THE NAUTILUS. 45 



Acmaea incessa Hinds. On seaweed at low tide. 



Acmaea instabilis Gould. With the preceding. 



Acmaea triangularis Carpenter. 12 fathoms. Not rare among 

 red sponge on the hard clay and always accompanied by the follow- 

 ing species. 



Acmaea rosacea Carpenter. 12 fathoms; all quite small speci- 

 mens. Also on shore. 



Acmaea mitra Eschscholtz. Between tides, but usually far out on 

 exposed rocks. Shells always encrusted with a growth of " coral- 

 line," etc. 



Acmaea patina Eschscholtz. Between tides ; plentiful. 



Acmaea patina, var. scutum. Between tides. 



Acmaea patina, var. fenestrata Nuttall. Between tides ; rather 

 rare. 



Acmaea scabra Reeve. Between tides ; abundant. 



Acmaea pelta Eschscholtz. Between tides; common. 



Acmaea pelta, var. nacelloides Dall. Between tides ; not rare. 



A cmaea persona Eschscholtz. Between tides ; common. 



Acmaea spectrum Nuttall. Between tides ; common. 



Acmaea (Lottia) gigantea Gray. Between tides; abundant. 



Phasianella compta Gould. Shore line to 12 fathoms. 



Phasianella {compta, var.) pulloides Carpenter. With the pre- 

 ceding. 



Eucosmia variegata Carpenter. Between tides ; uncommon. 



Eulithidium substriatum Carpenter. A few specimens dredged at 

 12 fathoms depth. 



Pachypoma inequale Martyn. One of the finest species in the 

 region. It occurs all the way from low water mark at least down to 

 a depth of fifteen fathoms and is by no means rare. A few speci- 

 mens obtained are extraordinarily large and heavy. 



Leptothyra bacula Carpenter. Between tides ; common. 



Leptothyra paxicicostata Dall. Between tides ; one poor specimen. 



Leptothyra carpenteri Pilsbry. Between tides ; common. Also 

 to 20 fathoms depth. 



Norrissia norrissii Sowerby. 12 fathoms; one very yonng speci- 

 men. 



Calliostoma anmdatam Martyn. 12 fathoms; not rare. Several 

 beautiful examples of this exquisite species. 



Calliostoma canaliculatum Martyn. 1 2 fathoms, and a Dumber of 



