60 THE NAUTILUS. 



Going to Cable Lake, West Orange, I collected Planorbis 

 antrosus. The lake is a small one situated on the top of a 

 mountain, the shore of which is partly sand and stones. Here 

 is the home of the Planorbes, which are covered with algae. 



The Rahway River, in Union Co., was next visited in search 

 of Unios. Two specimens of Anodonta cataracta in perfect con- 

 dition were secured, but further search failed to produce more 

 of that species; but about fifty Unio complanatus were obtained. 

 I also collected Physa heterostropha along the bank in company 

 with Lymnea palustris, and in the shallows Campeloma rufum 

 was found in company with a small variety of Planorbis trivolvis 

 and Sphaerium sp. 



The last three trips to Bloomfield proved the best. The col- 

 lecting was done in Great Notch Brook which flows through 

 part of the town where it comes from Brookdale. Starting at 

 the end of the trolley line and working up stream I found small 

 dead Planorbis trivolvis that had been washed in hollows and 

 crevices among the stones. Live ones were gathered farther up 

 stream and also Unio complanatus, which I will compare with 

 the Rahway River shells later. 



Going still further up stream, I found the first specimens of 

 Goniobasis virginica in the shallow water near the bank; also 

 broken Campeloma decisum, later two perfect specimens were 

 found. The Goniobasis were large specimens ranging up to an 

 inch in length, many of them so eroded as to be hardly recog- 

 nizable except by the animal itself. Still further up the Gonio- 

 basis became more plentiful and also Lymnaea palmtris, both 

 alive and dead in the drift, which was composed of the dead of 

 both and a few valves of Unios. 



The Lymnaeas were found on the stems of water plants and 

 also floating on the surface, foot up; the Goniobasis were cling- 

 ing to the stones and crawling on the bottom. Both the smooth 

 and ribbed variety (multilineata) were found, both banded and 

 plain. More Unios were found, so I returned home satisfied 

 with the afternoon work. 



On the last trip I found but few specimens of Goniobasis. A 

 heavy rain a few days before had made the stream moderately 

 high, and the few specimens that I obtained were buried ver- 



