Vol. 50.] MK. E. CHAPMAN ON THE BAEGATE BEDS OF STJEREY. 717 



six chambers are visible on each surface, slightly inflated, and 

 bordered by well-marked sutures. The last chamber is pinched up 

 towards the apex ; but it embraces the whole width of the test, 

 alter the manner of Frondicularia and Lingulina. Aperture slightly 

 elongate, with a stellate border. Length -gL- inch (037 mm.) ; width. 

 Y^j inch (0-19 mm.). 



This form also appears to represent a uew genus or subgenus, 

 combining two hitherto distinct generic types. 



One specimen from the Pebble-beds, Littleton. 



106. Polymorphina begina, Brady, Parker, & Jones. 



P. regina, B., P., & J., Trans. Linn. Soc. Lond. vol. xxvii. (1870) 

 p. 241, pi. xli. figs. 32 a, b. 



A somewhat imperfect specimen and having a compressed test, 

 but otherwise referable to this species, was found in the Bargate 

 Beds, Holloway Hill. 



107. Polymoephina concava, "Williamson, var. dentimaeginata, nov. 

 (PI. XXXIV. fig. 14 a, 6.) 



Test adherent, flat on the attached and convex on the opposite 

 face. Subovate in outline, and sharply pointed at both ends. On 

 the upper and lower surfaces, in the central area of the test, is 

 exhibited a regular Polymorphine series, consisting of five chambers 

 on the upper surface, and surrounding this is a secondary or later 

 growth of shell-material, depauperate and thin, which appears to 

 turn back upon the under surface, forming the adherent portion. 

 The thin, outer, flange-like portion of the test shows the septation of 

 five flattened segments. The delicate margin of the test is broken 

 up into a fine pectinate edge ; and, by careful observation, the sur- 

 face is seen to be studded sparsely with minute prickles. Length 

 -gL- inch (0*65 mm.) ; width -Jg- inch (0*3 mm.). 



The type form P. concava * has the attached or lower surface 

 concave, and the margin of the test entire or simply waved ; the 

 lower surface would of course be conformable in shape to the object 

 upon which it grew, so that concavity of surface is no true distinctive 

 character in this species. 



One specimen from the Pebble-beds, Littleton. 



Subfamily Eamuiininx 

 Ramulina, Jones. 



108. Eajiulina globulifeea, Brady. 



R. globulifera, Brady, Quart. Journ. Micr. Sci. n. s. vol. xix. 

 (1869) p. 58, pi. viii. figs. 32, 33; id. 'Challenger' Eep. vol. is. 

 (1884) p. 587, pi. lxxvi. figs. 22-28. 



It appears desirable to associate the smooth or prickly, tubular- 

 and sometimes globular-chambered Bamulince of Cretaceous strata 



1 Polymorphina lactea, var. concava, Williamson, ' Kec. For. Gr. Brit.' 1858, 

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



