292 University of California Publications in Zoology  [VoU. 23 
forty-three (23%) to the region south of it, while one hundred and 
ten (61%) range both north and south. 
Biological Survey of San Francisco Bay.—Geographically the 
species taken in connection with the survey (bold face type in the 
preceding lists) fit very well into the scheme outlined above. This also 
holds true if the species reported from the region covered by the 
survey (the bay and that portion of the Gulf of the Farallones lying 
south of the Farallon Islands) but not taken in course of it (marked 
with an * in the preceding lists) are included, as shown in the follow- 
ing summary : 
SUMMARY OF GEOGRAPHICAL DISTRIBUTION OF THE BIOLOGICAL SURVEY SPECIES5 
Plus those 
reported from 
Only, = 46 region but not 
taken during 
Species peculiar to San Francisco Bay (Pinnixa Survey, = 70 
HT CLTUCUSC OTL) arene eee eee eee 1 ( 2%) i ( £%') 
Species which on west coast of North America are 
confined), to) Califformiay waters) ==. se senna n= 4 ( 9%) 6 ( 8%) 
Species ranging north of survey region ........--.---.----- 40 (87%) 57 (81%) 
Species ranging south of survey region -............------ 42 (91%) 65 (93%) 
Species ranging both north and south -..................- 37 (80%) 53 (76%) 
Species finding the northern limit of their range 
bay ques) DEYN AE ISCO) saececceree ster tes eree pete reo teorceaceaCEEC 3 ( 6%) 5 ( 7%) 
Species finding the northern limit of their range 
in the Aleutian-S.E. Alaska stretch -...........-..-...- 19 (41%) 28 (40%) 
Species finding the northern limit of their range 
in the British Columbia-Oregon stretch -.......-.---- 15 (33%) 19 (27%) 
Species finding the southern limit of their range 
in the Coronados-Magdalena Bay stretch -....... 15 (33%) 22 (31%) 
Species finding the southern limit of their range 
in the Gulf of California or beyond -.........---------- 5 (11%) 8 (11%) 
Species occurring only in the stretch between the 
Aleutian Islands and Magdalena Bay ..........-.-- 388 (83%) 57 (81%) 
Species also reported from the western North 
IBEvonae, Clniesihys stdoyny ENO pa ee see eee cree cece 8 (17%) 9 (13%) 
Species also reported from the Atlantic littoral 
(OCrONGON GENTPES) ee nncnsenenenswnennsneneaeeeweenennnnennene 1 ( 1%) 
Species having a bathymetric range exceeding 
AOL lie iis] so) 1 fee RR er ne ns OP hr pe 2 ( 3%) 
Ecologically only the species taken in the course of the survey 
operations will be considered, and then only in a very general way. 
Future collecting will unquestionably considerably alter the local dis- 
tribution patterns, as at present known, for a number of the species; 
for aside from the fact that only forty-six’ (66%) of the total seventy 
5 Through an unfortunate oversight Cancer gibbosulus was omitted from this 
discussion. Of this species three specimens were taken, outside, at station D 5790, 
33 to 35 fathoms, bottom ‘‘very coarse variegated sand, with a small proportion 
of fine sand.’’ 
