KONGL. SV. VET. AKADEMIENS HANDLINGAK. BAND. 19. N:0 4. 



107 



F)"om Discorbina globigerinoides Pahk. tmd Jones it may be difficult to keep our 

 forin distinct. (Phil. träns. 155. 1, t. Ii), lio;. 7). 



Fig. "IQ''!: Discorbina (Rosalina) bulloides d'Orb. 

 Fiff. 263 b: The same more magniiied. 

 Fig. 263: side-view. 



Syn. Rosalina bulloides dOrb., 1839, (Juba p. 98, t. 3, ligg. 2 — 5. 



Cymbalopora bulloides Oarpent., Introd. 1862, p. 216. 

 Tretomphalus bulloides Mön., 1880, Meeresfami. Maurit. u. Seyoh. p. 98, t. 10, figg. 6 — 9. 



Discorbina Poeyi dOrb. 



Tab. VIII, figg. 264—265. 



Tliis remarkable form seeiiis just as little entitled to generic distinction from 

 Discorbina as the preceding. It is densely covered with ribs or knobs on its spire-side, 

 the apertural face being more scarce provided but with somewhat larger tubercles. 



It is more seldom met with on the chalk-bottom. According to Mr. d'Orbigny 

 who found bis specimens in great abundance among sea-weed, its true horae seems to 

 be in the littoral z(jne. 



Fig. 264: apertural side. 



Fig-. 265: side-view. 



Syn. Rosalina Poeyi 



" squamosa 



Cymbolopora Poeyi 

 Rosalina granulosa 



d'Orb., 1839, Ciiba p. 92, t. 3, figg. 18—20. 

 i/Orb., ibid. p. 91, t. 3, figg. 12—14^ 



Carpent., Iiitmd. p. 215; MoEB., Maurit. et Seych. p. 97, t. 10, figg. 1 — 5. 

 K.\RR., 1864, Leythakalk Wien. Beck.; Wien. Ak, Sitz.-Ber. 1. .'io, p. 710, 

 t. 2, fig. i4. 



Discorbina Bertlielotiana dOkb. 



Tab. VIII, figg. 266—268. 



This tiny spedes may be a pigmy only to a more developed form. It is extre- 

 mel}" thin, quite hyaline with very small and closely set pores. It is dev^id of that 

 yellowish tint, so c^ommon with this genus. The shape is sometimes flat and scale- 

 like but often convex on the upper side: the hollowed apertural side with its promi- 

 nent riblike septal sutures are its most conspicuous characteristic. Sometimes those 

 ribs are sunken in septal furrows between the somewhat bulged chamberwalls. 



It is the tineness of the pores only which seems to distinguish this form from 

 some Planorhulina; f. instance. Planorb. Bosqueti Rss. (from Maestrich-chalk) being 

 nearly isomorphous with this species. 



