Noinendatitre of the Foraminifera. 389 



Lias. Spirillina injima, Joues, 1854. Ibid. 



London Clay. Spirillina, sp., Jones, 1854. Ibid. 



Recent. Spirilli)ia aremicea, Williamson, 1858. Rec. Foram. Brit. p. 93, 



pi. 7. fig. 203. 

 Recent and Fossil. Trochammina (sqtmmata) incerta, Jones & Parker, 



1860. Quart. Journ. Geol. Soc. vol. xvi. p. 304. 

 Recent and Fossil. Ammodiscus (species), Reuss, 1861. Sitzungsb. 



Akad. Wien, vol. xliv. (Zusam. Foram.) p. 365. 

 Recent and Fossil. Trochammina incerta, Parker & Jones, 1862. In 



Carpenter's lutrod. Foram. p. 141 & p. 312, pi. 11. fig. 2. 

 Lower Cretaceous. Cornuspira cretacea, Reuss, 1862 (Sitzungsbericlite 



Akad. Wien, vol. xlvi.). Foram. Hils und Gault &c. p. 34, pi. 1. fig. 10, 



and var. ir7-egidaris, figs. 11 & 12. 

 Tertiary (?). Cornufpira Hoernesi, Karrer, 1866 (Sitzungsb. Akad. Wien, 



vol. lii.), Auftreten Foram. &c. p. 4, fig. 10. 

 Permian. Serpida Roessleri, Schmidt, 1867. N. Jahrb. 1867, p. 583, 



pi. 6. figs. 46, 47. 



For the distinctive name of this Permian Ehizopocl the ap- 

 pellation Trochammina incerta (D'Orb.) has priority ; whilst 

 zoologically (that is, looking only at its real specific relation- 

 ship, and taking the gradations of form as varietal) it belongs 

 to the typical Tr. squamata. For convenience of reference, 

 however, this Foraminifer (PL XIII. fig. 1), as in other cases, 

 keeps a distinct name ; and we must remark that, as a Per- 

 mian organism (if its geological age and position are to be 

 regarded as of any special importance), it first received its 

 trivial name {Roessleri) from Dr. E. E. Schmidt (1867). 



A variety, in which the tube departs, at an early stage, 

 from the spiral to the straight line of growth (this occurs with 

 very many Foraminifers) , has been recognized and figured, as 

 Serjnda Jihim, by Dr. E. E. Schmidt, oj). cit. p. 583, pi. 6. 

 fig. 48, who has associated it with the spiral form (both being 

 regarded by him as Serpula- tubes), because it also is free and 

 not parasitic. 



§ VII. Less regular in its coil, and with a somewhat broader 

 whorl, a closely allied form of this fossil Trochammina accom- 

 panies the foregoing, and is figured in the annexed Plate 

 XIII. figs. 2 & 3. Still more irregularly folded are figs. 4, 

 5, & 6, which represent the well-known " Serjmla i^usilla''^ of 

 Geinitz, the special subject of this notice (see above, § II.). 

 Hegarding these as representing a form requiring a distinctive 

 name, though zoologically linked with fig. 1 (by means of 

 figs. 2 & 3), we must, of course, use the long-established trivial 

 name above quoted, and refer to the fossil as Trochammina 

 jnisilla, Geinitz, sp. We have already remarked that this, 

 with the Spirilline variety, has been included in the zoological 

 species Trocliammina squamata. 



