On Jurassic and Cretaceous fossils from North-East Greenland. 475 



44. Tancredia axiniformis Phillips sp. 

 PI. XXXV, fig. 1. 



(1829) 1835. Nucula axiniformis Phillips, Geology of Yorkshire. I. PI. 11, fig. 13. 

 1850. Tancredia extensa Lycett, Fossil Shells from the Inf. Oolite, p. 407 ; PI. 11, 



fig- »• 

 1854. axiniformis Phii.l. ; Morhis and Lycett, Mollusca from the Great 



Oolite. III. p. 93; PI. 12, fig. 7 and PI. 13, 

 fig. (i. 



The shell rather flat, triangular-oval, elongated. The umbo almost 

 in the middle, pointed. The anterior and posterior margins almost 

 straight, passing very abruptly into the slightly curved ventral margin. 

 The front part of the shell less arched than the posterior part. In 

 the neighbourhood of the posterior margin a somewhat rounded, 

 but very- distinct radial ridge; the region behind this somewhat 

 concave. The surface of the shell with fine lines of growth. 



Height ca. 13 mm, length ca. 24 mm, thickness (of a single valve) 

 ca. 2*5 mm. 



All the available specimens are badly preserved; they seem to 

 agree very well with Morris and Lycktt's fig. 7, PI. 12. — Along 

 with this a portion of the cast of a right shell was found, which 

 possibly belongs to the same species. This seems to show, that each 

 valve has had a blunt cardinal tooth and an elongated, posterior, 

 lateral tooth. 



For the sake of comparison I have had specimens from Langrune 

 and Ranville (Calvados); the only difference between these and the 

 Greenland specimens seems to be, that the ventral margin in the 

 latter is a little more curved, thus causing the whole form to be a 

 trifle higher. 



Distribution. North -East Greenland: "Kloft I" on Store 

 Koldewey Island (5 spec, 1 with both valves). In free-lying stones 

 at "4. Saenkning" on the same island (3 valves). — On the south- 

 east slope of Muschelberg (Hochstetter's Foreland) at a height of 

 370 m above the sea (1 valve?). 



England: Inferior Oolite and Great Oolite. 



France: in Grand Oolite. 



45. Tancredia Jarneri n. sp. 

 PI. XXXV, fig. 3. 



A number of characteristic casts seem referable to all appearance 

 to a new species of the genus Tancredia. 



Description of the cast: strongly arched; the form somewhat 

 variable, oblong, triangular-oval. The anterior end rounded, some- 

 times rather pointed; the posterior end blunter; the ventral margin 

 rather slightly curved. The umbo almost median, little prominent. 



