1921] Schmitt: The Marine Decapod Crustacea of California 121 
pace 17 mm., of large cheliped 50. mm., of hand and fingers 16 mm., of carpus 
8.5 mm., greatest width of hand 8 mm., and of carpus 9.5 mm. 
Type Locality.—Point Loma, California. 
Distribution.—From Santa Monica Bay to San Diego, California (Rathbun). 
Callianassa goniophthalma Rathbun 
Callianassa goniophthalma Rathbun, Proe. U. 8S. Nat. Mus., 24, 886, 1902; 
He AS HE, 10; 154, pl 8, 1904. 
Characters.—Front with a sharp and prominent median tooth which reaches 
barely one-third the length of the eye-stalks. Eye-stalks reaching nearly to end 
of first antennular segment, oblong, more than twice as long as wide; sides sub- 
parallel; antero-internal angle produced in a tuberculiform tooth, these teeth being 
slightly divergent from each other; eyes without pigment. Large cheliped of 
male with carpus much shorter than wide, nearly twice as deep as long, and one- 
half as long as palm. 
Dimensions.—Type, male: length of carapace 30.5 mm., of abdomen 67.5 mm.; 
of female: length of carapace 22.2 mm., of abdomen 52 mm. 
Type Locality—Off Point Conception, California, 278 fathoms (‘‘ Albatross’’ 
Station 3198). 
Distribution —Also taken by the ‘‘Albatross’’ in Clarence Strait, Alaska, 322 
fathoms, and off Harris Point, San Miguel Island, California, 264 to 271 fathoms. 
Family PaGuriDAE 
The ‘‘hermit crabs.’’ Abdomen soft, showing no trace of segmentation, 
straight, twisted, or spirally coiled; some of the appendages lost, the remainder 
much reduced; tail-fan not adapted for swimming, adapted for holding body into 
hollow objects. Carapace firm in fore part and soft in hinder part. First pair 
of legs chelate; fourth pair unlike the third. 
The Paguridae fall naturally into two groups (Bouvier, 1896), p. 126; Alcock, 
1905, p. 21) and for convenience are here so arranged. 
I. External maxillipeds approximated at the base. Chelipeds equal or subequal, 
or left larger than right, p. 122. 
II. External maxillipeds widely separated at the base. Right cheliped larger than 
the left, p. 128. 
In the keys and diagnoses below reference is made to abdominal segments; 
although the abdomen is typically soft and unsegmented the somites can, as a 
rule, be approximately determined by the number and arrangement of the abdom- 
inal appendages when these are present. The abdomen is spirally coiled in all 
the representatives of the genera here listed except Pylopagurus minimus and 
P. holmesi, in which it is quite straight. 
Key TO THE CALIFORNIA GENERA OF THE PAGURIDAE 
7 
J. External maxillipeds approximated at base. Chelipeds equal or subequal, or 
left larger than the right. 
A. Paired appendages present on the first two abdominal segments of male 
and first abdominal segment of female. Chelipeds equal or sub- 
equal. Fourth pair of legs not chelate. 
= 2 a Paguristes, p. 122. 
