Manchester Memoirs, Vol. Ixii. (191 7) 73 



In 1868 * C. W. Giimbel described and figured a speci- 

 men of Nodosaria which had limbate sutures ; he gave that form 

 the specific name internodifera. His figure shows a frag- 

 mentary shell consisting of three segments and differing from 

 ours in being quite straight, having long oval segments, and 

 having regular symmetrical limbation on the sutures. It may 

 be noted that the limbation in our variety is asymetrical, or, in 

 other words, the most elevated portion of it is not situated 

 equi-distant from its lateral lines of junction with the surface 

 of the segments. 



(Besides the reference to Gumbel's species given above, 

 many other illustrations of N odosarioe with limbate sutures 

 could be supplied. D'Orbigny in 1840 figured, from the Paris 

 Chalk a form allied to N. farchnen (Soldani), but with limbate 

 sutures, under the name of N . limbala. K. Mittermaier in Mi- 

 crofanna der Oberen Kreideschichten von Trans-Caucasien 

 (Erlangen 1896) plate O. fig. 5, figures a fragment described as 

 Nodosaria sp. in which the limbation is much greater than in 

 either d'Orbigny's or Halkyard's forms. Nodosaria cannce- 

 formis, Reuss (R i860, T.F. p. 364, pi. I, fig. 2) is similarly 

 limbate as the sutures. 



To what extent the limbation of these fossils has been in- 

 creased by the more rapid dissolution of the surface layer of 

 the perforate chambers, as compared with the imperforate shell 

 substance of the sutures, it is impossible to say. Almost cer- 

 tainly some such chemical action has taken place, as we seldom 

 or never find recent specimens of these types showing natural 

 sutural limbation.) 



154. Nodosaria (Dentalina) vetustissima, d'Orbigny. 



Dentalina vetustissima, d'Orbigny, 1849, Prodome de Paleont, 



vol. I, p. 242, No. 261. 



Frequent. A species nearly allied to D. pauperata and con- 

 necting that species with D. consobrina through the latter's 

 variety emaciata. , 



155. Nodosaria simplex, Silvestri. 



Nodosaria simplex, Silvestri, 1872, Atti. Accad. Gioenia ScL 

 Nat., n.s., vol. VII, p. 95, pi. XI, figs. 268-272. 



N. simplex, Brady, 1884, Chall. Rep., p. 496, pi. LXII, figs. 

 4, 5, and 6? 

 Specimens small and rare in our Gatherings. 



* Abh. math. phys. CI. k bayer. Ak. Wiss. X. Abth. II. [1868] 1870, p. 611, 

 pi. I, fig. 15. 



