124 Transactions of the Society. 



Bulimina convoluta Williamson. 



Bulimina pi(2)oides, var. convoluta Williamson, 1858, Eec. Foram. Gt. 



Britain, p. 63, pi. v, figs. 132, 133. 

 B. convoluta IBrady, 1884, Chall. Eept., p. 409, pi. cxiii, fig. 6, 

 B. coilvohita Millett, 1898, etc., Foram. Malay Archipelago, Journ. Roy. 



Micr. Soc, 1900, p. 279, pi. ii, fig. 9. 



The specimens are small, but typical, and rather more erect than 

 is usual in this species. The secondary chambers are well de- 

 veloped. Frequent. 



Bulimina Willianisoniana Brady. 



BiUimina toilliamsoniana, 1884, Chall. Rept., p. 408, pi. li, figs. 16, 17. 



B. luilliamsoniana Millett, 1898, etc., Foram. Malay Archipelago, Journ. Roy. 



Micr. Soc, 1900, p. 279, pi. ii, fig. 8. 

 B. williamsoniana (Buliminoides) Cushman, 1910, etc., Foram. N. Pacific 



Ocean, 1911, U.S. Nat. Mus. Bull. 71, pt. ii, Textulariidie, p. 90, 



fig. 144. 



Two very short tests occur. 



Bulimina magdalidiforme (Schwager). (PI. Ill, figs. 12-15.) 



Ataxopliragmium magdalidiforme Schwager, 1866, Geol., ii, p. 194, 

 pi. iv, fig. 1, 



I was quite unable to decide to which genus the specimens 

 should be allocated, and therefore submitted examples and sections 

 to Mr. Earland, who is of opinion that they are the same as 

 Schwager's species. After reading a translation of Schwager's 

 description and remarks I am in agreement with Mr. Earland. 



Test rough, subcylindrical or ovate, superior end rounded off, 

 inferior end tapering to a blunt point. Colour, a light yellowish 

 grey. 



In the following remarks the quotations are from Mr. Earland's 

 letter to me: "The walls are built up of fine calcareous and 

 siliceous mud on a basis of calcareous cement." The sutural lines 

 do not show on the surface of the test owing to a " certain amount 

 of overlapping external shell deposit masking the sutural lines." 

 In the section the sutural lines can be seen between the later 

 chambers. The- aperture in fig. 12 differs from the type-form 

 (which is comma-shaped and erect), and is arched and liorizontal, 

 and situated as shown. In some of the tests it is more or less in- 

 definite and depressed. Nine occur. 



This is a very curious and abnormal form differing widely in 

 structure from any of the associated species of Bulimina. It does 

 not appear to have been recorded since its discovery by Schwager 

 in the Tertiary of the Nicobar Islands, and a further investigation of 

 its structure may necessitate its removal to a new genus. 



