1921 ] Schmitt: The Marine Decapod Crustacea of California 157 

 Lopholithodes foraminatus (Stimpson) 



Plate 21, figure 2 



Echinocerus foraminatus Stimpson, Ann. Lye. Nat. Hist. N. Y., 7, 79, 1859 

 (1862) ; Neweombe, Bull. Nat. Hist. Soc. Brit. Col., p. 27, pi. 3, 1893. 



Lopholithodes foraminatus Holmes, Occas. Papers Calif. Acad. Sci., 7, 130, 

 1900. 



Fig. 102. Lopholithodes foraminatus, dorsal view of carpus of chelipeds, J 1 , 

 X nearly y± (after Neweombe). 



Characters. — Carapace depressed; gastric region elevated, furnished with a 

 short, sharp, conical tubercle near the middle and a group of smaller tubercles near 

 posterior end; cardiac region with a few short, subconical tubercles; from posterior 

 gastric region an irregular line of tubercles extends to the posterolateral angles 

 of the carapace; external to the orbits there are three spines in a nearly trans- 

 verse line, behind which the anterolateral margin is at first concave and then 

 strongly convex ; the spines on the convex portion of the margin are large and 

 subconical; behind the convex portion the margin is concave and devoid of spines; 

 posterior margin arcuated and studded with conical tubercles. Bostrum rather 

 short, with median spine, and cluster of spiny tubercles above the base. Tubercles 

 of chelipeds and ambulatory legs spinif orm ; carpus of chelipeds with outer edge 

 excavated, forming a smooth, deep, rounded sinus, which when approximated to 

 the shallower corresponding sinus on the anterior edge of the carpus of the first 

 pair of ambulatory legs forms a striking, smooth, nearly circular hole, or foramen, 

 from which this species derives its name and by which it is distinguished from 

 all others. Abdomen similar to that of L. mandtii. 



Dimensions. — Type: length of carapace 132.1 mm., width 214.9 mm. 



Type Locality. — Off the coast of California, near San Francisco. 



Distribution. — Victoria, British Columbia, to off San Diego, California, to a 

 depth of 299 fathoms. 



Bemarlcs. — Easily recognized by the remarkable foramen between the chelipeds 

 and the first ambulatory legs (Holmes). 



Genus Rhinolithodes Brandt 



Carapace triangular, with a deep semilunar fossa separating the smooth hemi- 

 spherical cardiac region from the other regions of the carapace, which are roughly 

 and more or less coarsely tuberculate, and raised above the cardiac region. Plates 

 of basal (second), and three following abdominal segments distinct. 



