156 M. E. Beyrich on the Goniatites. 



saddle. The second lateral lobe is but half the depth of the 

 first ; the second lateral saddle scarcely reaches the height of 

 the dorsal saddle, and declines strongly towards the suture. 

 The increase in height is 0*51 ; the increase in breadth 0*55. 

 Nearly half the interior whorls are enveloped. 



Besides the fragment in the Museum of Bonn, there is a 

 more complete and better preserved specimen of this ammonite 

 to be found in the collection of Dr. Hassbach of Bensberg. 

 According to his assertion, it came from the transition lime- 

 stone near the quarry (Steinbreche) not far from Bensberg, 

 that is to say, from a limestone identical with that of the Eifel. 



8. Ammonites multiseptatus, Von Buch. 

 L. Von Buch Goniat. p. 42. PL II. fig. 13. 



The dorsal lobe is small, its breadth and depth nearly 

 equal. Of the four lateral lobes the first is three times the 

 depth of the dorsal lobe, the second is the deepest, the third 

 and fourth are smaller, and there is the commencement of a 

 fifth. The lateral saddles as well as the dorsal saddle are 

 broad and rounded ; the second of them is most elevated. 

 The increase in height is 0*53 ; the increase in breadth 0*48. 

 There are fifty-six chambers in one whorl. 



Of this ammonite, which is well characterized by the form 

 of the lobes and number of the chambers, we know at present 

 only a fragment in the Museum at Bonn. It is changed into 

 pyrites, and may very probably belong to the transition lime- 

 stone of the Eifel, where pyritose fossils often occur. 



9. Ammonites multilobatus, n. s. PI. I. fig. 9. 



Upon the flat and smooth side are six and sometimes even 

 seven lateral pointed lobes ; the first five from the back be- 

 come gradually deeper ; the fifth is the deepest ; after that fol- 

 lows a sixth, much smaller, and probably also a seventh. The 

 lateral saddles are pointed; the fifth is the most elevated. 

 The form is discoid, the back very narrow, and rounded off 

 at its junction with the flat sides. On account of the number 

 of lobes and the great diflerence of form between this and all 

 the other Goniatites, I have thought it right to establish it as 

 a species, though I possess but an insignificant fragment from 



