is holotype (21574). Lat. 24° 22' 15" N.; long. 110° 19' 15" W.; 

 7 fathoms; brk. Co.; station 2825; 1 male, 1 female (21925). Lat. 

 24° 12' 00" N.; long. 109° 55' 00" W.; 9H fathoms; Sh.; station 

 2826; 1 female (21926). Lat. 24° 11' 30" N.; long. 109° 55' 00" W.; 

 10 fathoms; Sh.; station 2828; 1 male, 3 females (21927). 



Fig. 107.— Lissa tdberosa (21927), max 

 illiped, x 19.5 



