20 AMERICAN JOURNAL 



slightly forwards ; with a wide longitudinal anterior sulcus, pro- 

 duced into a rounded lobe beyond the margin. 



This genus differs from Gadinia in the sulcus being straight 

 and longitudinal, instead of directed to the right ; in the termi- 

 nation being produced beyond the margin, instead of producing 

 an emargination ; in having a mammillated apex and externally 

 conspicuous sulcus, while in (Jadinia the apex is inconspicuous 

 and the sulcus is usually invisible externally; and finally in having 

 the apex probably directed forward instead of backward, as 

 seems to be the normal state of G-adinia. 



Its affinities appear to be rather with Emarginula than G-ad- 

 inia^ and I have appended this notice of it because the synonymy 

 is confused, and Chenu has placed it in the Gadiniidoi. 



It is certainly not identical with Jleniitoma, Swainson, with 

 which Woodward unites it, of which the type is Suhemarginula 

 tricostata, Sby., sp. It also differs essentially from 3Ieto23toma^ 

 Phil., which Chenu gives as a synonym. The type of Metoptoma 

 is the shell figured as "P. Solaris,'' Chenu, p. 376, i, fig. 2821, 

 according to Prof. F. B. Meek. 



Type. 



Deslongchampsia Eugenei, McCoy. 



i). Eugenei, McCoy, MS. Morris and Lycett, Mon. Gt. Ool. 

 Moll, i, p. 94, pi. xii, fig. 13, 13a, 1850. Morris, Cat. 

 Brit. Foss. 1854. Chenu, Man. de Conchyl. i, p. 376, 

 figs. 2819, 2820. 



D. testa suborbiculata, conica, apice subcentrali, acuto, sulco 

 antico lato striato ; costis numerosis, longitudinalibus, transver- 

 sisque decussantibus, sulcus interstitialibus profundis. Alt. 31., 

 lat. 6 1. 



Fossil in the Great Oolite beds of Minchinhampton, found 

 rarely in the white stone of Eastcombs and Bussage. 



Chenu's figure gives the idea of a much smoother and more 

 regularly radiated shell than that figured by Morris and Lycett. 

 The regular crenulations of the margin, as figured by Chenu, are 

 not found in the original figure, in which the apex is also much 

 less smooth and mammillated. 



Deslongchampsia loricata, Laube. 



D. loricata, Laube, Gast. des braunen Jura von Balin ; Sitz. 



Kais. Ak. Wiss. Wien, 1866, p. 82 (name only). Sto- 



liczka. Pal. Indica, Vol. II, p. 324. 

 This species is catalogued by name without description or 



