REPORT OF THE DIRECTOR 1920-21 1 67 



In addition to the places listed above, Macoma groen- 

 1 a n d i c a has been found at Norwood, in the vicinity of Chazy, 

 and at Essex and southward. 



In Vermont the greatest number of species have been reported 

 from the vicinity of Burlington, probably because that area has 

 been better searched. The writer has found in the clays about 

 a mile north of Burlington aBalanus crenatus, not hitherto 

 reported from that state, and in the clays just north of Chimney 

 Point Yoldia arctica, not before reported so far south as 

 this. The fossils in Vermont have been found from north to south 

 as follows: 



1 McBride Bay, South Hero 2 Burlington and vicinity 



Mya arenaria Macoma groenlandica 



Macoma groenlandica Saxicava rugosa 



Saxicava rugosa Yoldia arctica 



Balanus crenatus (rare) 



3 Mallett's Bay, north of Burlington 



Ophioglypha sarsii Yoldia arctica 



Lepralia sp. Yoldia obesa 



Macoma groenlandica Leda minuta 



M. calcarea Nucula tenuis 



Saxicava rugosa N. expansa 



Mya arenaria N. abyssicola 



Mytilus edulis Cryptodon gouldii 



4 Colchester 5 Chimney Point 



Macoma groenlandica Macoma groenlandica 



Saxicava rugosa Yoldia arctica (rare) 



Mya arenaria 

 Yoldia obesa 

 Yoldia siliqua 

 Tethea sp. 



In addition, Mytilus edulis has been reported from Isle 

 La Motte, Mya arenaria from Providence island, and 

 Yoldia obesa from St Albans. Shells also have been noted 

 at Swanton, Milton Falls, Milton, West Milton, Chickering Village, 

 Shelburne Falls, Charlotte, Vergennes and Addison, but no lists 

 of species have been given. 



The above tables and lists bring out the fact that the number of 

 Pleistocene species is considerably reduced at Ottawa and vicinity, 

 while from Pakenham Mills about 30 miles southwest of Ottawa, 

 not far from the most western limit for marine fossils, is reported 

 only Macoma groenlandica. In the Champlain valley 

 the number of species decreases rapidly until at Willsboro, N. Y., 

 only five species are represented. 



