OLAF HOLTEDAHL. M.-N. Kl. 



In this fundamental paper he publishes (pp. 92—98) lists of fossils 

 occurring in the different stages (Etagen), and minor zones, into which he 

 divides the stratified series of the Kristiania region. The following Stro- 

 phomenids are mentioned; (the various stages do not, however, always 

 embrace what they do according to the modern stratigraphical standard 

 of the region). 



From Stage 4: Ortliis peden Dalm, Leptaena sericea Sow. Leptaena 



( Strophomena) tenuistriata Sow. Z. imbrex s. trans- 

 versa Vern. 

 » » 5 ct: Leptaena rtigosa Dalm, Leptaena imbrex Vern. 



» » 5 /î^: Or this pccten Dalm, Leptaena (Strophomena) depressa 



Dalm, Leptaena transversalis Dalm, Spirifcr insularis 

 Vern. 

 » » 7 a : Leptaena eug'ypha Dalm. 



» » 8 a : Leptaena transversalis Dalm. 



» » Qß—y: Strophomena peden Llnn. Leptaena depressa Dalm. 



Leptaena riigosa Dalm. L. transversalis (?) Dalm. 

 L. lœvigata (?) Sow. 

 T. Dahll, the collaborator of Kjerulf, gives in the same paper a 

 classification of the Cambro-Siluric series in the district of Skien — Lange- 

 sund and mentions the following species of Strophomenidae (pp. 117 &c): 

 From Stage 4 a : Orthis peden, Strophomena expansa, Leptaena tenuistriata. 

 T> » 4b: Orthis peden, Strophomena compressa, S. complanata. 



T> » 5 a : Leptaena tenuistriata, transversalis (?). 



» » 5 c: Orthis peden, Leptaena sericea. 



» » 5 d : S. complanata. 



» » 7 a : Leptaena transversalis, Leptaena depressa. 



» » 7 b: Leptaena depressa, L. transversalis, L. antiquata, S. fnni- 



dilata. 

 » » 8 c: Leptaena depressa, Leptaena euglypha. 



A list of more recent date is given by Kjerulf in »Veiviser ved geo- 

 logiske excursioner i Christiania omegn« ^ 



He cites: 

 From Stage 3: Strophomena an triangularis Pand., St) ophomejia an trans- 

 versa Pand. 

 » » 4: Leptaena sericea Sow. Stroph. sp. n. (»large with promi- 



nent transverse wrinkles« -). 



1 (Guide to Geo!. Excursions in the Vicinity of Christiania). University Syllabus 1865. 



2 Undoubtedly the Leptaena Kjerulfi n. sp., see p. 72. 



