300 FKOCEEDINGS OF THE ACADEMY OF [1889. 



Since, then, it is manifest that Polyphemopsis is not correctly 

 applicable to any known American gasteropods, and inasmuch as 

 Bulimella of Hall was preoccupied by Pfeiffer, it is necessary to find 

 some more appropriate term to designate this group. Bulimorpha, 

 established by Whitfield, is apparently the only available name 

 for the shells in question, but whether this title will eventually be 

 considered valid cannot now be fully decided. 



In connection with Polyphemopsis Conrad's genus Subulites has 

 frequently been alluded to, and by Lindstrom 2 and others the two 

 terms have been considered nearly or quite synonymous. The 

 validity of the latter group is however questionable. The type was 

 very imperfect, consisting only of a portion of the body whorl and 

 three or four of the preceding volutions — the upper portions ot the 

 spire and the apertural parts being entirely unknown. Strangely 

 enough, of more than a dozen species described under the genus there 

 is not a single one but that is fragmentary, or in the condition of 

 broken casts, indicating only the general shape of the shell. 



The following American forms have been referred to Polyphemopsis. 

 The group doubtless includes also several other Carbonic species de- 

 scribed under Loxonema and allied genera. 



Bulimorpha bulimiformis (Hall). 



Bulimella bulimiformis Hall, 1858. Trans. Albany Ins., vol. IV, 

 p. 29; Polyphemopsis bulimiformis Meek and Worthen, 1866, Geol. 

 Sur. Illinois, vol. II, p. 373; Bulimorpha bulimiformis Whitfield, 

 1882. Bui. Am. Mus. Nat. Hist,, vol. I, p. 74. Warsaw Limestone. 



Bulimorpha canaliculata (Hall). 



Bulimella canaliculata Hall, 1858. Trans. Albany Inst., vol. IV, 

 p. 29 ; Polyphemopsis canaliculata Meek and Worthen, 1866. Geol. 

 Sur. Illinois, vol II, p. 373; Bulimorpha canaliculata Whitfield, 

 1 882. Bui. Am. Mus. Nat. Hist,, vol. I, p. 74. Warsaw Limestone. 



Bulimorpha chrysalis (Meek ami Worthen). 



Polyphemopsis chrysalis Meek and Worthen, 1866. Proc. Acad. 

 Nat. Sci. Phila., p. 267 ; P. chrysalis M. and W., 1873. Geol. Sur. 

 Illinois, vol. V, p. 596. Lower Coal Measures. 



In the absence of specimens for examination the exact generic 

 relations of this form cannot with certainty be determined; but it 

 appears to have closer affinities to this than to any other group. It 

 resembles somewhat young shells of Soleniscus {Macrochilus) new- 



1 Bui. Am. Mus. Nat. Hist., vol. I, p. 74. 1882. 

 -Index to Generic Names of Gasteropoda Pake. Period. 



