120 GOES, THE BETIOULABIAN BHIZOPODA OF THE CAHI15BKAN SEA. 



Cornuspira foliacca PHIL. 



Tab. IX, figg. 308310. 



This widely diffused form attains a pretty high development on the chalk-bottom 

 Its shape is very variable, according to the more or less rapid increase of the breadth 

 of its convolutions. Some of the more marked striae, which like septal-lines closely 

 adorn the surface, look very much like septa when viewed in transmitted light. 



It is not uncommon on the chalk-bottom. It seems to reach its hisrhest deve- 



o 



lopment in the arctic seas, where it occurs in shallow water sometimes in good 

 numbers. 



Fig. 308: a halfgrown specimen with more numerous and narrow convolutions. 



Fig. 309: large specimen with unusually sudden increase of the last convolution. 



Fig. 310: the edge with the aperture. 



Syn. Orbis foliaceus PHIL., 1844, Enumer. Mollusc. Sicil. 2, p. 147, t. 24, fig. 26. 



Operculina striata, plicata GZJZ., 1847, Poss. for. Wien. Beck.; Haiti, nat. Abh. 2. i, p. 140, t. 12, 



figg. 10-11; t. 13, figg. 1213. 



Spirillina foliaeea WILLIAMS., 1858, Brit. rec. for, p. 91, figg. 199201. 



Cornusp. rugulosa Rss., 1855, Tert. Sch. nordl. u. mittl. Dcutsclil.; Wien. Ak. Sitz.-Ber. 1. is, 



p. 222, t. 1, fig. 1. 



Operculina carinata, ammonitiformis COSTA, 1854, Pal. Nap. 2, p. 209, t. 17, figg. 15 10. 

 Cornuspira planorbis SCHULTZE, 1854, Org. Poly thai. p. 40, t. 2, fig. 21. 



Bornemanni Rss., 1863, Sept. Thon Offenbach, Wien. Ak. Sitz.-Ber. 1. 48, p. 39, I. 1, 



fig- 3. 



> Beussi (BORNEM.) Hss., 1865, Deutsch. Septarienthon; Wien. Ak. Dkschr. 1. 25. i, 



p. 121, t. 1, fig. 10. 



foliaeea PARKER et JONES, 1865, North. Atl. and Arct. Oceans; Phil. Trans. 155. 1, 



p. 408, t. 15, fig. 33. 

 PARK, et JONES, BRADY, 1866, Crag. For.; Pal. Soc. 19, p. 3, t. 3, figg. 



5254. 

 Operculina involvens Rss., 1849, Neue For. Wien. Beck.; Wien. Ak. Dkschr. 1. i, p. 370, t. 46, 



fig. 20. 

 Cornuspira involvens Rss., 1863, Sept. Thon. Offenbach; Wien. Ak. Sitz.-Ber. 1. 48, p. 39, t. 1, 



fig. 2. 



HKEN., 1875, Clav. Szab. Sch. p. 19, t. 1, fig. 2. 



oligogyra HKEN., ibid. p. 20, t. 1, fig. 10. 



tenuissima SCHWAG., 1863, Jnrass. Sch.; Wiirtemb. Nat. Verein. .Ihrhft. 21, p. 94, t. 2, 



fig. 5. 

 ? pachygyra GUMB., 1869, Cassian u. Raibl. Schicht.; Osterr. geol. Reichsanst. Jhrb. 19, 



p. 178, t. 5, figg. 9-10. 

 Operculina angigyra Rss., 1849, Neue for. osterr. tert. Beckon; Wien. Ak. Dkschr. 1. 1, p. 370, 



t. 46, fig. 19. 

 Cornuspira polygyra Rss., 1863, Sept. Thon Offenbach; Wien. Ak. Sitz.-Ber. 1. 48, p. 39, t. 1, 



fig. 1. 



HKEN., ibid. p. 19, t. 1, fig. 11; t. 2, fig. 1. 



nummulitica GUMB., 1868, Nordalp. Eociin.; K. Bayr. Ak. Wiss. Abh. 1. 10. 2, p. 604, 



t. 1, fig. 5. 



Archimedis, elliptica STACHE, 1865, Tert. Mergel Whaingar. Hafen; Novara Reise, geol. 



Th. 1. 2, p. 180181, t. 22, figg. 12. 



