352 FORAMINIFERA OF THE CRAG. 



PoLTSTOMELLA STEiATOPUNCTATA, Terrigi, 1880. Atti Accad. Pontif. N. Line, 



ann. xxxiii, p. 216, pi. iv, figs. 73, 

 74. 

 — • Antonina, Terquem, 1882. Mem. Soc. geol. France, ser. 3, vol. ii, 



p. 47, pi. ii (x), figs. 25 a, h. 



— STEIATOPUNCTATA, Jones, 1883. Microgr. Diet., ed. 4, p. 623, 



pi. xxiv, fig. 19. 



— — Bradi/, 1884. Eeport 'Challenger,' p. 733, 



pi. cix, figs. 22, 23. 



— CEISPA, J. W. Dawson, 1886. Handb. Zool., ed. 3, p. 45, fig. 37. 



— STEIATOPUNCTATA, Brady, 1887. Joiirn. Eoy. Micr. Soc, p. 926. 



— — Fornasini, 1887. Boll. Soc. G-eol. Ital., vol. v, 



p. 161. 



— — £., P., and J., 1888. Trans. Zool. Soc, vol. 



xii, part 7, p. 230, pi. xliii, fig. 17. 



— — -Effffer, 1893. Abh. k. Bayer. Ak. Wiss., vol. 



xviii, p. 433, pi. six, figs. 49, 50. 



— — (partim), Goes, 1894. K. Sven. Vet.-Ak. 



Handl., vol. xxv. No. 9, p. 101, 

 pi. xvii, figs. 815 c — I, 0, p, s, t, 

 817, 818, 819. 



— — Goes, 1896. Bull. Mus. C. Z. Harvard Coll., 



vol. xxix, p. 78. 



Characters. — Shell nautiloid, rather compressed, the outermost convolution 

 concealing the previous whorls ; segments numerous, arcuate, somewhat ventricose ; 

 margin rounded and more or less lobulated ; septal lines and umbilicus generally 

 depressed ; septal bridges (retral processes) well developed ; aperture variable. 



Polystomella striatopunctata differs from the type (P. crista) in the generally 

 smooth condition of the shell and its rounded margin. It is the principal 

 representative of the genus in brackish and shallow waters, under enfeebling 

 external conditions. It seldom attains any considerable size, and has often a very 

 thin and delicate shell. 



Occurrence. — This species is practically cosmopolitan, but its habitat is in 

 comparatively shallow water. It is most frequently met with at depths ranging 

 from the shore-line to 100 fathoms. It is, however, not unfrequently found at 

 depths down to 600 fathoms, and occasionally in still deeper water. 



Fossil specimens have been recorded from the Eocene (London Clay and 

 Calcaire Grossier) ; from the Oligocene of Germany ; from the Miocene of Vienna, 

 Bavaria, and Malaga ; from the Pliocene of Antwerp, Italy, and St. Erth ; and 

 from the Pleistocene generally. In the Coralline Crag we have somewhat rare 

 specimens from nearly every zone examined ; and it has been found, as stated in 

 the First Part of the Monograph, throughout the Upper Crag. 



