1915- ^O- 12. THE STROPHOMEMDAE OF THE KRISTIAMA REGION'. I 13 



Pace 

 Fig. 7. Amphistropfna eiiglyphoides n. sp. \'entral valves. — 9 c .near 



9 d Lango off Holmestrand. Coll. J. Kiær 65 



8. — Ventral valves showing interior characters. Hor., loc. 



and coll. as preceding 65 



9. — Dorsal valve. — 9, probablj- Lango 65 



10. Strophomenal hemispherica Schmidt. — 3 c y, Killingen near Kristi- 

 ania. Coll. W. C. Brøgger 45 



Plate VII. 



Fig. I. Palaeostrophomeiia concava Schmidt. Dorsal valve. The shell 

 substance of the posterior portion has later on been re- 

 moved by acid and the cavities, thereby produced, 

 corresponding to cardinal process and crural plates, were 

 quite as in fig. 2 . — 3 c a. Huk near Kristiania. 

 Coll. on pxcurs. with students 43 



'2. — Dorsal valve with shell substance removed in f>osterior 



portion. — 3 c (i, Huk near Kristiania. Coll. J. Kiær . . 43 



-, 3. Strophotnena Breggeri n. sp. Dorsal valve with shell substance 

 removed in posterior portion. — 4 b. Bratterud, Ringe- 

 rike. Coll. J. Kiær 49 



54. — Specimen with convex ventral and concave dorsal valve. 



Hor., loc, and coll. as preceding 49 



» 5. — .\ dorsal valve and an external mould of a ventral one. 



Hor., loc, and coll. as preceding 49 



^ 6. Amphistropfna Davidsoni n. nom. Dorsal valve with shell sub- 

 stance removed in posterior portion. — 6, Malmokalven, 

 Bundeijord. Coll. unknown 64 



> 7. — Fragmentary free specimen. — 6, Malmo, Bundefjord. 



Coll. unknown 04 



8. Sfrophomena Keilhaui n. sp. Two dorsal and a ventral valve. 



5 b, Helgo near school house», Mjøsen district. Coll. J. Kiær 55 



Plate VIII. 



Fig. I. Strophomena Asmusi Verx. In the lower part of the slab, in the 

 middle, a ventral valve, higher up to the left an outer 

 mould of another, to the right a complete dorsal valve. 



— 4 b, Bratterud, Ringerike. Coll. J. Kiær 51 



!■ 2. — Dorsal valve with shell substance removed in posterior 



part, showing the cavities corresponding to the branches 



of the cardinal process and the crural plates. — Hor.. 



loc, and coll. as preceding 51 



-> 3- — Ventral and dorsal valve with shell substance removed. 



Hor., loc. and coll. as preceding 51 



» 4- — Relatively long type. External mould of ventral valve. 



— 4 b. Coelosphæridium zone, Fangberget, Mjosen di- 

 strict. Coll. O. Holtedahl 52 



^5- — Relatively- long type. Dorsal valve. Hor., loc, and coll. 



as preceding 52 



» 6. — Dorsal valve with shell substance removed in posterior 



part. — 4 c, Shore of the Randstjord, south of Røiken- 



\nk. Hadeland. Coll. O. Holtedahl 52 



Vid.-Selsk. Skrifter. I. M.-N. Kl. 1915. No. 12. 8 



