104 University of California Publications in Zoology (VoL. 23 
immature specimen, from a depth of 38 to 45 fathoms, off Santa Rosa Island 
(‘‘ Albatross’’ station 4431), and one, a male from 46 to 56 fathoms, in Monterey 
Bay (‘‘Albatross’’ station 4551). Still another California specimen is contained 
in the collection of the Scripps Institution; it was taken July 11, 1905, in 110 
fathoms, off La Jolla (haul 998). 
Suborder REPTANTIA 
Kery TO THE TRIBES OF THE REPTANTIA 
I. Third pair of legs like the first. Abdomen macrurous, straight, symmetrical, 
well armored, with good pleura and strong tail-fan, lobes of first seg- 
ment clipping the carapace. 
A. Rostrum small or wanting, third pair of legs simple and subcylindrical, 
carapace fused at sides to the epistome. Exopodites of last pair 
of abdominal appendages without sharp suture. (Not known north 
of San Luis Obispo.) 
Palinura, p. 105. 
B. Rostrum of good size; third legs chelate. Carapace free from the 
epistome. Exopodites of last pair of abdominal appendages divided 
by a suture. (Except for the crayfishes, fresh-water forms, not dealt 
with in this paper, not found in California waters. ) 
Astacura. 
Il. Third pair of legs unlike the first, abdomen rarely macrurous. 
A. Abdomen fairly large, anomurous; reduced in some of its features, 
but showing clear traces of some function other than that of repro- 
duction, and almost always carrying biramous limbs on the sixth 
segment. Tail-fan usually present, uropods biramous, absent only 
in the Lithodidae. Carapace not fused with epistome. Antennae 
situated external to the eye, with long flagellum, often with mov- 
able antennal scale. Last thoracic sternum free, its legs always 
differing clearly from the third pair in size and position and nearly 
always in size and shape. 
Anomura, p. 109. 
B. Abdomen comparatively small, brachyurous; small, straight, symmetri- 
cal, bent under the thorax, showing no traces of other function than 
reproduction, and without biramous limbs on the sixth segment. 
Tail-fan not developed, uropods rarely present, never biramous, only 
in the Dromiidae are they present and then only in a rudimentary 
condition. Carapace fused with epistome at sides and nearly always 
in the middle. Antennae situated internal to the eye, seldom with 
long flagella, and never with a movable scale. Last thoracic sternum 
fused with the rest, its legs often like the others. 
Brachyura, p. 182. 
