212 University of Texas Bulletin 



At the first view 1 our species resembles greatly a Stephanoceras, a simi- 

 larity which has been noted also in other species of Fagesia especially 

 Fagesia superstes Kossmat. 1 From this species, which represents the type 

 of the genus, our species differs by being much more evolute and by its 

 stronger ribs; the umbilical nodules are less numerous and thicker, the 

 ribs are also less numerous and a little stronger. 



Our species is certainly the most evolute one of all the Fagesia so far 

 described, but its nearest relative is without doubt Fagesia superstes 

 Kossmat. According to the figure published by Kossmat no nodules can 

 be seen on the internal whorls, while in our species these nodules can be 

 distinguished even on the smallest whorls. 



The occurrence of this species is of certain stratigraphical importance 

 in so far as it belongs to a very characteristic group which seems at present 

 to be limited to the Turonian. According to Pervinquiere only six species 

 are known and all of these belong to the Turonian. Fagesia superstes, 

 which resembles ours more than any other species, has been found in 

 India (upper Utatur group) and in Tunis (lower Turonian) ; similar forms 

 have been discovered in the Turonian of Portugal and France. 2 



Number of specimens : 2. 



Age: Lower Turonian (Salmurian), lower horizon. 



FAGESIA PERVINQUIERI sp. nov. 

 PI. 14, fig. 3 



In the lower horizon of our Salmurian we find a relatively well preserved 

 specimen which belongs to Fagesia but differs essentially from the fore- 

 going species by its entirely different form and the weaker ornamentation. 

 Its general features are: 



Shell subglobose, very involute, with whorls of transversally semilunar 

 cross-section. The umbilicus is narrow and deep, the umbilical wall is 

 nearly vertical. On the umbilical border of the internal whorls appear 

 not very strong nodules; on the last part of the external whorl the um- 

 bilical border seems to be entirely smooth. On the internal whorl we 

 observe numerous broad and low ribs which are strongest in the central 

 part of the ventral portion, while they seem to flatten out toward the 

 umbilical border. On the ventral portion the ribs curve slightly toward 

 the front. The number of ribs could not be counted because the ventral 



iRossmat, Siidind. Kreideform., p. 26 (133), pi. 6 (17), fig. 1. 

 2 Pervinquiere, Paleontologie Tunisienne, p. 325, note 5. 



