WAAGEN : CARBONIFEROUS AMMONITES^ &C. 5 



Ceeatites caebonarius, Waagen, n. sp. 

 PI. I, Figs. 2, 8, 2,a, 2,b. 



A flat shellj with thin compressed whorls and a very wide umbilicus. 

 The whorls are entirely smooth except on the body-chamber, where 

 shght folds are observable. The folds are sKghtly falciform, directed 

 towards the mouth of the shell on the external margin, but very little 

 bent towards the front on the middle of the sides. The whorls are very 

 shghtly embracing, having only a shallow impression of the preceding 

 whorl on the antisiphonal side. The length of the body-chamber 

 amounts to about one-half or three-quarters of a turn; the shape of the 

 mouth is not presei-ved. 



The form of the sutm-es is veiy simple, the saddles being undivided, 

 the lobes finely dentated. The siphonal lobe is rather short, divided 

 into two equal halves, each of which has two or three dentitions. The 

 external saddle is not very high, broadlj^ rounded ; the first lateral lobe 

 is nearly twice as long as the siphonal, with few very short and fine 

 dentitions at the end ; the lateral saddle is much higher than the exter- 

 nal and comparatively narrower ; the second lateral lobe is shorter and 

 broader than the first, but longer than the siphonal lobe. The second 

 lateral saddle is broad and very short, the first auxihary lobe beino- al- 

 ready concealed by the tunbilical suture. 



The species resembles most Goniatites (?) Gangeticus, De Koninek 

 but has much broader and shorter lobes and saddles than the latter. 



It is very rare to find specimens of Cerat. carhonarius with pre- 

 sei-ved lobes, as the au--chambers are mostly compressed and lost. There 

 is at the same locality in the same bed yet another species of a Ceratite, 

 with strong tuberculated folds on the sides of the compressed whorls, 

 but the specimens I found of this species were too badly preserved to 

 admit of an accurate description. 



It requires some explanatory remarks to show why I use here the 

 expression ' Ceratiies' which has been abolished by most palaeontologists, 



( 355 ) 



