348 



48 



margin where il is nearly one-third as wide as carapace; epistome complete though 

 narrow; legs narrower than in T. orientalis. 



Founded on a young male, in which only the last segment of the cJ" abdomen 

 is distinctly separated. 



Length 35 mm., width 48 mm., width across front and orbits 25 mm., greatest 

 width of front 15 mm. 



Type locality. — Koh Chuen, 30 fathoms, shell bottom; II; 1 d". 



Lambdophallus anfractus Rathbun. 



Lambdophallus anfractus Hathbun, Pioc. 3iol. Soc. Washington, XXU, 113, 1909. 



Carapace subquadrilateral with the anterior angles rounded, one-half broader 

 than long, convex fore and aft, anteriorly deflexed, slightly convex from side to 

 side, gastric and cardiac regions well defined, surface shorl-pubescent and finely 



granulate and punctate. At the postero- 

 lateral corners there is a small but very 

 well marked lobe. 



Front nearly vertically deflexed, 

 about one-fifth as broad as the greatest 

 breadth of the carapace, subtruncate 

 with the outer angles rounded , and 

 with a median groove which bilobes 

 the front in a dorsal view. 



Orbit oblong-oval, about as wide 

 as each lobe of the front and inclined 

 downward and outward in a front view. 

 Eyes almost immovable, pigmented. 



Antennules transverse, septum 

 narrow. Antennæ more than twice as long as the major diameter of the orbit. 



Epistome well defined. The buccal cavity narrows anteriorly. The inner 

 margin of the ischium-merus is very convex, so that the space between the ischium 

 joints is very nearly filled by the palpi, the propodal joint of which is less enlarged 

 than in the type species L. sexpes (cf. pi. LXII, fig. la. Illus. Zool. Investigator, 

 Crust., pt. X). There are several fine oblique raised lines near the buccal cavity. 

 Chelipeds unequal in the c?, equal in the Ç, the larger one in the J" one and 

 one-half times as long as the carapace, finely granulate, fingers meeting only at 

 tip, a low molariform tooth at base of dactyl. 



Legs tomentose and granulate, third pair longest, a little more than twice as 

 long as carapace, first pair shortest and narrowest, merus joints longitudinally furrowed. 

 Sternum finely granular; in the first segment is a transverse sinuous trench, 

 to hold the curved and projecting extremities of the abdominal appendages. 



The narrow c? abdomen has the first two segments short, no suture lines 

 visible between the third, fourth and fifth segments, sixth segment nearly as long 



Fig. 36. Lambdophallus anfractus, 



type (S, 7'2 mm. wide: a, sternum and abdomen; 



b, abdominal appendages; c, maxilliped. 



