FORAMINIFERA FROM THE NORTH ATLANTIC AND ARCTIC OCEANS. 
387 
Discorbina Turbo, D’Orbigny, sp., Var. Parisiensis, D’Orbigny, sp., Subvar. Berthelotiana, 
D’Orbigny, sp. Plate XVI. figs. 26, 27 (North Atlantic). 
Discorbina Berthelotiana, D’Orb., sp. (For. Canar. pi. 1. figs. 28-30), may be regarded 
either as a compressed and more or less limbate form of D. globularis, D’Orb., sp., or, 
rather, as intermediate to D. globularis , D’Orb., sp., and D. Parisiensis , D’Orb., sp. (Mo- 
deles, No. 38), but without the ornamentation below. It is generally small ; usually 
showing an umbilical flap or angle ; but in fig. 27 a granule represents it. This variety 
makes a near approach to the strongly limbate Discorbina Binkhorsti , Reuss, sp. (Sitz. 
Akad. Wien. 1861, vol. xliv. pi. 2. fig. 3), of the Maestricht Chalk; and, though it 
resembles some of the margined Grlobigerinoe of the Chalk, it has no relationship with 
them. 
Our fig. 26 is much more limbate than the specimen figured by D’Orbigny ; but they 
are essentially the same. 
D. Berthelotiana occurs on the marginal plateau off Ireland, small and rather common 
at 78 fathoms, and small and rare at 43 fathoms. 
Genus Rotalia. 
Botalia Beccarii , Linn., sp. (Varieties). Plate XVI. figs. 29-34 (North Atlantic). 
Botalia has a finely porous shell (coarser than that of Pulvinulina and finer than Cal- 
carina) ; biconvex (lowest side thickest), with round margin ; made up of from thirteen 
to forty chambers, with double septa ; canal-system present. Septal lines and umbilicus 
often beaded with exogenous granules, sometimes to a great extent. Aperture a slit 
(occasionally subdivided), sometimes notched at the umbilical margin of the septal 
plane, as in Pulvinulina, Discorbina, and arrested Planorbulinoe. Shell rarely prickly ; 
occasionally Asterigerine ; generally small, compared with most other Rotalines ; or, 
rather, it does not attain to quite as great a size. 
Scheme of the chief subspecies of Rotalia. 
Rotalia Schroeteriana, Parker and Jones. See Carpenter, Introd. For. pi. 13. figs. 7-9. 
omata, D’Orb., sp., For. Amer. Mer. pi. 1. figs. 18-20. 
— — craticulata, Parker and Jones. Plate XIX. fig. 12. (Fiji.) . 
annectens, Parker and Jones. Plate XIX. fig. 11. (Hong Kong.) 
pulcliella, D’Orb., sp., For. Cuba, pi. 5. figs. 16-18. See Carpenter, Introd. For. p. 213. 
dentata, Parker and Jones. Plate XIX. fig. 13. (Bombay Harbour.) 
Beccabii, Linn. D’Orbigny’s Modeles, No. 74. This is the Type species. 
• ammoniformis, D'Orb. Ann. Sci. Nat. vol. vii. p. 276. No. 53. (After Soldani.) 
lobata, D’Orb., sp., For. Cuba, pi. 5. figs. 19-21. See Carpenter, Introd. For. p. 213. 
carinata, D’Orb., sp., For. Cuba, pi. 5. fig. 25, pi. 6. figs. 1, 2. 
Soldanii, D’Orb. Modeles, No. 36. 
umbilicata, D’Orb. Ann. Nat. Sci. vol. vii. p. 278. No. -4, and Mem, Soc. Geol. Fr. vol. iv. pi. 3. figs. 4—6. 
orbicularis, D’Orb. Modeles,, No. 13. 
