218 University of Texas Bulletin 



Dimensions: 



Diameter 75 mm. (1) 



Height of the last whorl 32 mm. 0.45 



Width of the last whorl 69 mm. 0.92 



Diameter of the umbilicus 14 mm. 0.19 



Height of the last whorl on the same diameter but half a whorl back- 

 wards 27 ^..-n. 0.36 



Width of the last whorl at the same point 62 mm. 0.83 



Diameter of the largest specimen : 124 mm. 



Our species resembles greatly Vascoceras Kossmati Choffat 1 ; it is of 

 course evident that all the species belonging to this group must be very 

 similar, as none of them shows any ornamentation. The main difference 

 between our species and Vascoceras Kossmati consists in the different 

 curve of the cross section of the internal whorls, which is always of 

 greater radius. The suture is also different, the saddles of our species be- 

 ing relatively higher and the lobes deeper. One might add that our species 

 grows to a larger size than the Portuguese species. 



Vascoceras Kossmati Choffat has been found in Choffat's middle Turon- 

 ian of Portugal, which, according to my opinion, belongs to the Salmurian. 

 In Egypt it occurs in the lower Turonian. 2 Our larger specimens have 

 been found in the upper bed of the Salmurian of Cerro del Macho and the 

 specimen collected by Angermann belongs to the same horizon, judging 

 from its petrographical character. 



Number of specimens : 3 and several fragments. 



Age: Lower Turonian (Salmurian), upper horizon. 



VASCOCERAS sp. 

 PI. 18, fig. 12 



Dr. Haarmann found in the upper horizon of Cerro del Macho a cepha- 

 lopod, the generic determination of which remains somewhat in doubt be- 

 cause its suture can not be made visible. Mr. Frederico Ritter gave me 

 another and a little better preserved specimen which shows traces of the 

 suture. Their features are : 



Shell subglobose of moderate size, very involute with whorls of semi- 

 lunar cross section, broader than high. Flanks and ventral portion round- 

 ed. The umbilicus is small and deep, the* umbilical wall is vertical and 

 even a little overhanging; the umbilical border is angular. The shell 



1 Choffat, Especes nouv. ou peu conn., p. 63, pi. 13, figs. 8, 9; pi. 14, figs. 1, 2; 

 pi. 21, figs. 26, 27. 



2 Eck, Turon in Aegypten, p. 384. 



