118 University of California Publications in Zoology [Vol. 23 



Dimensions. — Length of a male specimen 39 mm., length of large eheliped 

 39 mm., of small eheliped 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. 



Bemarks. — This species and C. calif or niensis 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 calif orniensis. 



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, p. 167). 



Within the bay CalUanassa 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, pis. 5, 6) our limited 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, pi. 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 



