KONGL. SV. VET. AKADEMIENS HANDLINGAR. BAND. 19. N:0 4. 141 



Syn. Lituola nautiloides d'Orb., 1839, For. Craie bl. Pai-is; Mém. Soc. geol. France 4, p. 29, t. 2, 



figg. 28—31. 

 » » d'Okb., 1846, For- Bas. tert. Vienne p. 138, t, 21, ligg. 20—21. 



» » Rss., 1859, Westphäl. Kreide; Wien. Ak. Sitz.-Ber. 40, p. 220, t. 10, figg. 



5—8. 

 » nautiloidea Brady, 1876, Carbonif. aud Perm. For.; Paliieoutogr. Soc. 30, p. 63, t. 8, 



fig. 7. 

 » » Cakpent., Introduot. t. 6, fig. 44. 



Lituolina irregnlaris var. compressa n. 



Tab. XII, figg. 421—423. 



This form seems nearly identical with Haplophragmium acutidorsatum Hantken 

 from the Clavulina Szäboi strata in Hungary. 



Compressed forms of Lituolinte have seldom come under notice, but this sur- 

 passes in fiatness all sucli described forms being probably a står ved variety of the tj^pe. 

 It is on both sides somewhat umbilicated; soraewhafc rough or scrobiculate, and ap- 

 pears as if felted together of siliceous needles and a smaller quantity of grains of 

 sand, whence the surface presents a sericeo-tomentous aspect. The septal lines are 

 very indistinct. The adult shows a tendency to become lituiform, the aperture being 

 placed near the top of the last chamber, otherwise it has its ordinary Nonioninoid 

 shape and place. Since the principal constituents of the shell are hyaline and coloiir- 

 less in themselves, it is evident that its rust-colour is not derived from any materials 

 with colour of their own but from the partly precipitated and partly secreted, coloured 

 cementing matter. 



Raphidohelix elegans Möb., Mauritius p. 76, t. 2, fig. 2 seems to belong to this 

 variety; perhaps also Haploijhragmium foliaceum Brady, Qu. J. Micr. Se. (N. S.) 81, 

 p. 50. 



It is scantily met with in the coralline-gravel. 



Fig. 421 : sideview. 



Fig. 422: edgeview. 



Fig. 423 : Thin section showing the texture of the test and the faintly marked 

 septa. 



Lituolina irregnlaris var. globigeriiiaeformis Park. and Jones. 



Tab. XII, figg. 424—425. 



Notwithstanding the suggestive assumption advanced by some most able and ex- 

 perienced investigators as to the true Giohigerine nature of this form, its arrangement 

 of chambers and apertures being so characteristic »as to leave no room for doubt that 

 these forms are true Globigerinse and not Lituola^» (G. C. Wallich, M. D., Deep-sea- 

 researches on the biology of Globigerina, Lond. 1876, p. 63), and although there is 

 occasionally associated with it a nautiloid form with globular chambers exactly in con- 



