FORAMINIFERA OF THE WEST OF SCOTLAND. 



281 



6 Stations. 



Extremely rare, only an occasional small specimen at the Stns. where it occurs— all 

 of them of the compressed elongated type represented by N. sloanii, d'Orbigny (d'O. 

 1839, FC. p. 46, pi. vi. figs. 18 & 18 bis). 



315. Nonionina turgida (Williamson). 



Rotalina turgida, Williamson, 1858, RFGB. p. 50, pi. iv. figs. 95-9". 



Nonionina turgida, Brady, 1884, FC. p. 731, pi. cix. figs. 17-19. 

 20 Stations. 



Almost universally distributed with practically no variation, except in the degree of 

 turgidity of the overlapping chambers. 



316. Nonionina pauperata, Balkwill & Wright. 



Nonionina pauperata, Balkwill & Wright, 1885, DIS. p. 353, pi. xiii. figs. 25, 26. 



Heron-Allen & Earland, 1908, etc., SB. 1911, p. 342, pi. xi. figs. 16, 17. 

 12 Stations. 



Widely distributed, but always rare. All the specimens are rather small, the best 

 being found at Stns. 4 and 25. 



Polystomella, Lamarck. 



317. Polystomella faba (Fichtel & Moll). (Plate 43. figs. 11-19.) (New to 



Britain.) 



Nautilus faba, Fichtel & Moll, 1798, TM. p. 103, pi. xix. figs. a-c. 



Polystomella faba, Parker & Jones, 1859, etc., NF. 1860, vol. v. pp. 102, 103, & vol. vi. p. 139. 



„ Jones, Parker, & Brady, 1866, etc., MFC. p. 349 (woodcut). 



„ Fornasini, 1899, PF1. p. 647. 



9 Stations. 



Piclitel and Moll's description indicates a pauperate form intermediate between 

 Nonionina and 'Polystomella, but referable to the latter genus on account of its retral 

 processes. Their figure, however (of which we possess Moll's original water-colour 

 drawing), gives no indication of the Polystomelline affinities, such as are plainly referred 

 to in their text, and are shown in Parker and Jones's woodcut [lit supra), which is repro- 

 duced from their previous work (P. & J. 1865, NAAF. p. 402, pi. xiv. fig. 36). Two 

 distinctive types occur in these dredgings, both of which, we think, should be placed 

 under Fichtel and Moll's species, although differing in certain respects. The first or 

 compressed type, which is nearest to P. faba, has somewhat inflated chambers of an 

 involute type, six or seven visible in the final convolutions ; sutural lines curving and 

 strongly depressed, filled with fine granular matter radiating from the umbilicus down 

 the sutures, and giving a stellate appearance to the test, owing to the whitish granu- 

 lations contrasting strongly with the hyaline surface of the chambers. It closely 

 resembles Nonionina stelligera superficially, and is probably responsible for many 

 British records of that species, as it is widely distributed round the British coast, 

 whereas true N. stelligera is rare. The retral processes, which are few in number, are 



