716 ME. F. CHAPMAN ON THE BAEGATE BEDS OF SXJEEEY. [Nov. 1 894, 



101. Polymoephina communis, d'Orbigny. 



P. (Guttulina) communis, d'Orbigny, Ann. Sci. Nat. vol. vii. 

 (1826) p. 226, no. 15, pi. xii. figs. 1-4 : Modele no. 62. 



This shallow-water form is represented here by one specimen 

 from the Pebble-beds, Littleton. 



102. Polymoephina compeessa, d'Orbigny. 



P. compressa, d'Orbigny, ' Poram. Poss. Vienne,' 1846, p. 243, 

 pi. xii. figs. 32-34. 



This species is also a shallow-water form, and makes its earliest 

 appearance as a fossil in the Lias of Prance and England. 



Two specimens from the Pebble-beds, Littleton. 



103. Polymoephina oblonga, Williamson. 



P. lactea, var. oblonga, Williamson, ' Rec. Por. Gr. Brit.' 1858 r 

 p. 71, pi. vi. figs. 149, 149 a. 



This species is easily distinguished from P. angusta, Egger, 1 by 

 its compressed outline in transverse section. The Bargate speci- 

 mens resemble P. angusta in the paucity of the chambers and the 

 well-marked segmentation ; but, since their whole test is com- 

 pressed, they more properly belong to Williamson's species. This 

 is, moreover, the first recorded occurrence of the species as a fossil. 



Two specimens from the Pebble-beds, Littleton. 



104. POLYMOEPHINA EHABDOGONIOIDES, Sp. n0V. (PI. XXXIV. 



fig. 12 a, b.) 



Test subpyramidal and quadrifacial ; bluntly pointed at the base 

 and rapidly increasing in width towards the oral extremity. The 

 test is smooth, and consists of a Polymorphine series of chambers 

 (slightly twisted as regards the commencement), the margins of 

 which are deeply sunken, and the chambers themselves, numbering 

 about five to seven on each face of the test, well inflated, especially 

 in the case of the more or less central one visible on each face. 

 The terminal chamber is large and embracing, subquadrangular in 

 section, but not regular. The aperture is circular, and with the 

 margin pectinate. Length -^ inch (0 - 36 mm.) ; width diagonally 

 -jJ-g- inch (0-23 mm.). 



The foregoing species is probably a dimorphous form, combining 

 Polymorpliina with Khabdogonium, and, in the event of other 

 varieties becoming known, it may be found necessary to form a 

 distinct genus for this type. 



Two specimens from the Pebble-beds, Littleton. 



105. POLYMOEPHINA FEONDICULAEIOIDES, Sp. nOV. (PI. XXXIV. 



fig. 13 a, b.) 



Test subpyriform, but somewhat compressed, tapering more 

 acutely towards the aboral extremity ; test rhomboidal in section. 

 Surface smooth, and swollen along the centre of each face. About 



1 Neues Jahrb. 1857, p. 290, pi. xiii. figs. 13-15. 



