No. 2.] WHITEAVES — NEW DEVONIAN FOSSILS. 101 



This species was found in great abundance both by Mr. Foord 

 and Principal Dawson, the most perfect specimens beinti; those 

 which were obtained from weathered surfaces. The resemblance 

 of this little shell to the Cydora minufa of Hall, from the Hud- 

 son River Group of Cincinnati, is certainly very close. The only 

 differences that can be noticed between them at present, judging 

 by Meek's detailed descriptions of Hall's species, are that the 

 aperture of C. valvatifonnis is slightly subangular behind and 

 the lip somewhat expanded, whereas the phrases used to describe 

 the corresponding parts of the shell of C. mimita are simply — 

 "aperture circular, lip thin." It is scarcely likely, however, 

 that a shell which occurs associated with remains of Coccostens 

 and Ce2:>halaspis^ on the same small hand specimens of rock, is 

 identical with a species from such a different geological horizon 

 as the Hudson River Group. 



Cyclora turhinata. Sp. Nov. 



Shell very small, turbinate or turbinate conical, about one- 

 third higher than broad, spire elevated: whorls four or four and 

 a half, ventricose, rounded, increasing rather slowly in size, 

 sutures rather deep : body whorl also rounded, base imperforate, 

 aperture sub-circular, slightly angular behind : lijD thin and 

 somewhat spreading. 



Length three lines, maximum breadth two lines. 



Not more than about half a dozen specimens of this little 

 shell have been collected. The species is invariably found asso- 

 ciated with the C. valvatifonnis^ from which it differs in its 

 much more elevated spire and closed umbilicus. Like C. vaha- 

 ti/ormis, the present species is 6on)ewhat similar to one of the 

 diminutive gasteropoda of the Hudson River Group of Ohio, the 

 Cyclora parvida. of Hall, but the body whorl of the latter shell is 

 described as subangular, and its umbilicus as not quite closed. 



