Foraminifera^'om the Coast of Norway. 301 



160 fathoms ; and similar forms occur at 40, 60, and 70-100 

 fathoms. Fig. 37 is from 30 fathoms, and was accompanied by 

 two similar specimens. 



26. Placopsilina Canariensis, D^Orb., sp. PI. X. figs. 13, 14. 



^Nucleus minusculus limosus, &c., Soldani, Saggio orittograf. p. 99. pi. 1 . 

 f. 10. 

 Nonionina Canariensis, D'Orb. Hist. Nat. Canaries, p. 128. pi. 2. f. 33,34. 

 Spirolina cequalis, S. lagenalis, S. irregularis, Roemer, Nordd. Kreid. 

 p. 9S. pi. 15. f. 27-29. 

 SJ «^ Spirolina irregularis, Reuss, Bohm. Kreid. i. p. 35. pi. 8. f. 62-66, 75. 

 Spirolina agglutinans, D'Orb. For. Foss. Vienn. p. 137. pi. 7. f- 10-12. 

 Spirolina Humboldti, Reuss, Zeitsch. deutsch. geol. Ges.iii. p. 65. pi. 3. 



f. 17, 18. 

 Nonionina silicea, Schultze, Miiller's Arehiv f. Anat. 1856, p. 171. 

 L pi. 6 B. f. 4-6. 



~CEufs de Mollusques*, Cornuel, Mem. Soc. Geol. France, 2 ser. iii. 

 pi. 4. f. 36. 



.§ "^ Placopsilina scorpionis "? , D'Orb. Prodrome Paleont. i. p. 259. no. 283. 

 (*( I Placopsilina Cenomanal , D'Orb. ib. ii. p. 185. no. 758. 



\_Placopsilina Cenomana, Reuss, Vienna Transact, vii. p. 71 . pl.28.f.4,5. 



In our figured specimen the shell is discoidal, obtuse at the 

 margin, sunken at the umbilicus on each surface ; chambers 

 triangular on side-view ; increasing slowly in size ; about nine 

 in number in the outer whorl ; slightly overlapping the former 

 whorls. Shell rusty in colour, opake, arenaceous, the calcareous 

 matei'ial small in proportion to the imbedded sandy matter, 

 which is considerable in quantity. 



One large individual {tigs. 13 & 14; from 30 fathoms. Fin- 

 mark) and a few small ones have occurred in the Norway sands. 

 We have also found this Foraminifer in a few other dredgings from 

 the northern seas. Sometimes it is more depressed than the 

 specimen figured. 



The Nonionina-shaped shell here figured belongs to the same 

 genus as the crosier-shaped and Spirolina-like shells known as 

 Spirolina f irre(/ularis, &c., as well as the more irregular and 

 attached Foraminifers to which the term PlacopsilinaX is more 

 especially adapted. In all these the shell is arenaceous ; the 

 chambers are more or less closely set, usually increase very 

 gradually in size, and commence in a spiral arrangement, but 

 sooner or later go off" in a straight direction, with much irregu- 



* Together with these are figured {loc. cit. fig. 37) some Webhince, As 

 Webbina is probably distinct from Placopsilina, we leave it for future con- 

 sideration. 



■\ The Spirolinee of Lamarck (S. cylindracea and S. depressa) are con- 

 tracted varieties of Peneroplis, with the typical forms of which Spirolina is 

 united by Dendritina. All these retain their homogeneous shell-substance 

 without becoming arenaceous ; they have also other peculiarities of structure. 



X D'Orbigny, Cours Element. "Paleont. vol. ii. p. 199, 1852. 



