544 



BULLETIN 12% UNITED STATES NATIONAL MUSEUM 



Leiolambrus pundatissima A. Milne Edwards, Crust. Reg. Mex., 1878, p. 



159. 

 Leiolambrus punctatissimus Holmes, Occas. Papers California Acad. Sci., 



vol. 7, 1900, p. 46, 



Diagnosis. — Carapace with four strong marginal spines behind; 

 lateral spine of moderate size. Orbit much narrower than rostrum. 

 Five or six enlarged teeth on anterior margin of arm. 



Description. — Carapace smooth, convex, minutely punctate, me- 

 dian gastric and cardiac regions forming a nearly continuous, longi- 

 tudinal elevation, bounded on either side by a conspicuous, longi- 

 tudinal depression. Front truncate, but with a small median tooth 

 behind which there is a short, longitudinal groove, Postorbital angle 

 acute. Antero-lateral margins slightly arcuate, and furnished with 



teeth wliich become very small toward an- 

 terior end. Sides of carapace produced into 

 a prominent, triangular tooth. Two teeth 

 on posterior margin near median line; ex- 

 ternal to these a pair of larger marginal 

 teeth; margins between teeth of external 

 pair and lateral angles of carapace concave. 

 Posterior andpostero-lateralmarginsmarked 

 with a delicate, raised, jagged line; another 

 fine raised line runs upon the branchial 

 region from postero -lateral tooth. Maxilli- 

 peds smooth, ischium narrowed distally, 

 antero-intemal angle produced forward in 

 a rounded lobe; merus broadly rounded at 

 antero-external angle and produced behind 

 articulation of palp. Chelipeds long, angles 

 denticulated; anterior edge of merus also 

 with several larger denticulated teeth; 

 outer edge of carpus dentate. Immovable 

 finger nearly longitudinal and straight, inner edge dentate; dactyl 

 curved and provided on external portion of base with two converg- 

 ing denticulated ridges which meet not far from tip. Legs smooth, 

 compressed, differing little in length; dactyls lanceolate, flattened in 

 a plane oblique to that of the preceding joints. The transverse ele- 

 vations of first three segments of abdomen are finely denticulate and 

 are produced at extremities in a tooth. (After Holmes.) 



Measurements. — Male (18180), median length of carapace 13.2, 

 width 18.7, length of cheliped, below, about 40 mm. 



Range. — ? California; Gulf of California, Mexico. The records for 

 California are indefinite and may refer to Lower California. 



Fig. 149.— Leiolambrus punctatis 

 simus (17366), maxilliped, x 19.2 



