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 
macroschisma 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 Acmea 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; Hulima falcata, 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 rubroradiata 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 Psammobia 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 
Acmea digitalis living in the crack of a granite rock. We found 
Cryptochiton 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 
