Alcide d'Orhigny. 77 



by Eeuss, suggest Litiiola nautiloiclea Lam. The locality given 

 by d'Orbigny, "living in the Island of Cuba and the Antilles," 

 appears to us to furnish a much more probable explanation of its 

 affinity. By far the most abundant Foraminifer in shallow water 

 in the West Indies is Orhlculina adunca (F, & M.), which occurs 

 in endless varieties from nautiloid to discoid, and, more rarely, in 

 an elongate crozier form.^ The crozier portion is occasionally of 

 (piite small proportion to the series of produced chambers, and if 

 the spiral crozier portion were broken away or suppressed, as some- 

 times occurs in Peneroplis,'- a structure resembling d'Orbigny's 

 figure, with a cribrate terminal surface, would result. We have, 

 therefore, no hesitation in referring the genus Conulina to this 

 variety of Orbiculina adunca. 



CuNEOLiNA appears first, as an Enallostegue, in the Cuba 

 Memoir, recorded as a fossil from the Chalk and Greensand of the 

 mouths of the Charente. Ot this he likewise announces a ghost- 

 model, iSTo. 110 in the "Fifth Instalment," but he gives no figure 

 until he repeats the same diagnosis of the genus in the Vienna 

 Memoir and figures the species C. pavonia (pi. xxi, figs. 50-52) ; 

 we reproduce this figure in Plate X, fig. 2. He also cites without 

 any description two other species, C. conica and C. Flcuriausa (or 

 * Fieuriausiana).^ In the " Prodrome " he cites all three species from 

 the Etage 20'"® (Cenomanien) of the Chalk, merely saying that 

 C. conica is narrower than G. pavonia, and C. Fleuriaitsa is narrower 

 still.* Carpenter recognizes this species and reproduces d'Orbigny's 

 figure,^ and his description of it is excellent. He says it is 

 " nothing less than a Textularian, which is extremely compressed 

 in a direction transverse to the normal direction of its compression ; 

 for if we could imagine a Textularian with globose chambers to be 

 composed of a plastic substance, it can easily be conceived that 

 whilst, by pressure applied to the two axial faces, those two faces 

 n:iight be extended and thinned out until they represented the flat 

 triangular shape which distinguishes Cuneolina (each face being 

 divided by the axial line on the two sides of which the two series 

 of chambers would still be disposed), a like pressure being applied 

 to the two margins would flatten the two series of chambers 

 against one another so as to convert what were before the margins 

 into lateral faces and to bring what were before the axial faces 

 into the condition of margins " (see Plate X, fig. 2). The only 

 discordant opinion as to the relation of Cuneolina with Textularia 

 is that of Schlumberger,^ expressed in a short note in which, in a 



^ See A. Earland, "On Orbiculina adunca (P. & M.) and its Varieties," Journ. 

 Quekett Micr. Club, ser. 2, vi. (1898), pp. 88-92. 



- Cf. Monalysidium polita Chapman. (See XXVII., p. 603.) 



'' VII., p. 150; XII., p. 253, pi. xxi., figs. 50-52. 



' XV., vol. ii., p. 186. '- XVII., p. 193, pi. xii., fig. 17. 



" C. Schlumberger, "Note sur le Genre Cuneolina," Bull. Soc. G6ol. France, 

 ser. 3, xi. (1883), pp. 272-3. 



