io6 HALKYARD, Fossil Foraminifera of the Blue Marl 



SUB-FAMILY ROTALIN^. 



Genus Patellina, Williamson. 



263. Patellina corrugata, Williamson. 



Patellina corrugata, Williamson, 1858, Rec. Brit. Foram., p. 



46, pi. Ill, figs. 86-89. 

 P. corrugata, Brady, 1884, Chall. Rep., vol. IX, p. 634, pi. 

 LXXXVI, figs. 1-7. 



Very rare, small, and delicate. 



(The specimens although few in number are very remark- 

 able, for they include not merely the original type of William- 

 son, which is the sole representative of this species at G.3. but 

 also the peculiar flat discoid type now typical of Australian 

 shore-gatherings, which occurs in G. 8 and 9. This has been 

 figured by Chapman. (C. 1907. R.F.V. p. 134, pi. X, fig. 7.) ) 



264. [Chapmania gassinensis, Silvestri.] 



[Chapmania gassinensis , Silvestri, Atti. Pont. Ac. N. Lincei, 

 Ann. 4. viii. (1904-5), p. 130.] 



264A. Patellina conica, sp. nov. 

 PI. VI, fig. 7, and PI. VIII, figs. 6-7. 



Test conical with rounded apex, inferior face flat, peri- 

 pheral edge obtuse. External or cortical layer consisting of 

 numerous small chambers arranged at first in spiral whorls, 

 latterly in concentric rings. Hollow central portion of test 

 filled with perforated horizontal lamellae which are connected 

 with one another by short vertical columns. Diam. 1.1 mm. 

 Height, .9 mm. 



This new species is rare, and hitherto has only been found 

 in material collected from sandy and shelly veins in the beds 

 exposed between tide-marks at the end of the Quai des Basques. 

 The form is a well developed one and displays all the character- 

 istics of the genus, but instead of large chambers sub-divided 

 into chamberlets by transverse partitions, the cortical layer 

 consists of numerous small chambers of square or rectangular 

 section, and with a rounded apex which is pointed towards the 

 vertical axis of the test, and at right angles to it. In a fortui- 

 tously broken specimen I have observed the globular primor- 

 dial chamber which is followed by two arc-shaped ones, this 

 form gradually gives place to the "obelisk" form. The first 



