NONIONINA DEPRESSULA. 347 



(fig. 32), and was probably from the Coralline Crag of Sutton (?). It is in Mr. 

 F. Chapman's Collection. 



4. Nonionina depressdla (Walker and Jacob), 1798. Plate II, figs. 36, 37 ; Thick 



Variety. 



Part I, Appendix I, No. 98 (N. scapha) ; II, No. 99 (N. scapha). 



Synonyms of the Type : 



Nautilus spiralis utrinque subuuibilicatus, geniculis depressis plurimis, Walker and 



Jacob, 1784. Test. Min., p. 19, pi. iii.fig. 68. 

 Nautilus depeessulus, Walker and Jacob, 1798. Adams's Essays, Kanmacher's 



edition, p. 641, pi. xiv, fig. 33. 

 Nonionina depeessula, Parker and Jones, 1859. Ann. Mag. Nat. Hist., ser. 3, 



vol. iv, pp. 339 and 341. 



— asteeizans, var. depeessula, P. and J, 1862. Carpenter's Introd. 



Foram., Appendix, p. 310. 



— scapha, J, P., and B., 1864. Monogr. Foram. Crag, Appendix i, 



No. 98 ; ii, No. 99, pi. ii, figs. 36 and 37 



(thick form). 

 Poljstomella ceispa, var. (Nonionina) depeessula, P. and J., 1865. Phil. 



Trans., vol. civ, p. 403, pi. xiv, figs. 39 a, b. 

 Nonionina depeessula, Anon., 1870. Science Gossip, p. 12, fig. 29. 



— — Terrigi, 1880. Atti Ace. Pont. Nuov. Lincei, vol. xxxiii, 



p. 218 ; vol. iv, fig. 77. 

 Brady, 1884. 'Challenger' Report, p. 725, pi. cix, 

 figs. 6, 7. 



— B., P., and J., 1888. Trans. Zool. Soc, vol. xii, p. 229, 



pi. xliii, fig. 25. 



— — Terrigi, 1889. Mem. E. Accad. Lincei, ser. 4, vol. vi, 



p. 119, pi. x, fig. 4. 



— Egger, 1893. Abhand. k. Bayer. Akad. Wiss., vol. xviii, 



p. 427, pi. xix, figs. 38, 39. 



— Goes, 1894. K. Svensk. Vet.-Selsk. Akad. Handl., vol. 



xxv, p. 104, pi. xvii, figs. 825, 826. 



Some closely allied forms are enumerated by H. B. Brady in the ' Challenger ' 

 Report, page 725; and by F. W. Millett in the Table at p. 341. 



Characters. — Usually compressed ; periphery nearly circular, and somewhat 

 lobulate by the inflation of the chambers ; sutures depressed ; septal face more or 

 less rounded. 



The variety figured in PI. II, figs. 36, 37, is an extraordinarily thick form ; 

 the latest chambers having widened out crosswise, until the face of the last 

 chamber is transversely reniform, instead of being suboval and compressed. 



45 



