154 University of California Publications in Zoology (Vou. 23 
Genus Cryptolithodes Brandt 
Carapace transverse, broadly oval, nearly smooth, high in the middlé, and later- 
ally produced into wide expansions which completely conceal the ambulatory legs, 
forming a large, expanded dorsal shield. Abdomen flattened, triangular, fitting 
neatly into a depression of the sternum; behind the entire basal (second) segment 
the abdomen bends abruptly; the three following segments are divided into a 
median row of plates, with a series of lateral plates on either side; penultimate 
segment is devoid of lateral plates, and conceals the minute triangular telson. 
KEY TO THE CALIFORNIA SPECIES OF CRYPTOLITHODES 
I. Hands tubereulated. Rostrum narrowing distally, end rounded, without dis- 
tinct anterolateral angles. Abdomen crossed by transverse ridges. (Not 
known south of Monterey.) 
typicus, p. 154. 
II. Hands smooth. Rostrum widened toward distal end, which is transverse, with 
distinct antero-lateral angles, and often but not always with a small median 
tooth. Abdomen smooth. (Not known south of Pacifie Grove.) 
sitkensis, p. 155. 
Cryptolithodes typicus Brandt 
Plate 20, figures 1 and 2 
Cryptolithodes typicus Brandt, Bull. Phys.-Math. Acad. St. Petersb., 7, 
185, 1849, 11, 254, 1853; Stimpson, Jour. Boston Soc. Nat. Hist., 6, 
572, pl. 19, 1857; Holmes, Occas. Papers Calif. Acad. Sci., 7, 124, 
1900; Rathbun, H. A. E., 10, 164, 1904; Way, Puget Sd. Mar. Sta. 
12MoleS als Bora, sales 5 UMN 
Characters.—Carapace about twice as wide as long, with lateral expansions 
rarely advanced even as far as half the length of the rostrum, orbital sinus never 
very deep, never as deep as half the length of the rostrum. Rostrum narrowing 
distally, end rounded, no distinct anterolateral angle. Hands tuberculated, with 
several tuberculous ridges on the outer surface. Abdomen crossed by transverse 
ridges, lateral plates with more or less raised margins. 
Dimensions.—Type: length 33.9 mm., width 48.7 mm. 
Color.—Blackish brown on dorsal side, light gray on ventral (Way). Several 
specimens preserved in the U. S. National Museum, greenish in alcohol. 
Type Locality.—Northern California. 
Distribution —Unalaska, Alaska, to Monterey, California, to a depth of 7 
fathoms. 
