386 THE CANADIAN NATURALIST. [Dec. 



in the neighbouring waters. The resemblance between the fossil 

 glacial Ostracoda of America and the Ostracoda of Scotch glacial 

 clays, being closer than the resemblance between the glacial and 

 the living Ostracoda of Scotland, renders the determination of their 

 relationship to living American Ostracoda of considerable 

 geological importance. It may be useful to geologists to enumerate 

 the Ostracoda found in the various clays we have examined, and 

 indicate at the same time the general character of the groups of 

 Mollusca with which they are associated. 



Portland. — Out of 31 species of Mollusca catalogued, 18 

 occur fossil in Scotch glacial clays, includiog such characteristic 

 forms as Pecteii Groenlandicus ; Fecten Islandicus ; Ledapygmoea ; 

 Tellina calcarea (proximo) ; Natica affinis (dausd) ; Buccinum 

 Groelandicum. The associated Ostracoda are : 



Cytbere emarginata (Sars). Cytherura Sarsii (Brady). 



" coDcinna (Jones;. ' " cristata, nov. sp. 



" Dawsoni (Brady). " striata (Sars). 



" limicola (ISTorman). " granulosa, nov. sp. 



" dunelmensis (ISTorman J. " undata, var. 



Cy theridea papillosa ( Bosquet). Cytheropteron latissimum ( j^orman) 



" Sorbyana (Jones). " nodosum (Brady). 



Loxoconcba granulata (Sars) Sclerocbilus contortus (i!^ormau). 



Xestoleberis depressa (Sars). Paradoxostoma variabile (Baird). 

 Cytberura nigresceus (Baird). 



Saco (^Maine). — On the banks of the Saco river, about ten 

 miles from its mouth, 15 species of Mollusca are catalogued, of 

 which only five occur in the Scotch clays, viz. : Leda pygma^a ; 

 Leda arctica ; Nucula inflata ; Menestho alhida ; Katiea affinis 

 — M. ulhida, however, being rather doubtful and very young^ 

 The great abundance of Leda arctica constitutes a remarkable 

 analogy between this bed and the clay at Errol near Dundee, 

 and at Moss in Christianiafjord. The associated Ostracoda 

 are : 



Cytbere leioderma riSrorman). Cytberide^ papillosa (Bosquet). 



" lutea (Miiller). " cornea (Brady aud Robertson). 



" MacCbesneyi, nov. sp. " Sorbyana (Jones). 



" emarginata (Sars). " "Willianisoniana'? (Bosquet). 



" limicola (ISTorman). Cytheropteron latissimum iSTorman. 



" cuspidata, nov. sp. " complanatum, nov. sp. 



" dunelmensis (iJ^ormau). 



Lcwiston, 110 feet above the sea. Only two species of Mollusca 

 can wc find yet determined from near this place, viz. : 3fya arenaria 



