REPORT OH THE FORAMIHIFERA. 
733 
umbonate forms and those in which the umbilical depressions are filled with clear shell- 
substance, that portion of the test is traversed by straight vertical canals. The openings 
of the canals, excepting those of the umbilical region last referred to, are seldom 
conspicuous on the exterior. They exist, however, in the form of single or double rows 
of pores upon the septal lines, and are best seen in the smooth-shelled species, like 
Polystomella arctica (PI. CX. figs. 2-5). 
The distribution of the genus Polystomella, whether geographical or geological, corre- 
sponds closely with that of Nonionina ; but though the feebler varieties are occasionally 
met with in deep water, it belongs essentially to a shallower zone of the ocean. It also 
appears to reach back to an earlier geological period, having recently been found by 
Dr. Uhlig in formations of Middle Jurassic age. 
Polystomella striatopunctata, Fichtel and Moll, sp. (PI. CIX. figs. 22, 23). 
Nautilus striatopundatus, Fichtel and Moll, 1803, Test. Micr., p. 61, pi. ix. figs. a-c. 
Polystomella poeyana, d’Orbigny, 1839, Foram. Cuba, p. 75, pi. vi. figs. 25, 26. 
„ articulata, Id. 1839, Foram. Amer. Merid., p. 30, pi. iii. figs. 9, 10. 
Geoponus stella-borealis, Ehrenberg, 1839, Abbandl. d. k. Akad. Wiss. Berlin, p. 132, pi. i. 
figs. a-g. 
Polystomella hauerina 
, d’Orbigny, 1846, For. Foss. Yien., p. 122, pi. vi. figs. 1, 2. 
33 
rugosa, 
Id. 
Ibid. 
p. 123, pi. vi. figs. 3, 4. 
39 
obtusa, 
Id. 
Ibid. 
p. 123, pi. vi. figs. 5, 6. 
33 
antonina. 
, Id. 
Ibid. 
p. 128, pi. vi. figs. 17, 18. 
33 
listen, 
Id. 
Ibid. 
p. 128, pi. vi. figs. 19-22. 
33 
stella-borealis, Schultze, 1854, Organ. Poly thal., p. 67, pi. vi. figs. 5, 6. 
93 
gibba, 
Id. 
Ibid. 
p. 66, pi. vi. figs. 1-4. 
33 
venusta, 
Id. 
Ibid. 
p. 67, pi. vi. figs. 7-9. 
Nonionina heteropora, Egger, 1857, Heues Jabrb. fur Min., &c., p. 300, pi. xiv. figs. 19-21. 
,, dense-pundata, Id. Ibid. p. 299, pi. xiv. figs. 22, 23. 
Polystomella subcarinata, Id. Ibid. p. 301, pi. xiv. figs. 24, 25. 
„ angulata, Id. Ibid. p. 302, pi. xv. figs. 5, 6. 
,, umbilicatula, Williamson, 1858, Rec. For. Gt. Br., p. 42, pi. iii. figs. 81, 82. 
„ „ var. incerta, Id. Ibid. p. 44, pi. iii. fig. 82, a. 
,, inflata, Reuss, 1860, Sitzungsb. d. k. Ak. Wiss. W r ien, vol. xlii. p. 358, pi. i. 
fig. 10, a.b. 
„ striatopunctata, Parker and Jones, 1860, Ann. and Mag. Hat. Hist., ser. 3, vol. v. 
p. 103, Ho. 6. 
,, minuta, Reuss, 1864, Sitzungsb. d. k. Ak. Wiss. Wien, vol. 1. p. 478, pi. iv. fig. 6, a.b. 
„ discrepans, Id. Ibid. p. 478, pi. iv. fig. 7, a.b. 
„ latidorsata, Id., 1864, Denkscbr. d. k. Akad. Wiss. Wien, vol. xxiii. p. 10, pi. i. 
fig. 16, a.b. 
„ crispa, var. striatopunctata, Parker and Jones, 1865, Phil. Trans., vol. civ. p. 402, 
pi. xiv. figs. 31-34; pi. xvii. fig. 60, a.b. 
„ excavata, Terquem, 1875, Annn. sur la Plage de Dunkerque, p. 25, pi. ii. 
fig. 2, «-/. 
,, umbilicatida, Id. Ibid. p. 25, pi. ii. fig. 3, a.b. 
(ZOOL. CHALL. EXP. — PART XXII. — 1884.) Y 93 
