788 CALIFORNIA ACADEMY OF SCIENCES. 
Sound in 1880. The extensive collections made by the 
Albatross in the north have been mostly from much greater 
depths. 
The plates of the present paper are all drawn by Miss 
Anna L. Brown, artist of the Hopkins Seaside Labora- 
tory. 
: Family PETROMYZONIDE. 
1. Entosphenus tridentatus (Gairdner). 
Common; ascending the fresh waters in spring to 
spawn, reaching a length of over 2 feet. It is not used 
as food. Not taken by us. 
2. Lampetra cibaria (Girard). 
Not rare; ascending streams, reaching a length of 8 
inches; not used as food. Not taken by us. 
Family HEXANCHIDE. 
3. Notorhynchus maculatus Ayres. 
Recorded (as LVotorhynchus borealis) from Nisqually, 
Washington, by Dr. Gill. Not taken by us. 
4. Hexanchus corinus Jordan & Gilbert. 
Originally described from Neah Bay and from the Bay 
of Monterey. Not seen by us. 
Family GALEIDE. 
5. Prionace glauca (Linneus). BLUE SHARK. 
Recorded by Jordan & Gilbert; rare. Not seen by 
us. 
Family DALATIID.-E. 
6. Somniosus microcephalus (Bloch). GROUND SHARK. 
Not uncommon. A very sluggish shark. Recorded 
by Jordan & Gilbert from Victoria. A stuffed specimen 
from Seattle in the Museum of the Young Naturalists’ 
Society. 
