1881. 
1882. 
1883. 
1885. 
? 1889. 
1893. 
? 1894. 
1895. 
1896. 
1897. 
1900. 
Non 1827. 
— 1846. 
Description. Sl 
ereater than leneth 
PECTEN. 147 
Prcren LAmrnosus, Dames. Ibid., p. 764. 
H. Deicke. Die Tourtia von Miilheim a. d. Ruhr, p. 26. 
A. Fritsch. 
Stud. im Gebiete der bohm. Kreideformat. : 
II, Die Weissenberg. und Malnitz. 
Schicht., p. 156, fig. 126. 
Zeitschr. d. 
vol. xxix, p. 233. 
Schrift. d. nat. Gesellsch. in Danzig, 
N. F., vol. v, p. 415. 
Windndller. 
—— ORBICULARIS, G. Boehm. deutsch. geol. Gesellsch , 
— J. Kiesow. 
Jahrb. d. k. preussisch. geol. 
Landesanst. fiir 1881], p 20. 
Foss., ete., Neve. Upware 
— cf. oRBICULARIS, R. 
—  ORBICULARIS, var. MAGNUS, W. Keeping. 
and Brickhill, p. 106, pl. v, fig. 1. 
- (SyncycLonema) orpicuanis, I’, Nitling. Die Fauna d. baltisch. 
Cenoman. (Palaeont Abhandl., 
vol. ii), p. 19, pl. iii, figs. 4, 5. 
Tbid., p. 19, pl. iii, fig. 3. 
Verhandl. des 
= : LAmINosus, Notling. 
SYNCYCLONEMA SUBLAMINOSA, J. Bihm. tat. Vereins d. 
preussisch. Rheinl., vol. xlii, p. 83. 
PecreN Laminosus, FE. Holzapfel. Die Mollusk. Aachen. Kreide (Pale- 
ontographica, vol. xxxv), p. 231, 
Zeitschr. d. 
vol. xlv, p- 256. 
-—  oRBIcULARIS, R. Michael. deutsch. geol. Gesellsch., 
= LAMINOSUS, Michael. Ibid, p. 235. 
—  orxicuLAnis, A. Hennig. Geol. Foren. i Stockholn Forbandl., 
vol. xvi, p. 519. 
— Corratpinus, G. Maas. Zeitschr. d. deutsch. geol. Gesellsch., vol. 
xlvii, p. 269. 
—  ORBICULARIS, var. LoHMANNI, A. Wollemann. Ibid., vol. xviii, p- 
839, pl. xxi, fig. 1. 
Geognost. Jahreshefte, N. J. (1896), 
p. 40, pl. iv, fig. 8. 
Proc. Dorset Nat. Hist. and 
Antiq. Field Club, vol. xviii, 
p. 84, pl. iii, fig. 9. 
Wollemann. Die Biv. u. Gastrop. d. deutsch. 
u. hollind. Neocoms (Abhandl. 4. k. 
preussisch. geol. Land., N. F., pt. 31), 
p. 41, pl. viii, figs. 13—19. 
U. Sochle. 
SYNCYCLONEMA ORBICULARIS, R. B. Newton. 
Precrren Germanicus, A. 
Precren orpicunaris, S. Nilsson. Petrif. Suecana, p. 23, pl. x, fig. 12 
(= P. Nilssoni, Goldf.). 
?, H. Forbes. Trans. Geol. Soc., ser. 2, vol. vii, p. 154 
, i 
(= Amusium sulcatellum, Stol.). 
iell ovate or nearly orbicular, nearly equilateral; height a little 
; margins on each side of the umbo straightened, that on the 
posterior side being slightly longer than the corresponding anterior part. Valves 
