Tancredia. Ltcett. 

 Tancredia sp. cf. angulata. Lycett. 



PI. VI, fig. 18. 



1853. Lycett, J. Description of some new species of Mollusca from the 

 Lincolnshire Oolites, see: Morris, J. On some sections in the oolitic 

 district of Lincolnshire. Quart. Journ. Geol. Soc. vol. 9, p. 341, 

 tab. 14, fig. 5. 



1S53. Morris, J., and Ltcett, J. A monograph of the Mollusca from the 

 Great Oolite. Printed for the Palæontographical Society. London. 

 Part П, Bivalves, p. 94, tab. XIII, flg. 9 a and b. 



Three specimens consisting of casts and shells, but with 

 the outer side embedded in brown sandstone, were found in 

 Mount Nathorst. These resemble Tancredia angulata^ Lycett, 

 but are larger than the figures quoted above. 



The specimen much resemble the casts of Tancredia 

 donaciformis, Lyc. an angidata, Lyc. in the Munich Collection, 

 which came from the «brown Jura /9» (Murchisonæ-zone) of 

 Heininger Wald near Boll; the largest Greenland specimen 

 is, however, more convex and shows but faint indications of 

 the broad groove on the surface of the cast, which passes 

 diagonally from the umbo towards the posterior end. A second 

 Greenland specimen is also more convex and narrower and 

 either does not show the groove at all, or gives but the faintest 

 possible indication of it. 



The largest specimen from Greenland is 46""" long and 

 22inm ^ide; the second is 35""" long and 18""" wide. 



Tancredia angulata is quoted by Woodward ^) from the 

 Passage Beds (Opalinum-zone) and from the Fuller's Earth, Clay 

 and Rock; also from the Great Oolite and Stonesfield Slate of 

 Somersetshire, Gloucestershire and Lincolnshire in England. 



Woodward, H. B. 1894, p. 571. 



