THE NAUTILUS. 69 



in shells had I not studied the animals in them and learned of their 

 friends and their enemies, their food and manner of reproduction. 

 I have also learned that when we find certain species we may expect 

 to find there certain other species, either because both like the same 

 conditions of life, or one may prey upon another. 



Lepeta concentrica was one of my new finds in April. It was 

 dredged from 100 feet of water and was clinging to stones, to which 

 Waldheimia pulvinata and the eggs and young of Placunanomia 

 macrosclnsma were also attached. Placunanomia macroschisma 

 grows to a large size here, four inches across, and of a lovely green 

 tint inside. The animal is a bright orange in color, and is good 

 eating. 



During March and April we collected several thousand of the 

 finest Purpura crispata I have ever seen pure white, orange, brown, 

 striped and banded, smooth and foliated, huge and infantile, one can 

 hardly tell how variously beautiful they are. I have given two entire 

 drawers in my cabinet to them. I have one in color exactly like a 

 violet snail. 



During May we found several live Acmcea mitra, whose " white 

 caps " had a most decided green color. They are larger than the 

 southern ones. I got five shells, which were new to me, from 

 Lemon's Beach, on the Narrows Eulima rutila, a shell of rare 

 beauty both in form and color, being pure white at the apex and 

 bright rosy pink at the base; Eulima fa/cata, pure white and larger 

 than E. rutila; Axinea intermedia, larger than described in west 

 coast shells; one Lucina, unknown at Washington, and some fine 

 Semele rubroradiatu which live in the little sandy pit-holes of a hard 

 cement reef which is bare at low tide. Here, too, we found many 

 live Psitmmobia rubroradiata . Both kinds of these red-rayed clams, 

 especially the latter, told us where they lived by spouting up small 

 streams of water at intervals. 



In company with a friend I went to Fort Defiance where we found 

 Acmcea digitalis living in the crack of a granite rock. We found 

 Oryptoehiton stelleri and an unknown Chiton, whose shell is salmon- 

 colored on the inside. Cryptochiton is very abundant here at 

 certain times, when they come ashore to breed. We have collected 

 several hundred of them at a place, and a month later not one was 

 to be seen. Our largest was thirteen inches long. Most of them 

 are brown, but some are almost white. We found them on rocks 

 and flat on the pebbly beach at extreme low tide. We found them 



