PECTEN. 161 
1892. Percren vireatus, F. Vogel. Verhandl. nat. Vereins d. preussisch. Rheinl., 
vol. xlix, p. 55. 
? 1893. — of. curvatus, R. Michael. Zeitschr. d. deutsch. geol. Gesellsch., 
vol. xlv, p. 236. 
Pp — —  curvatus, A. Fritsch. Stud. im Gebiete der béhm. Kreideformat. : 
V, Priesen. Schicht., p. 100. 
? 1895. — (Campronectes) vireatus, F. Vogel. Hollindisch. Kreide, p. 23. 
? 1897. —  curvatus, A. Fritsch. Stud. im Gebiete der béhm. Kreideformat. : 
VI, Die Chlomek. Schicht., p. 68. 
PP — —  vireatus, A. Rutot. Bull. Soc. Belge Géol., etc., vol. x, p. 30. 
yo — —- R. Leonhard. Die Kreideformat. in Oberschles. (Pale- 
ontographieca, vol. xliv), p. 26. 
? 1900. —_ — C. Gagel and F. Kaunhowen. Jahrb. d. k. preussisch. geo). 
Landesanst. u. Bergakad. fiir 1899, p. 231. 
Non 1827. —  arxcuatus, S. Nilsson. Petrif. Suecana, p. 22, pl. ix, fig. 4. 
==" == —  vireatus, Nilsson. Ibid., p. 22, pl. ix, fig. 15, 
S37. — “= W. Hisinger. Letheea Suecica, p. 52, pl. xvii, fig. 3. 
— — arcuatus, Hisinger. Ibid., p. 52, pl. xvii, fig. 2. 
oe —— 1846: —  vireatus, H. Forbes. Trans. Geol. Soc., vol. vii, p. 154, pl. xv, fig. 22. 
? — 1852. — — F. Rimer. Die Kreidebild. von Texas, p. 66, pl. viii, fig. 5. 
— 1866. — -- K. A. Zittel. Die Biv. der Gosaugeb. IT (Denkschr. d. k. 
Akad. Wissensch. Math.-nat. Cl. Wien, 
vol. xxv, pt. 2), p. 109 (33 of reprint), 
pl. xvii, fig. 8. 
? — 1871. —  (CampronecteEs) curvatus, F'. Stoliczka.  Paleont. Indica, Cret. 
Fauna 8. India, vol. ii, p. 433, 
pl. xxxi, figs. 15, 16; pl. xli, 
figs. 4—6. 
2? — 1884. Campronecrss curvatus, J. F. Whiteaves. Mesozoic Fossils, vol. i, pt. 3 
(Geol. and N. H. Survey, Canada), 
p. 242, pl. xxxii, fig. 4. 
— 1897. Prcren vireatus, A. Hennig. Revis. Lamellibr. i Nilsson’s * Petrif. Suec.’ 
(Kon. Fysiogr. Sillsk. Lund. Handl., 
N. F., vol. viii), p. 41, pl. ii, figs. 28, 33; 
pl. iii, figs. 32, 33. 
Remarks.—This species closely resembles P. striato-punctatus, Romer, but 
generally possesses fewer ribs, and is, on the average, of smaller size. I have 
seen only two English specimens. One is aright valve from Great Haldon, 10 mm. 
in length and 11 mm. in height, with well-marked radial ribs on the ears crossed 
by much smaller concentric ribs. Another example, from the Chloritic Marl of 
Kastbourne, is 9 mm. in length and also in height. Without more English speci- 
mens, and without the opportunity of comparing them with collections of the 
foreign forms described as P. virgatus, ete., it is useless to attempt to discuss the 
relation of this to other Upper Cretaceous species. 
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