Manchester Memoirs, Vol. Ixii. (191 7) 71 



(The internal structure of this very interesting- little form 

 shows that it is not a Nodosaria but an Ellipsoidina and closely 

 allied to E. subnodosa, Guppy (G. 1884. F.T. p. 650, pi. XL1, 

 fig. 12). The aperture is also characteristic of that genus. All 

 the Biarritz specimens are regularly tapering and microspheric, 

 whereas in the Trinidad form the initial chamber is but slightly 

 smaller than its successors and the shell is nearly straight in- 

 stead of curved. It is possible that the two may represent 

 micro- and megalo-spheric forms of the same species but pen- 

 ding further investigation Halkyard's form must stand under 

 the name Ellipsoidina lorifera. 



The comparison with Dentalina lorneiana d'Orbigny does 

 not extend beyond external shape and curvature of the cham- 

 bers. D'Orbigny's figure exhibits a marked nodosarian aper- 

 ture and there is no suggestion of an internal siphon. 



The Lingulina rotundata d'Orb., referred to in the text is 

 on the other hand, from its characteristic orifice, evidently an 

 Ellipsoidina and probably closely allied to Guppy's form from 

 Trinidad.) 



151. Nodosaria (Dentalina) pauperata, d'Orbigny. 

 PI. IV, figs. 8, 9, 14, 15. 



Dentalina pauperata, d'Orbigny, 1846, Foram. Foss. Vienne, 

 p. 46, pi. I, figs. 57-58- 



Nodosaria pauperata, Brady, 1884, Chall. Rep., p. 500, wood- 

 cuts 14a, b, c. 



This species is common in our collections, and, as might 

 be expected, many deviations from the type can be noted. 

 Figure 9 represents a typical shell, and figure 8 one with elon- 

 gated segments and approaching in character Dentalina vetus- 

 tissima, d'Orb. In figures 14 and 15 we have two other modi- 

 fications with globular segments and sharp initial ends to the 

 shells, the latter figure resembles somewhat the form named 

 Dentalina chrysalis by Cornuel (Mem. Soc. Geol., France, 

 Ser. 2, vol. Ill, p. 251, pi. Ill, fig. 21.) That form, how- 

 ever, has shorter and less deeply excavated sutures. As it may 

 be expedient to distinguish this variety by a name, it would be 

 as well to adopt that given to it by Cornuel, at the same time 

 not retaining the name as of specific importance, but only as a 

 variety of D. pauperata. The four varieties just referred to 

 are so intimately connected by innumerable links that it is diffi- 

 cult to separate them, though they appear so different in the 

 drawings. Figs. 10 to 13 are also varieties of D. pauperata, 

 d'Orb. but will be described and treated of under other appel- 

 lations. 



