108 Messrs. W. K. Parker and T. R. Jones on the 



Nummulite, 2 lines in diameter. The section, fig. g, shows 

 three whorls and a large central chamber; eighteen chambers 

 in the outer whorl. The chambers, as to their relative size and 

 setting-on, are like those of N. Mamilla. 



By MM. d'Archiac and Haime N. lenticularis, var. a, is 

 recognized as a species, and renamed N. Tchihatchejfi, Monogr. 

 p. 98, pi. 1 . fig. 9. 



Var. /J, pi. 7. figs, a, b. A small lenticular Nummulite, 

 2 lines in diameter, covered with closely-set granules ; on the 

 figure about thirteen granules lie in a row along the diameter of 

 the shell. 



According to MM. d'Archiac and Haime, this is N. Lucasana, 

 Defr., var. , Monogr. p. 125, pi. 7. fig. 7. 



Var. 7, pi. 7. figs. c-f. A small, smooth, lenticular Nummulite 

 (3J lines in diameter), more convex on one face than on the 

 other. In the section, fig. e, 6| whorls are seen, with the central 

 cell large, and thirty-six chambers in the outer whorl (thirty- 

 two on the fifth, and about the same number in the third whorl); 

 chambers very like those of N. Mamilla and N. lenticularis, var. a, 

 but more numerous. 



MM. d'Archiac and Haime refer this to N. Molli, d'Arch., 

 Monogr. p. 102, pi. 4. fig. 13. 



Var. S, pi. 7. fig. g. A small lenticular Nummulite, 3| lines 

 in diameter, marked with twenty-four more or less curved or 

 sinuous striae, radiating from the periphery towards the centre 

 of the face, but leaving a small clear umbonal area. 



M. D'Orbigny collates this variety as identical with his 

 N. radiata, For. Foss. Vien. p. 115; but we cannot coincide in 

 this determination, though these varieties may belong to one 

 species. According to MM. d'Archiac and Haime, this is N. 

 Biaritzensis, d'Archiac, Monogr. p. 131, pi. 8. figs. 4-6. 



Var. , pi. 7. fig. h. A small lenticular Nummulite, 3| lines 

 in diameter, resembling var. S, excepting that the interspaces 

 between the radial lines are occupied with granules, mostly in 

 single rows of from 4 to 7, but sometimes in double series 

 towards the periphery. 



This is N. perforata (Montf.), D'Orb., and accepted under 

 that name by MM. d'Archiac and Haime, Monogr. p. 115, pi. 6. 

 figs. 1-12. 



These figures of five varieties of Nummulites, though boldly 

 drawn and apparently with care, give us but little exact evidence 

 of the real relationships of the originals. We have quoted the 

 determinations arrived at by MM. d'Archiac and Haime, after 

 considerable research ; but, even with the aid of their pains- 

 taking and minute descriptions and their numerous and faithful 

 drawings, we cannot readily follow them to their conclusions. 



