338 Annals of tJie South African Museum. 



of Europe, but Lasswitz,"-^' who has recently given a revision of the 

 Chalk Ammonites of Texas in Eomer's collection, considers that the 

 examples figured by de Grossouvre belong to another species — 

 Ammonites quinquenodosuSy Eedtenbacher, vt^hilst he regards ilfo;Yo7i/- 

 cei^as cavipaniense, de Grossouvre,)- as an example of M. texanum 

 (Eomer). If this view is correct then the horizon of M. texanum in 

 Europe is Campanian. M. de Grossouvre \ considers that M. Sonioni 

 is related to M. Bontanti, ^ but it appears to me to differ consider- 

 ably from that species, and to resemble much more closely M. 

 texanum. 



Examples of Mortoniceras from Algeria, Palestine, and Venezuela 

 have been referred to M. texanum. Mortoniceras appears to be 

 unknown in the Senonian of India. The individuals of M. Soutoni 

 attain a very large size. The largest at present known is the type 

 which is in the Museum of the Geological Society, and has a 

 diameter of nearly 48 cm. 



Mortoniceras Stangeri (Baily). 



Plate XLIV., fig. 1. 



1855. Ammonites Stangeri, Baily, Q.J.G.S., xi., p. 455, pi. xi., fig. 2. 

 1872. Ammonites Stangeri, Schliiter, Cephalop. d. oberen deutsch. 



Kreide, p. 45. 

 1895. Mortoniceras Stangeri, Kossmat, Beitr. z. Paliiont. u. Geol. 



Osterr.-Ungarns, kc, ix., p. 184. 

 1904. Mortonicoris (?) Stangeri, Solger, Foss. Mungokreide in 



Kamerun, p. 205. 



This species has been compared with Peroniceras subtricarinatum 

 (d'Orb.) by de Grossouvre, j| but though it is, as pointed out by 

 Kossmat, like Peroniceras in the young stages, it subsequently 

 develops the characteristics of Mortoniceras. 



M. Stangeri appears to be confined to Pondoland. The individuals 

 do not reach so large a size as in the case of M. Soutoni. The type 

 has a diameter of 32 cm., and is in the Museum of the Geological 

 Society of London. 



* Op. cit., p. HI, pi. viii., fig. 4. 



t This has since been identified by de Grossouvre with M. delaicarense (Morton). 

 See Grossouvre, Recherch. sur la Craie super. (1901), p. 379. 

 + Recherch. sur la Craie super. (1901), p. 926. 

 § Ammonites de la Craie super. (1893), p. 77, pi. xvii., figs. 2, 3. 

 II Amm. de la Craie super. (1893), p. 94, pi. x., figs. 1, 2, pi. xi., fig. 1. 



