118 University of California Publications in Zoology  [Vou. 23 
Dimensions.—Length of a male specimen 39 mm., length of large cheliped 
39 mm., of small cheliped 22.5 mm. (Holmes). Often grows to be 101.6 mm. 
in length (Stimpson). The specimens taken in the course of the Bay Survey 
ranged from 15 to 97 mm. in length, mostly 48 mm. and over. 
Type Locality—Puget Sound. 
Distribution—From Vancouver Island, British Columbia to San Quentin Bay, 
Lower California. 
Remarks.—This species and C. californiensis are very similar in practically 
all other characters except the large chelipeds of the adult males. The females 
apparently can only be distinguished by the differences in the rostrum and the 
relative stoutness of the smaller chelipeds, which though very similar also seem 
to have proportionately a somewhat narrower hand and carpus in longimana 
than in californiensis. 
Biological Survey of San Francisco Bay.—The Callianassas are 
soft bodied crustaceans which ‘‘ generally burrow in sand or mud either 
in the littoral zone or in deeper waters; at the same time they can 
swim with considerable activity by means of the pleopods’’ (Smith, 
1909 p16): 
Within the bay Callianassa longimana runs very true to type, 
having been dredged only at stations having a sandy or a purely 
mud bottom; two specimens were captured by means of the tow-net 
(H 4996, 5124). The dredging stations ranged from Pinole Point 
in the upper bay down through the eastern or muddy portion of the 
middle bay, to Point San Bruno in the lower bay. All told, this 
species was taken at seventeen dredging stations, distributed as fol- 
lows: upper bay three, D 5716, 5717, 5820; middle bay nine, D 5708, 
5709, 5714, 5740, 5756, 5822-5825; lower bay five, D 5724, 5727, 5730, 
5766, 5835. The two hydrographic stations were made at approxi- 
mately the same position (Primary hydrographic station 4971, just 
north of the head of Raccoon Strait (see plate 8). 
In view of the great extent of the mud and sandy mud area in 
the bay (see Sumner, 1914, pls. 5, 6) our Lmited number of records, 
which represent only 11% of the total number of dredging stations, 
must be explained on the ground of the burrowing habits of this 
crustacean rather than the scarcity of specimens. It is interesting to 
note, in this connection, that the greater number of specimens per haul 
were obtained with the ‘‘orange-peel bucket’’ dredge (Sumner, 1914, 
p. 7, pl. 10). From the six stations at which it was employed an aver- 
age of eight specimens per haul was returned as compared with one 
and six-tenths specimens per haul at the eleven at which the ordinary 
types of dredge or trawl were used. The relative efficiency of the 
two kinds of apparatus probably accounts for the absence of material 
from localities in the bay where it can reasonably be expected and 
