NONIONINA. 



339 



Mr. Millett's Systematic Grouping of the published figures of the Genus 



NONIONINA. 







11 



Si . 



i-< h o 

 02 



Umbilical region exposed on both faces. 



Nonionina Sloanii, d'Orb., 1839. Woodcut, 

 fig. 26, p. 341. 



— Grateloupi, d'Orb., 1S39. 

 - — communis, d'Orb., 1846. 



— — Terquem, 1882. 



— — — 1875. 



— — Egger, 1893. 



— exponens, B., P., and J., 1888. 



— Brotvnii, d'Orb., 1839. 



— communis, Terrigi, 1880. 

 crassula, var. scapha, Goes, 1882. 



— scapha, Egger, 1893. 



— communis, Terrigi, 1883. 



— punctulata, d'Orb., 1839. 



— aster izans, var. turgida,^ "William- 



son. 1858. 

 Polystomella crispa, var. Nonionina tur- 



gida, P. aud J., 1865. 

 Hotalia cristellarioides, Reuss, 1863. 

 Nonionina ttirgida, Goes, 1882. 



— — Brady, 1884. 



— — Terquem. 1886. 



— — Egger, 1893. 

 Nautilus faba,^ F. and M., 1803. 



— scapha, F. and M., 1803. Woodcut, 



fig. 27, p. 341. 

 Nonionina scapha, Brady, 1865. 



— — Terrigi, 1883. 



— Labradorica, Dawson, 1860. | 



— — Jones, Parker, and 



Brady, 1866. 

 Polystomella crispa, var. Nonionina scapha} 



P. aud J., 1865. 

 Nonionina pauper, Egger, 1857. 



— faba, Terrigi, 1883. 



— latescens, Schwager, 1883. 



— Boueana, Keuss, 1863. 



Umbilical region on both faces covered by 

 exogenous or other shell-deposit.^ 



Nonionina scapha, B., P., and J., 1888 

 (pi. xliii, figs. 20 6, c). 



Nonionina communis, Terrigi, 1883. 



— — Egger, 1857 (pi. xiv, 

 figs. 11, 12). 



— pauperata, Halkyard, 1889. 



— nautiloidea, Costa, 1856 (pi. xx, 

 fig. 1). 



— — Costa, 1856 (pi. xxii, 

 fig. 20). 



— pauperata, Balkwill and Wright, 

 1885). 



g Having the tivo characters combined, one umbilicus being open and the 



g other covered up. 



p Nonionina Boueana, var. Janiformis (see p. 343). 



w Nautilus spiralis-umbilicatus, &c., Walker and Jacob, 1784, ' Ann. Mag. Nat. Hist.,' 



^ ser. 3, vol. iv, 1859, p. 339, H a. 



1 Such as the asterigerine flaps over the sutures of Nonionina stelligera, and even supplementary 

 chambers if they be found to exist in any of the Nonioninse. 



^ N. turgida is one of the most characteristic, but not the central type of the N. communis group. 



' N. faba may be a Polystomella, but it has the elongate contour of N. scapha, and no published 

 Polystomella possesses this form. It is noted in the 'Ann. Mag. Nat. Hist.,' ser. 3, vol. v, 1860, p. 103, 

 that " this may be an oblong form " of P. striatopunctata. 



44 



