Foraminifera/rowe the Coast of Norwaxj. 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. 98. pi. 15. f. 27-29. 

 5J «^ 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 Archiv f. Anat. 1856, p. 171. 

 pl.6B.f.4-6. 

 fOEufs de Mollusques*y Cornuel, Mem, Soc. Geol. France, 2 ser. iii. 

 ^ pl.4.f.36. 



I «^ Placopsilina scorpionisi, D'Orb. Prodrome Paleont. i. p. 259. no. 283. 

 ^ I Placopsilina Cenomana'i, D'Orb. ib. ii. p. 185. no. 758. 



[^Placopsilina Cenomana, Reuss, Vienna Transact, vii. p. 71 . pl.28.f.4,6. 



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 

 material small in proportion to the imbedded sandy matter, 

 which is considerable in quantity. 



One large individual (figs. 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 

 Spirolinaf irregularis, &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 Wehbince, As 

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

 sideration. 



\ The Spirolince 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 pecuharities of structure. 



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



