28 THE NAUTILUS. 



tically no marine species at this end of the island as the shore line 

 drops into deep water. After several days' search I was well repaid 

 by finding some fine live specimens of the beautiful Helix veatchii 

 (Nevvc.) Try on. This species varies much from almost white to 

 dark many-banded specimens. At first I found a few fairly good 

 dead shells, but search as I might under stones, through cactus, and 

 chaparral not a live one could I find, until by chance I spied one 

 roosting on a limb of the dwarf oak peculiar to this island. This 

 species seems to be entirely a tree snail. 



At the south end of the island a Helix identified by Dr. Pilsbry 

 with H. canescens Ads. and Rve. occurs in colonies in exposed places 

 on rocks. H. veatchii is scattered over a larger area on the island, 

 the many color varieties being found sometimes on the same tree. 



At South Bay Cedros Island we collected under stones at low 

 water the following : 



Semele rupium Sby. Callistochiton decoratus. 



Vermetus fewkesii Yates. Chaetopleura gemmea Cpr. 



Scurria mesoleuca Mke. Cyanoplax hartwegii. 



Latirus lugubris C. B. Ads. Nuttallina scabra. 



Drillia moesta Cpr. Murex incisa. 



Trivia solandri. Murex nuttalli Conr. 



Area reeviana d Orb. Lucapina crenulata. 



Area gradata B. & S. Macron lividus A. Ads. 



O 



Columbella fasciata Sby. Amphissa versicolor Dall. 



Mopalia muscosa Gld. Tegula aureotinctum Fbs. 



Ishnochiton conspicuus Cpr. Tegula gallina Fbs. 



Ishnochiton acrior Cpr. Fissurella volcano Rve. 



Ishnochiton didymus B. Fissurella volcano var. crucifera 



Ishnochiton clatheratus Cpr. Dall. 



Callistochiton crassicostatus Cpr. Megatebennus bimaculatus. 



Cedros Island seems to be the northern limit of the large red crab 

 Grapsus grapsus. They are very hard to catch for the moment 

 they see one approaching, they clatter off' pell-mell over the rocks as 

 fast as their ten legs will carry them and jump into deep water 

 where they swim like a fish. 



On a pebble beach midway the east coast of Cedros I found the 

 following beach-worn shells cast up by some storm; the list is inter- 

 esting in that it shows the intermingling of northern and southern 

 species at this point. 



