FORAMINIFERA OP THE NORTH PACIFIC OCEAN. 



9 



This genus, represented among the fossils by large, striking and 

 often complicated tests, is, in recent species, represented by small, 

 rather simply constructed tests. In the fossil forms there is usually 

 a central core of deposited material about which are the chambers 

 themselves. 



This is evidently a genus which is surviving only by its simplest 

 species, the more complex forms having become extinct in past 

 geological periods. 



PATELLINA CORRUGATA Williamson. 



Plate 7, fig. 1. 



Patellina corrugata Williamson, Rec. Foram. Great Britain, 1858, p. 46, pi. 3, 

 figs. 86-89.— Carpenter, Parker, and Jones, Introd. Foram., 1862, p. 229, 



Fig. 8.— Patellina corrugata Williamson. (Adapted from Williamson's original figures.) 

 a, dorsal view; 6, side view; c, ventral view. 



pi. 13, figs. 16, 17, text-figs. 37, 38. — Parker and Jones, Philos. Trans., 

 vol. 155, 1865, p. 398, pi. 15, figs. 29a-c. — Schwager, Boll. Com. geol. Ital., 

 vol. 8, 1887, p. 26, pi., fig. 58. — Butschli, in Bronn, Klassen und Ordnungen 

 Thier-Reichs, 1880, p. 208, pi. 9, fig. 9.— H. B. Brady, Rep. Voy. Challenger, 

 Zoology, vol. 9, 1884, p. 634, pi. 86, figs. 1-7.— Egger, Abh. k6n. bay. Akad. 

 Wiss. Munchen, CI. n, vol. 18, 1893, p. 393, pi. 15, figs. 70-72.— Goes, Kongl. 

 Svensk. Vet. Akad. Handl., vol. 25, No. 9, 1894, p. 92.— Schaudinn, Sitz. 

 Ges. Nat. Freunde zu Berlin, No. 19, 1895, p. 181, text-fig. — Schlumberger, 

 Feuille Jeunes Nat., ser. 3, ann. 26, 1896, p. 129, text-fig.— Wright, Geol. 

 Mag., ser. 4, vol. 7, 1900, p. 100, pi. 5, fig. 20. — Millett, Journ. Roy. Micr. 

 Soc, 1903, p. 696.— Rhumbler, Zool. Jahrb., Abth. Syst., vol. 24, 1906, 

 p. 35. — Chapman, Journ. Quekett Micr. Club, ser. 2, vol. 10, 1907, p. 131, 

 pi. 10, fig. 7. — Sidebottom, Mem. and Proc. Manchester Lit. and Philos. 

 Soc, vol. 52, No. 13, 1908, p. 9.— Cushman, Proc. Boston Soc. Nat. Hist., 

 vol. 34, 1908, p. 29, pi. 5, fig. 3. — Sidebottom, Mem. and Proc. Manchester 

 Lit. and Philos. Soc, vol. 54, No. 16, 1910. — Chapman, Journ. Linn. Soc, 

 Zoology, vol. 30, 1910, p. 419. 



Description. — Test usually free, conical, or plano-convex; early 

 portion composed of chambers spirally arranged, later ones elon- 

 gating and finally becoming annular or nearly so in the last-formed 

 portion of the test; chambers partially divided by internal septge 



