342 Prof. T. R. Jones on the 



" LeperdUia anticostiana, Jones. Upper Silurian ; Anticosti." 

 This is f inch long, f high. 



L. anticostiana belongs to the " Hudson-River group." 



5. Leperditia fahuUtes (Conrad). 



Cytherina fahtdites, Conrad, Philad. Acad. Nat. Sci. Proceed. 1843, 



vol. i. p.' 332. 

 Leperditia fahuliies, Jones, Ann. & Mag. Nat. Hist. 1856, ser. 2, vol. xvii. 



p. 89 ; ISoS, ser. 3, vol. i. p. 146 ; 1881, ser. 5, vol. viii. pp. 342-4. 

 Leperditia fabidites^ Whitfield, Report Geol. Wisconsin, vol. i. (1883) 



p. 160, fig. y. 



In the McGill University Museum. Labelled '' 61." 

 " Trenton." No locality mentioned. 



A narrow left valve (the left is always the smaller valve, 

 overlapped on the ventral edge) , | inch long and j\ high. 



Leperditia^ probably L.fahulites^ Conrad. This species 

 belongs to the " Trenton group." 



L. fahuUtes is stated to be abundant among the Trenton 

 fossils of Mineral Point and elsewhere in Wisconsin (' Report 

 Geol. Wisconsin,' vol. ii. 1877). 



Note. — '' Cytherina indeterra.," Hall, Pal^eont. New York, 

 1847, vol. i. p. 44, pi. x. fig. 12 ; from the " Bird's-eye Lime- 

 stone," and said to be similar to one from the " Trenton 

 Limestone," may be L. fahuUtes (Conrad). 



6. Leperditia amygdalina, Jones. 



Leperditia amygdalina, Jones, Ann. & Mag. Nat. Hist. 1858, ser. 3, 

 vol. i. p. 342 ; Geol. Surv. Canada, dec. iii. 1858, p. 97, pi. xi. figs. 18, 

 19 ; Ann. & Mag. Nat. Hist. ser. 5, vol. viii. 1881, p. 344, pi. xix. 

 tig. 9. 



In the McGill University Museum. Lahelled " 594." 

 Chazy Limestone. A slab of black limestone with the hollow 

 insides of numerous valves showing on a bed-plane ; their 

 edges are broken off. Some valves are scattered about in the 

 substance of the slab. The valves, about | inch long, seem 

 to belong to Leperditia amygdalina (?), Jones. 



" 603." " Leperditia^ Chazy, McNab," Ontario, Upper 

 Canada. In dark grey limestone composed of tests, about 

 -1 inch long. L. amygdalina (?), Jones. 



7, 8. Leperditia alta (Conrad), et L. Jonesi^ Hall. 



Ctftherina alta, Conrad, in Vauuxem's Geol. Report New York, 3rd 



District, 1842, p. 112, fig. 23, no. 6; Hall, Pal^ontol. N. York, 



1852, vol. ii. p. 338, pi. Ixxviii. fig. 2, a, b, c, d, 



Lefrditia alta, Conrad, sp. {?), Jones, Ann. & Mag. Nat. Hist. 1856, 



ser. 2, vol. xvii. p. f<S, pi. vii. figs. 6, 7 ; 1858, ser. 3, vol. i. p. 250, 



. pi. X. figs. 8, 9. 



