32 OLAF HOLTEDAHL. M.-N. Kl. 



• Rafinesqaina (?) Schmidti Gagel. 



(PI. Ill, fig. I.) 



1890. Strophomena Schmidti Gagkl. Die BrachiopoJen d. cambr. u. sil. Geschiebe im Dil. 

 Ost- u. Westpreuêens, p. 42, pi. III, fig. 4. 



A single, very large ventral valve, of subtriangular outline and with 

 deflected margin, is all that is present. 



The large centra! disc is nearly flat, slightly convex in the circum- 

 bonal region, latero-frontai margin deflected at an angle of about 120 ^ 

 laterally, at the front still more obtusely. The length of the deflected 

 margin in the median line is about V2 of ^he length of the central disc. 

 The exact border at the front cannot be seen. 



The surface of the valve is badly worn, so that the detailed characters 

 cannot be exacfly studied except in a few places. The radiating striæ 

 are rather coarse, in the region of the cardinal angles fairly uniform, 

 towards the front of two sizes, one or two finer ribs occuring between two 

 stronger ones, the distribution, however, being very irregular. The central 

 disc shows a large number of irregularly arranged corrugations, rather 

 faint and not continuous for any considerable distance. Because of the 

 worn surface no good illustration of them can be given. 



Observations. Gagel in his very brief description of Stropho- 

 mena Schmidti gave the diagnosis: »Grofà, von halbkreisförmigem Umrifà...« 

 this semicircular outline not exactly agreeing with that of the specimen 

 described above, that is rather long and narrow If we compare Gagel's 

 fig. 4 b with the section of the same specimen given, it is evident however 

 that the central disc of that specimen cannot have been so very broad and 

 short. In all other essential features the forms seem to be identical. As 

 nothing is known of the interior, the generic relation of this form cannot yet 

 be decided with certainty. We might have here a relatively long Lcptaena. 



Occurrence. 4d, basal part. Railroad-section Roa-Grindvoll, 



Hadeland. 



Raßnesquina 0) sp. (R. Schmidti Gagel ?^. 

 (PI. Ill, fig. 2.) 



The depicted outer mould of a dorsal valve, besides a still much more 

 fragmentary one is all that is found. 



Undoubtedly this form comes very near to the one just described, 

 and further studies on a larger material may prove their identity. The 

 difference lies in a somewhat larger size in the form from Ringerike, 

 a somewhat differing, trapezoidal, outline and more strongly deflected antero- 



