112 OLAF HOLTEDAHL. M.-N. Kl. 



Page 

 Fig. 3. Brachyprion explicatitin n. sp. External mould of a nearly flat dorsal 

 valve. — 8 c, Ormø, Bundefjord. Coll. on excursion with 



students 38 



» 4. — Ventral valve. — Hor., loc,, and coll, as fig. 2 . . . . 38 



» 5. — External mould of dorsal valve. Hor., loc., and coll. as fig. 2 38 



» 6. Brachyprion seniig/obosiun Dav. var. norvegicuni n. sp. Relatively 

 flat ventral valve. — 9 d. Langø ofT Holmestrand. 



Coll. J. Kiær 36 



» 7. — Internal mould of ventral valve. Hor., loc, and coll. 



as preceding 36 



» 8. — Dorsal valve from inside, shell substance partially re- 



moved. — 8 d, Malmø, Bundefjord. Coll. J. Kiær ... 36 

 » 9. — Relativel}' large ventral valve with worn surface. 



Hor., loc, and coll. as preceding 36 



Plate V. 



Fig. I. Brachyprion philonieliini Bill. Ventral valve and external mould 

 of dorsal. — 7 b a, Limaastangen, Ringerike. Coll. 

 Th. Münster 35 



» 2. — Ventral valve. — 7 a, Bjerkø off" Holmestrand. Coll. 



unknown 35 



» 3. — Ventral valve. Hor., loc, and coll. like fig. i 35 



» 4. — ? External mould of dorsal valve with shell substance 



partially in place. — 9 d, Langø, Holmestrand. Coll J. Kiær 35 



» 5. Brachyprion or Rafmesquina sp. Internal mould of ventral valve. 

 — 6, Greverud, Asker. Coll. J. Kiær. 



» 6. Brachyprion Walmstedti Lindstr. Ventral valve with very sharp 

 cardinal angles. The posterior portion of the muscular 

 field can be seen as mould. — ■ 8 b, Jevnaker, Hade- 

 land. Coll. J. Kiær 39 



» 7. — - .A. slab with a number of external moulds of dorsal 

 valves. — 8 c, near Gjerpen chapel. Skien — Lange- 

 sund district. Coll, J. Kiær 39 



» 8. — External mould of dorsal valve with portions of the 

 shell substance of both valves preserved. — 8 b, 

 Bragsø, Ringerike. Coll. J. Kiær 39 



Plate VI. 



Fig. 1. Sirophouiena (l)Jentzschi Gaqki.. External mould ot ventral valve. — 



Transitional beds 3 c ß — 3 c;/. Vækkerø near Kristiania. 



CoH. Th. Kjerulf 46 



» 2. Strophomena pseiidodeltoidea Stoll. External mould of ventral 



valve. — 5 a, Vestre Svartø, Ringerike. CoH. Th. Münster 47 

 » 3. — Dorsal valve. — 5 a, Vestre Svartø, Ringerike. Coll. 



J. Kiær 47 



» 4. Strophomena cf. pseudodeltoidea Stoll. Free specimen, seen from 



the dorsal side. — 6 a, Hvalsbakken, Asker. Coll. unknown 48 

 » 5. Strophonella eitglypha His. External mould of a relatively flat 



ventral valve. — 9d, Langø off Holmestrand. Coll. J. Kiær 66 

 » 6. — External mould of ventral valve with typical genicula- 



tion. Hor., loc, and coll. as preceding 66 



