1921] Schnutt: The Marine Decapod Crustacea of California 73 
Characters.—Carapace carinated in its anterior half, posterior spine at the 
anterior fifth; upper line of carapace and mid-rib of rostrum nearly horizontal; 
rostrum about three-fourths or five-sixths as long as the carapace, upper and 
lower limbs with convex margins and widest at about the middle of their length; 
armed above with ten to fourteen teeth, the last two or three of which are on the 
carapace; armed below with one to-three spines; tip acute. Eyes large, pyriform; 
cornea extending on inner side almost to the base of the peduncle. Blade of 
antennal scale exceeding the spine considerably, most advanced toward its inner 
margin. 
Dimensions.—Type, female: length 62.6 mm.; length of carapace and rostrum 
24 mm.; of rostrum 11 mm. 
Type Locality.—Off Tawhit Head, Washington, 178 fathoms (‘‘ Albatross’’ 
station 3076). 
Distribution.—From the north coast of Unalaska eastward and southward 
to Point Sur, California, 178 to 636 fathoms (Rathbun). 
Remarks.—The males exhibit the usual differences from the females (described 
above) in being more slender, in the longer antennular flagella, and in the 
abdominal appendages (Rathbun). 
Family CRANGONIDAE (ALPHEIDAE) 
Rostrum very small or wanting. Eyes covered by the carapace. Mandibles 
with incisor process and palp of two segments. First pair legs chelate, with one 
or both chelae powerfully developed. Second pair of legs minutely chelate, long, 
slender, and equal, with segmented carpus. Telson broad and rounded. 
As the genera of Weber (Nomenclator entomologicus, 1795) complying with 
the International Code of Zoological Nomenclature are to be accepted as valid 
(vide Smithsonian Publ. 1938, 1910) I have followed Miss Rathbun’s findings 
(Proe. Biol. Soc., Washington, 17, 170, 1904b) and have given Crangon precedence 
over Alpheus Fabricius. Hence the name of the family to which this genus belongs 
becomes Crangonidae and the family formerly bearing that name must needs be 
changed. For it Miss Rathbun (op. cit.) has supplied Cragonidae (p. 81), based 
on the genus Crago, in place of the former genus Crangon. 
Key TO THE CALIFORNIA GENERA OF THE CRANGONIDAE 
I. Rostrum present, short and pointed; hands normal, dactyl of larger hand 
opening either vertically or horizontally; front either unispinose or tri- 
spinose. 
A. No pterygostomian spine. Thoracic feet with epipods; dactyli sim- 
ple. (Not known north of the Farallon Islands.) 
Crangon, p. 74. 
B. Pterygostomian spine present. Thoracic feet without epipods; dac- 
tyli bifid. (Not known north of Santa Monica Bay and Santa 
Catalina Island.) 
Synalpheus, p. 77. 
II. Rostrum wanting; hands inverted so that dactyls are on lower side; front not 
spined, either emarginate between the eyes or evenly rounded. (Not known 
north of Point Arena.) 
Betaeus, p. 79. 
