48 E. Billings on the Genus Athyris. 
i variations as to the number of the digits themselves, 
ifference of quantity and therefore teleological in its character. 
D. Finally, even if there were not many vertebrates in whic 
this difference does not exist, and if there were not on record 
several cases of human thumbs having three phalanges, ye 
unless we are prepared to sacrifice position to quantity, we hav: 
no more reason for denying the homology of the thumb and 
great toe with the little toe and little finger respectively than we 
Art. VI.—On the Classification of the subdivisions of McCoy's 
nus Athyris, as determined by the laws of Zoological Nomenclature 
by = BiLuines, Paleontologist of the Geological Survey 
an 
[Read before the Nat. Hist. sor Montreal, March 25, 1867. 6 
gard to the classification of the several sections 
old genus Athyris has been divided, The ro en hi 
e w 
po a pinta ith ah shells of na genus in gems Principal Dawson deplored 4 the 
confusion that has arisen through conflicting views on the ation of nomenclature; 
and agreeing with Mr. Billings in the conclusion he had come to, said that this 
been rendered obscure varie claus up a question that had hitherto 
_ + Modified by oe Merista thus : 
: ‘ Typz. 
Athyris McCoy, 1644 + + + ‘+ = A, tumida Dalman. 
va D’Orbigny, 1847,- - - - § ri Buch. 
erista Bae, HO61, - - M. Herculea Barrande. 
Meristella Hai eS oe ie tld 
Fr ee Kpivigneny RL Sree + 8S. concentrica. 
= - M. Herculea, 
= 5 saieontng: th Sohenadibia Paige Sipiriger’ tien’ suppressed, order to 
tia rooms for Moriatlla SSP nl 
