NONIONINA BOUEANA. 



343 



NoNiONiNA SCAPHA, Terrigj, 1889. Mem. E. Accad. Lincei, ser , 4 vol. vi, p. 120 

 • ■ pi. X, fig. 7. 



— — Idem, 1891. Mem. Descriz. Carta G-eol., E. Com. Geo!. 



Ital., vol. iv, p. 110, pi. iv, fig. 18. 

 ■ — — logger, 1893. Abhandl. k. Bayer. Akad. Wiss., vol. xviii- 



p. 424, pi. xix, figs. 42, 43 (elongate). 



— coMMtiNis, Idem, 1893. Ibid., figs. 40, 41. 



— SCAPHA, Ooes, 1894. K. Svensk. Vet.-Akad. Handl., vol. xxv. No. 9, 



p. 104, pi. xvii, fig. 830. 



— — Woodward and Thomas, 1895. Final Eeport Geol. Nat. Hist. 



Survey Minnesota, vol. iii, pt. 1, 

 pp. 48—52, pi. E, figs. 35, 36. 



— COMMUNIS, ^yyer, 1895. Jahresb. xvi, Naturh. Yereins Passau, p. 40, 



pi. iii, fig. 17. 



— SCAPHA, Ooes, 1896. Bull. Mus. C. Z. Harvard Coll., vol. xxix, p. 79. 



Characters, — Shell oblong-ovate, depressed at the umbilicus; margin obtuse, 

 rounded ; chambers numerous arcuate, more or less ventricose ; aperture 

 crescentic on the inner margin of the terminal chamber. 



By the larger growth of the later chambers, the septal face of the last 

 segment varies from oval to more or less cordate, as in the thick variety named 

 N, Labradorica by Dawson. 



Occurrence. — Nonionina scapha is widely diffused. It is frequent in dredgings 

 from 30 to 100 fathoms, and has been taken at various depths down to 1421 

 fathoms. Taking the records of the 'Challenger' and the 'Gazelle' together, 

 it has been found in nearly every sea. 



Its geological range extends to the Neocomian (Bargate Beds) of Surrey, but 

 we are aware of no record in subsequent deposits until the Middle Tertiary is 

 reached. Specimens have been obtained from the Miocene of Italy, Malaga, and 

 Vienna ; from the Pliocene of Italy, Antwerp, and St. Erth ; and from several 

 Pleistocene deposits. In the Coralline Crag it occurs in every zone examined, 

 and it was recorded in the First Part of the Monograph as rare from the 

 Red Crag. 



2. Nonionina Boueana, d'Orbignij, 1846; var. Janiformis, nov. J. Woodcuts 



figs. 28 a, b, c. 



Synonyms of the typical form : 



Nonionina Botjeana, d'Orb., 1846. Poram. Foss. Vien., p. 108, pi. v, figs. 



11, 12. 

 — — Fictet, 1857. Traite Paleont., 2nd edit., vol. iv, p. 498, 



pi. cix, fig. 17. 



UJ L I B t' A R Y j :x 



- 'On 



