2.38 THK ICK A(iK IN CANADA. 



Cnjiitodon (loulili'i. I'liilippi. 



Fossil — Montreal. Rare. Matthew records a species supiKJsed to 

 be distinct from C. (lonlilii at St. John. 



Recent — Murray Hay; ( Jaspe (Whiteaves) ; Little Metis ; Kainour- 

 aska ; (irccnl.-uid to N'ew Hngland. 



Tiie Knroi)can form (\ jh .viiosii {Axiiiiisjii xiiotitii) is usually reganled 

 as distinct, and is found as far north as Spit/.hergen, and in the Crag, 

 tiie Clyde beds, and the Xijrway I'ost-jjliocene, and in British Cohunbia. 

 Jeffreys, however, considers the ditFcrence merely vai'ietal, and it 

 certainly seems to diminish or disappear in the northern and glacial 

 specimens. 



According to Mr. Whitcaves this species has a great range in depth 

 in the gulf of St. Lawrence, being found, living, from 20 to , SOU fathoms. 



Sphderiiim ! 



Fossil — I'akenham Mills, witli fresh-water l)ivalves and TtUiiKi 

 ilru-iilfuidtai. The specimens were too imperfect for certain deter- 

 mination. 



Unto rectus, Lamarck. 



Fossil — Clarenceville, Lake Champlain (Dickson), with Mya nrtii- 

 (O'id, Ti'U'ina (irnii/niiillrd, itc. 

 Recent — Kiver St. Lawrence. 



Unio Cdnlhnii f Ralincsijue. 



Fossil — With the preceding. This and the preceding species were 

 represented by large and tiuck shells better developed than thcjse of 

 the River St. Lawrence at present. It is probal)ly the same with 

 U. vtnli'koKHn, llarnes. 



Uii'io (l/i/isifi. Say. 



Fossil — 'i'oronto ; Interglacial lleds. 

 Recent — River St. Lawrence. 



MijtUiiii ediilis. Linn. 



Fossil — ^^ontreal ; Acton ; Rivicre-du-Loup ; Quebec ; Chaudiere 

 Station ; Anticosti ; Labrador (Packard) ; Lawlor's lake, N.B. 

 (Matthew); (Jrcenland (MiUler). 



Recent— North Atlantic and Arctic seas generally ; British Columbia 

 and North I'acitic (= /ro.s.s»/((s, Gould) ; as far south as Monterey. 



The variety most commonly found in the Pleistocene is a small, 

 oval, tumid form, allied to variety elei/aiix of liritish writers. This 



