268 Messrs. Parker and Jones on 



edit. 1867, p. 356; Bigsby's ^ Thesaurus Siluricus,' 1868, 

 p. 6; and^Monogr. Folymorph.^'"Sl\d.\\&. Lin. Soc. vol. xxvii. 

 p. 199. 



11. " On further important microscopic organic forms from 

 the oldest Silmnan clay near St. Petersburg.'''' With a plate. 

 (Monatsber. 1858, pp. 328 &c., pi. i.) 



A (p. 306). White marl-casts or marl-morpholites. 1. 

 Miliolina ?, and 2. Textilarina ? 

 B. Green siliceous internal casts. 



3. Vaginulina?, in pi. I. fig. i. 



4 (p. 307). Nodosaria?, fig. ii. 



5. Textilaria? imitatrix, fig. ill. 



6. Polymorphina abavia, fig. IV. 



7. P. avia, fig. v. 



8 (p. 308). Guttulina silurica, fig. VI. 



9. Rotalia palseotrias. l Figs. vii. & viii. No. 9 is omitted 

 10. R. palseotetras. j in the later list. 



11 (p. 309). R.? palgeoceros. (" Like R. Hemprichii,'' 'Mi- 

 krog.' pi. xxxiv. f. 62.) Fig. ix. 



12. Dexiospira triarchgea, fig. x. 



13. D. hexarchcea, fig. xi., a, h. 



14 (p. 310). Aristerospira octarchsea, fig. xii. 



15. Nonionina? archetypus, fig. xiii. 



16. Spirocerium priscum. (" New genus near Spirohotrys^ 

 but has not the two openings in the later chambers.") 

 Fig. XIV. 



These figured glauconitic grains are magnified 56 diam. 

 Their relationship to Foraminifera is very uncertain. They 

 are not nearly so clear and definite as the usual inner moulds 

 of foraminiferal shells ; but, like the green grains in our Upper 

 and Lower Greensand, some may be such casts, and many are 

 probably of concretionary or derivative origin. As Dr. Ehren- 

 berg at first stated, little can be said of them except that they 

 have Rotaline and Textilarian appearances. Some may have 

 belonged to Eozoon (as fig. i.). Figs, iv., v., VI. look Buli- 

 mine; Vii., Viii., x. look Globigerine; ix. somewhat Nonio- 

 nine ; xi., xii., more or less Rotaline. They are all doubtful. 

 C (p. 311). "Calcareous shale casts from the Devonian 

 strata near St. Petersburg.*' 



17- Miliola (Holococcus) Panderi. (" Trochiliscus ^ Pander: 

 orbicular or oval ; hollow ; compressed in the middle or 

 on the side ; with a single opening ; furrowed longitu- 

 dinally with 18-20 sulci, which in some cases are 

 spiraL") =iyaye?^a? 



