1898-1902. No. 32.] FOSSIL FAUNAS FROM SERIES B. 47 



Expedition 1 have been able to identify in a black limestone, which is 

 distinctly different from the more light-colored, grey or brown, limestone, 

 with L. plioca, a fauna that is not only Devonian, hut beyond all doubt, 

 high Devonian, its age probably corresponding with the Chemung. The 

 fossils are the following : 



Schizophoria striatula SCHLOH., two specimens, one showing clearly 

 the interior characters of the ventral valve. 



Atrypa reticularis LIN., numerous large, coarsely plicated and 

 wrinkled specimens. 



Spirifer wliitneyl HALL, var. animasensis GIRTY, one complete 

 and several fragmentary specimens. Spirifer tvhitneyi is a typical Chem- 

 uing form and the closely related variety animasensis is described from 

 the lower part of the Ouray limestone of Colorado which is partly high 

 Devonian, partly lower Carboniferous. 



Cyrtina gjoai nov. sp. PL VI, fig. 8. A considerable number of 

 well preserved specimens occur of this form, which though much like 

 several of the American Devonian Cyrtinas, do not fully agree with 

 any of them. The specimens are very small, greatest width observed 

 9 mm., corresponding to a length of 6.5 mm. Ventral valve is globose 

 hemi-conical with the height varying greatly from less than the width 

 to considerably more. On both sides of a relatively broad but not 

 deep, in section subtriangular, sinus, 4 5 rounded folds, the more central 

 of which are well marked. The subtriangular area have the sides a 

 little curved outwards, the form of the area of the elevated specimen 

 therefore like the half of a transverse section of a thick lens. Width of 

 the prominant pseudodeltidium one third of the total width of the area. 

 Adult specimens, show marked striae on the area and wrinkles of growth 

 on the broader part of the valve. The dorsal valve is semi-elliptical in 

 outline, slightly convex with a quite prominent round median fold and 

 4 5 smaller folds on each side. Adult specimens show one or more 

 lines of growth near the rounded margin. 



This form comes nearest to Cyrtina dalmani HALL from the lower 

 Helderberg, but is distinctly more globose, less acute towards the apex. 



Loxonema sp. ?, very fragmentary. 

 Straparollus sp., 

 Platyceras sp., 



