264 FORAMINIFERA OF THE CRAG. 



Characters. — Shell elongate, fusiform, more or less compressed ; acuminate or 

 subacuminate at the ends. Chambers elongate, in two parallel series, with 

 slightly depressed sutures. 



Occurrence. — Polymorphina cylindroides is not recorded in the ' Challenger ' 

 Report, nor in Egger's report on the voyage of the ' Gazelle.' It has been 

 dredged off Skye by Mr. Barlee ; also in some other northern localities. 



The type-specimens were obtained by Count Miinster from the Newer 

 Tertiaries of North Germany. It has been figured by von Schlicht from the 

 Oligocene of Pietzpuhl. 



In the Crag we have specimens from Broom Hill, zone e, and Gedgrave, 

 zone f. 



9. PoLYMOEPHiNA cONCAVA, WUUamson, 1857. Plate V, fig. 22. 



PoLTMOEPHiNA lACTEA, var. CONCATA, Williamson, 1857. Eec. Foram. Great 



Britain, p. 72, pi. vi, figs. 151, 152. 



— CONCAVA, Brady, FarTcer, and Jones, 1870. Trans. Linn. Soc, 



vol. xxvii, p. 236, pi. si, fig. 22. 



— — Brady and Bohertson, 1875. Report Brit. Assoc, for 



1874, p. 190. 



— — Siddall, 1878. Proc. Chester Soc. Nat. Sci., No. 2, p. 54. 



— — Millett, 1885. Eep. and Trans. Penzance Nat. Hist. 



and Antiq. Soc, p. 28. 



— — Brady, 1887. Journ. Eoy. Microsc. Soc, p. 914. 



— — RalhyardjlSSQ. Eep. Manchester Microsc. Soc, p. 68. 



Characters. — Shell oval or oblong, concave or flat on one face, somewhat 

 convex on the other ; chambers like those of P. lactea or P. gibba, bordered by a 

 broad, irregular, thin flange ; parasitical. 



Occurrence. — Polymorphina concava is very rare in the recent condition. 

 Williamson's specimens were obtained from Brixham, and we are not aware that 

 it has been met with elsewhere than off our own coasts. A fossil specimen has 

 been found in the Neocomian (Bargate beds) of Surrey. It has not been recorded 

 from any of the Tertiary formations older than the Pliocene. Mr. Millett has 

 found it in the St. Erth beds ; and we have it from the Casterlian of the Katten- 

 dyke Docks, Antwerp. Mr. Millett has it from the Post-glacial beds of March, 

 Cambridgeshire, and from the 'Challenger' dredgings of Station 185, Raine 

 Island, at 155 fathoms. The figured specimen is from the Coralline Crag at 

 Gomer ; we have specimens from Gedgrave, zone f. 



