312 Aim all* of Hie Sontli African Museum. 



1913. Adolpliia nisoides, Kilian. " Lethaea Geognostica. II, Mesoz.," 

 3, I, ' Unterkreide,' fasc. 3, pp. 337-8. 



A completely septate specimen (No. 5119), with the suture-lines 

 well shown, has the following dimensions : 



Diameter .... 39'5 mm. 

 Height of last whorl . 53 per cent, of the diameter 



Thickness . 23 



Umbilicus . . . . 11 



Being a cast and slightly worn, the specimen has the tine ornament, 

 which distinguishes the species from A. nisum, d'Orbigny sp., only 

 preserved in one or two places, and near the umbilicus, but there is 

 very good agreement in all characters with Sarasin's type. Kreukel's* 

 Delagoa Bay specimen (Oppelia nisus) agrees with the present example 

 in smoothness and in whorl-section. 



The hollow keel is the important distinguishing feature of this form 

 from the flat and smooth examples of Pseudoschloenbachia, e. g. 

 P. griesbachi, Crick (M.S.) sp.t which have a veiy similar suture-line 

 (compare figs. B8 and B9, p. 241), but less parallel sides, and which 

 are of Senonian age. 



Hyatt's genus Aconeceras+ has priority before Stolley's Adolpliia,^ 

 and Hyatt may have been right in assigning this genus to Desmocera- 

 tld?e. It probably has nothing to do with Oppelidse. 



GEN. CHELONICERAS, Hyatt, 1903. 



2. CHELONICERAS GOTTSCHEI, Kilian sp. 

 (PI. XXYI, figs. \a-d.) 



1902. Acantlwceras (Parahoplites) martini, d'Orbigny sp., var. gottschei. 



Kilian, " Apt. i. Siidafr.," Centralbl. f. Min., etc., p. 465. 

 1910. Douvilleiceras martini, var. yottschei, Kilian. Krenkel, "Apt- 



foss. d. Delagoa Bai," N. Jb. f. Min., etc. (I), p. 144, pi. xvii, 



figs. 4, 5, 8, 9. 



* Loc. cit., p. 14-2, pi. xvii, figs. 1 and b, and p. 164. 



f = A. umbolazi, Griesbach ('Q.J.G.S.,' vol. xxvii [1871], p. 63, pi. iii, fig. 1), 

 non A. ztmbulazi Baily (B.M., No. C19428), a smooth form of 103 mm. diameter, 

 with the greatest whorl thickness at the middle of the side, not near the umbilical 

 border, as in A. umbulazi, typus ; with umbilical tubercles, but no costation, 

 and with faint constrictions, like P. pupillata, G. C. Crick (M.S.) sp. 



I ' Pseudoceratites/ 1903, p. 100. 



" lib. Nordd. .Equival. Clansayes Fauna, etc.," ' Centralbl. f. Min.,' 1907, 

 p. 269 (foot-note). 



