576 Karl A. Grönwall. 



The specimen occurs in a free-lying boulder {N.o 203) of the 

 fine-grained limestone from the Eskimo Naze; there is also another 

 specimen, probably of the same species, but almost concealed by the 

 rock. Of other fossils, the boulder contains only Alveolites sp. 



Of the species accessible to me in the literature, the species 

 that appears to offer the greatest analogies to our specimen, is Str. 

 Cornelliana Derby, which, however, has often grown fast, throughout 

 the whole of its length, with its growing-bed. (1874, p. 45; PI. 3^ 

 Figs. 28, 30, 32, 33, 35, 36, 37, 38; PL 4, Fig. 5; PI. 8, Figs. 1, 17; PI. 

 9, Figs. 10-11). 



N:o 14. Stroplialosia sp. indet. N:o 2. 



PI. XXVIII, Fig. 8-9. 



A specimen of the ventral valve, chiefly a mould with a small 

 fragment of the shell, obtained from the fine-grained limestone N:o 

 154^, from the Mallem ukfjæld, ought probably to be referred to the 

 genus Strophalosia, even though with some hesitation. 



The valve is triangular, rounded anteriorly; the height 12 mm. 

 and with the greatest width somewhat less, being 11 mm. immedi- 

 ately behind the anterior margin. The greatest arching of the valve 

 is at the irregularly formed beak, whence the valve slopes fairly 

 sharply towards the flanks, and more gently towards the anterior 

 margin. The hinge-line is about 5 mm. long and is almost straight. 

 The sculpture of the shell consists of finely radiating ribs on which, 

 here and there, a spine has been attached, starting from an elongated 

 base. On the poorly developed ears and on the flanks nearest to 

 the beak, the spines have been most numerous. Of concentric sculp- 

 ture the valve has had only weak, irregular wrinkles, most accentu- 

 ated on the umbonal part and vanishing towards the anterior 

 margin. 



Among the figures and descriptions of species belonging to the 

 genus Strophalosia, to which I have had access, especially in Waa- 

 gen and Netschajew, I have not been able to discover any species 

 with a similarly shaped valve, and, above all, there is none with a 

 similar irregular umbonal portion. The distinct indication of an area 

 below the hinge-line, and the evident scar of attachment at the point 

 of the beak, I consider, however, as being good reasons for referring 

 this form to the genus Strophalosia. 



N:o 15. Chonetella nasuta Waag. 



PI. XXVIII, Figs. 10—14. 

 Waagen 1882—84, pp. 657—660, PI. 81, Figs. 3-8. 

 RoTHPLETz 1892, p. 77, PI. 10, Figs. 12 and 16. 



