242 



(op. cit., p. 106,) says, " leur nombre plus frequent est de sept a huit," 

 and adds, "nous avons sur les yeux des echantillons a cinq cotes, et 

 plusieurs mme a trois." 



CAMPTONECTES CURVATUS, Geinitz. 

 Plate 32, fig. 4. 



Pecten curvatus, Geinitz. 



Pecten virgatus, d'Orbigny. 



Pecten (Camptonectes) curvatus, Stoliczka. 



=Camptonecte8 cxtenuatus, Meek. 



Hall and Whitfield. 



Whitfield. 



1843. Kieslingsw, p. 16, pi. 3, 

 fig. 13. 



1848. Quadersandstein, p. 180. 



1845. Pale'ontologie Frangaise, 

 Terrains Cre'tace's, VoL 3, p. 

 602, pi. 434, figs. 7-10, as of 

 Nilsson, but not P. virgatus 

 Nilsson. 



1871. Palseontologia Indica, 

 Cephalopoda of S. India, Vol. 

 3, p. 433, pi. 31, figs. 15-16, 

 and pi. 41, figs. 433. 



1865. Palaeontology of the 

 Upper Missouri, p. 78, pi. 3, 

 fig. 6. 



1877. United States Geologi- 

 cal and Geographical Ex- 

 ploration of the Fortieth 

 Parallel, Vol. 4, p. 290, pi. 7, 

 fig. 18. 



1876. Palseontologyofthe 

 Black Hilis of Dakota, p. 

 353, pi. 4, figs. 4, 5. 



East end of Maud Island, a single right valve. Judging by the 

 figures and descriptions only it is very difficult to see how the Camp- 

 tonectes extenuatus of Meek is to be distinguished from the O. curvatus 

 of G-einitz, assuming that Dr. Stoliczka's synonomy of the latter species 

 is correct, which the writer has no reason to doubt. 



AMUSIUM LENTICULAEE. (Nom. Prov.) 

 Plate 32, fig. 5. 



Shell strongly compressed, thin, lenticular ; outline as viewed laterally 

 nearly circular, the length and height being very nearly equal: anterior, 

 posterior and basal margins regularly rounded ; beaks small, prominent, 

 erect, appressed and central ; superior border, exclusive of the ears, 

 descending obliquely, rather rapidly and somewhat concavely on both 



