6 WAAGEN : CAKBONIPEROtJS AMMONITES^ &C. 



since they accepted the new generic designations in the Ammonites, as 

 being a genus of uncertain definition. There can be no doubt that the 

 reasons why those gentlemen reject the genus are perfectly sound ; and I 

 myself was for a long time very doubtful whether I ought to use the ex- 

 pression or notj but as the word ' Ceratites' conveys to oner's mind a 

 more limited idea of certain forms than the general expression Ammo- 

 nites, I have chosen the first. ' Ammonites' would immediately give 

 to most readers the idea of a Cephalopod with saddles divided all round. 



GoNiATiTES PRiMAS, Woagen, n. sp. 



PI. I, Figs. 4, 4«. 



This species belongs to the strange group of Goniatites, of which 

 Goniatites Orhignyanus, Vern. and Keys., is the type. 



The whole shell is strongly depressed, flat, disciform. The rmibi- 

 licus extremely small, the whorls enveloping each other nearly entirely. 

 The section of the whorls is sagittiform, with a very narrow, excavated 

 siphonal side. The cast, the only thing accessible to my investigation, 

 is smooth, without any ornamentation. The whorls rapidly increase in 

 height, so much so, that the height of the preceding whorl is only 

 about one quarter of the height of the next following ; the thickness, 

 however, increases only slowly. 



The lobes are most extraordinary; they are so much divided that 

 they strongly recall the lobes of an Ammonite. 



The siphonal lobe is divided into three very distinct parts, which are 

 separated by deep and very narrow saddles. The middle part is a long, 

 narrow, pointed lobe with dentitions on both sides, which Ue in the ex- 

 cavation of the siphonal sides. It is limited on both sides by saddles, 

 as long and not broader than itself, which are cut in on opposite sides 

 by the numerous dentitions of the outer part of the siphonal lobe; 

 this latter is very unsymmetrical, finishing in a somewhat leaf-shaped 



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