FROM NORTH AMERICA, WALES, AND IRELAND. 25 



Fig. 20, in PI. III., is a minute Leperditian valve of the same 

 shape as L. Tiuchonica, but not quite so hi^h in proportion. Its 

 cardinal angles are too strong for Leperdhja (Isochilina) minuiis- 

 shna^ Hall ; and it is less Leperditioid in st ?, having more equal 

 ends, thus approaching Leperditia anna, Jo. js (1858), in outline. 

 It is from one of the Cincinnati limestones, associated with Primitia 

 minuta (PI. III. figs. 18, 19) and yEcJimina Bi/rnesi (PI. III. 

 figs. 9-11), Given to me long ago by Dr. E. W. Claypole, F.G.S. 



L. subquadrata of Pennsylvania (Claypole Collection) is a true 

 Leperditia^ and nearly allied to L. hudsonica, 



4. Leperditia Clatpolei, sp. nov. (PI. III. figs. 17 «, b, c.) 



Size : length -66 mm., height "45 mm., thickness "2 mm. 



Minute, suboval, cardinal angles not being developed at the ends 

 of the nearly straight back ; ends nearly semicircular, ventral border 

 elliptically curved ; compressed, especially at one end (anterior) and 

 along the dorsal region. This is less Leperditioid in shape and much 

 less convex than Hall's Leperditia (Isochilina) minutissima, 'Tweuty- 

 fourth Report N.-Y. State Museum I^at. Hist.' 1871-72, p. 231, 

 pi. viii. fig. 13 [right valve] ; ' Geol. Surv. Ohio,' vol. ii. pt. 2, 1875, 

 p. 102, pi. iv. fig. 4 [right valve]. The ventral border having a 

 slight flange (not shown in the figure), allowing an overlap, we can 

 regard this little valve as belonging to a true Leperditia. 



It occurs in one of the Cincinnati limestones with Beyrichia ciliata. 

 collected years ago by Prof. E. W. Claypole, D.Sc, E.G.S., whose 

 energetic geological work in the United States has supplied me with 

 numerous specimens of Palaeozoic Ostracoda, and after whom it 

 is here named. 



5 & 6. Leperditia alta (Conrad), and L. Jonesi, Hall. (L. alia, 

 var., PI. I. figs. 6 a, b ; after the original drawings.) 



Cytherina alta, Conrad *, ' Third Annual Eeport on the Palaeontol. 

 Departm. of the Survey, N.Y., 1840, p. 204. 



Cytherina alta, Yanuxem, 'Natural History of New York, 

 Geology, Part III. Survey of the Third Geological District,' 1842, 

 p. 112, fig. 23, no. 6 (bad drawing) ; co])ied in Emmons's 'Manual 

 of Geology,' 2nd edit. 1860, p. 113, fig. 162, no. 6; and in L. 

 Lincklaen's " Guide to the Geology of New York," in the ' Four- 

 teenth Annual Report of the Regents of the University, State N. Y.' 

 1861, p. 58, fig. 19, no. 6 (pi. ix. fig. 6). 



Cytherina alta (?), Hall, 'Pala3ont. New York,' vol. ii. 1852, p. 338, 

 pi. Ixxviii. figs. 2«, b, c, d [figs, a & b, alta; c(?) & d, Jonesi], 



Leperditia alta (?), Jones, ' Ann. & Mag. N. H.' ser. 2, vol. xvii. 

 1856, p. 88, pi. vii. figs. 6 & 7 [fig. 6, Jonesi ; fig. 7, alta]. 



Leperditia alta, Jones, 'Ann. & Mag. N. H.' ser. 3, vol. i. 1858, 

 p. 250, pi. X. figs. 8 & 9. 



Leperditia alta, Hall, 'Palaeont. N. Y.' vol. iii. pt. i. 1859, p. 373 



* See Dr. James Hall's Preface to the ' Paleeont. New York,' vol. i. 184G, 

 pp. X, xi. 



