PLKISTOCKNE FOSSILS. 241 



Leda tnhnita, Fiil)ricin«. 



FosBJl — Ledft clay, Montreal ; Hivit-Tc-ilu-Loup ; St. John, &i\ 

 (Matthew) ; <lreenlaii(l (Miillor) ; Lahnulor (Packard). 



Recent — Fiittlo Metis ; Kaniouraska ; also liritiHh Columbia ; Arctic 

 seas, <!ulf St. Lawronce ; coast of Nova Scotia. 



Tiio fossil speciinciLS occur ahundautly with the last spccica at 

 Rivirre-tlu-Loup, and are quite similar to those dredged at Murray 

 IJay. This was called L. rtiuihild in my former lists. 



Leda pynmn'ii. Munster. 



Fossil — Leda clay, (Jreen's Creek, Ottawa; Saco, Maine; also 

 English Crag and other (ilacial lieds. 



Recent — North Kuropean seas ; hut nr>t yet recognized on the 

 American coast. According to Mr. JelFreys and Dr. ('arpenter, our 

 drift-shells arc rcfcral)le to the variety or species Yoldia, aliyssifola of 

 Torell. 



Yo/diii {/'ort/iindi(() iiirlicn, (iray. (— Laid <//(ici>di.'<, iiute.) 



Fossil — licda clay and Roidder clay, Montreal ; (Quebec ; Ottawa 

 River; Rivicrc-duLoup ; St. John, N. R. ,&c. ; Portland and Saco, 

 Maine ; also in Pleistocene of Norway (Sars), and of Scotland (Crosskey ). 



Recent — Arctic seas. 



Tiiis shell is most abundant, and generally diffused in the Leda clay ; 

 and the variety ordinarily found at Montreal and Riviire-duLoup is 

 precisely identical with the ordinary Arctic form. A long variety, 

 called L. iultrmadid by Sars, is also found at Montreal, tliough rarely. 

 A short variety, connnon in the Pleistocene at Murray Ray, is 

 similar to the L. ni/iqiKi of Reeve from the Arctic seas ; and young and 

 depauperated varieties rcsendile L. sid<'i/erii. of tiie same author. The 

 abundant material from the Pleistocene shows tiiat these are all 

 varietal forms. (Plate V., Fig. 4.) 



This shell is Yo/iHn itirtiai of Sars, but not of Mdller and Morch. 

 It is )'. fntiicnta of Brown. It is I'ort/foidid <jf(ici(tlis of (Jray, and 

 Ledd /'orthmdlcd of Hitchcock. 



Yoldia hicida, Loven (which is alnuulant living in the deeper parts 

 of the (iulf of St. Lawrence) resembles the young form of this species, 

 but the two are probat)ly (juite distinct. J. F. W. 



Yoldia Umatula, Say. 



Fossil — Leda clay, Riviore-du-Loup. Yoldia mpotitla is I'fecorded 

 by Matthew from Black Point, N.B. ;--_ 



Recent— Little Metis; Onlf St. Lawrence to Long Island. 

 17 



