19*5- No. 12. THE STROPHOMENIDAE OF THE KRISTIANIA REGION. 



From Stage 5: Leptaetia transversalis Dalm. L. transv. var. major. Stro- 



phometia r/iomèoida/is Wahl: S. eu g/y p/ia Dalm. S. /um-. 



culota M'CoY(?). S. teuiiislriata Sow. 

 » » 6—7: Stroplionwna cuglypha Dalm. S. rhomboidalis Wahl. 



S. funiatlata M'Coy. 

 » » 8: Strophotnena rhomboidalis Wahl. S. euglypha Dalm. 



S. pecten Linn. 



The only paper in which Norwegian Strophomenids are more S3'ste- 

 matically and paleontologically treated is Brogger's »Die Silurischen Etagen 

 2 und 3 im Kristianiagebiet und auf Eker* ^ 



On page 50 of this paper the following are mentioned : 



Strophomena rhomboidalis Wilckens var. (pi. XI fig. 5. See the 

 present paper p. 43 1 a form that is regarded as precursor}' of the true 

 S. rhomb, of younger beds. The distinguishing characters cannot be 

 determined as the interior is not known. 



Strophomena imbrex Pander, var. confr. setttiglobosa D.w. (pi. XI, fif^. 6. 

 See present paper p. 14I. 



The material of this form also being poor, no final determination has 

 been made. It is further mentioned that at least two more forms of 3 c 

 have been found, but the material present is too scarce for further identi- 

 fication. 



In the year 1884. in a paper »Spaltenverwerfungen in der Gegend 

 Langesund — Skien« - Brogger gives a revised stratigraphical classification 

 of the Ordovicic series in the district mentioned, without however, pro- 

 viding a complete list of fossils. On p. 261. &c, he mentions: 



From Stage 4 b : Small Leptaena (of the L. sericea group). 



> > 4 c: Slroph. imbrex Pander var. augusfior. S/r. rhomboidalis, 



Leptaena cf. sericea Sow. var. and other Leptaenas. 

 » » 4 d : Strophomena and Leptaena species. 



* » 4e: Strophomena confr. Asmussi Eichw. 

 ^ > 4 f : Leptaena sericea Sow. var., Strophomena confr. Asmussi 



Eichw. var., Stroph. rhomboidalis Wilck. var. 

 » » 4 h : Platystrophia insularis Eichw. var. Strophomena confr. 



luna TÖRNQLIST. Str. rhomb., Str. semipartita Fr. Romer. 



Leptaena confr. Schmidti Törnqlist. 



* University Sj'llabus for and term 1882. 



^ NVt Magazin for Naturvidenskaberne, Vol. a8. 



