Alcide cVOrhigny. * 79 



whoso aperture is practically closed, by four valves converging 

 towards the centre with a cruciform space between them/ It is 

 questionable whether it really is entitled to specific, to say nothing 

 of generic rank, but it is the same class of shell as Schlumberger's 

 Triloculma fulgwrata and T. fischeri, which are characterized by 

 remarkable dendritine apertures.' It may also be compared with 

 Munier-Chalmas and Schluniberger's genus Idalina, or indeed any 

 of the " Miliolidees trematophorees." ^ ( Jarpenter devotes some 

 attention to this genus and reproduces d'Orbigny's figure. How- 

 ever, this exact form of Miliolid does not appear to have been 

 observed or recorded since d'Orbigny's celebrated voyage (see 

 Plate X, tig. 4). 



A more remarkable resurrection than oven that of Pavonina 

 was tlie identitication by Earland and myself of the lost 

 d'Orbignyan species Rotalia duhia, of which almost all that can 

 be said at present with certainty is that it is not a Rotalia. 



The form made its re-appearance, after a lapse of nearly a 

 century, in the material lirought from the Kerimba Archipelago 

 by Dr. J. J. Simpson, which formed the subject of our recent 

 monograph on the locality (Bibl. XXVII. ), and there can be no 

 doubt that d'Orbigny's specimens — or specimen, for we have only 

 found one among his types in Paris — came from the same material 

 as his Favonina JlabeUiformis. We published a preliminary note 

 on the species,* v/hich we may usefully repeat and amplify. 



When we tirst discovered the specimens we were unable 

 to assign them to any definite position, although their rhizopodal 

 nature was unquestionable. Subsequent research caused us to 

 associate the forms with Fornasini's published figure, which we 

 reproduce (Plate X, fig. 5), ^ representing d'Orbigny's original 

 sketch of a form to which he gave this name in the " Tableau 

 Methodique." ^ Fornasini's opinion was that the rhizopodal 

 nature of d'Orbigny's organism was more than douljtful, his 

 opinion, however, being based entirely upon Berthelin's tracing 

 of d'Orbigny's original sketch. It must be borne in mind that 

 Fornasini's figure represents merely Berthelin's tracing from one 

 of the direct sketches of d'Orbigny (see ante, p. 36, Division Y), 

 the surface markings or papillae being merely partially indicated. 

 We thereupon proceeded to verify Fornasini's figure, and to 

 compare our specimens with the original type-specimen in Paris, 

 and we had no hesitation in deciding that the two forms were 



'o 



> See XVII., pp. 75, 80, pi. vi., fig. 15. 



- C. Schlumberger, " Peuille des Jeunes Naturalistes," Ann. xiii. (1S83), p. 107, 

 pi. ii., figs. 1, 2. 



' See Bull. Soc. G6ol., Prance, ser. 3, xiii., pp. 273 et sea. 



* XXVII, p. 546. 



^ C. Porna>iai, " Illustrazione di Specie Orbignyane di Nodosaridi, etc., 

 istituite nel 1826," Mem. Ace. Sci. 1st., Bologna, Ser. 6, v. (1908) p. 46, pi. i., fig. 14. 



« I., p. 274, No. 34. 



