200 University of Texas Bulletin 



similar to the beds of Mexico, with Inoceramus labiatus ; and in the central 

 United States by the Benton and the Colorado formation. This latter 

 probably contains also the Emscherian. The cephalopods collected in these 

 beds are entirely different from those of the Mediterranean Salmurian 

 and seem to occur in slightly younger beds. Possibly the Salmurian may 

 yet be found in Texas, as there is only a short distance between this state 

 and our locality. 



From the foregoing we reach the conclusion that our fauna of Cerro 

 del Macho has very near relations with the African and Portuguese facies 

 of the Salmurian and that a similar fauna probably exists in South Amer- 

 ica on the Pacific coast (Peru) as well as on the Atlantic border (Brazil). 

 In South America, especially in Peru, the similarity with the faunas of 

 north Africa appears to begin even in the Cenomanian (Schlagintweit) 

 and to persist still in the Senonian (Lisson), while in Mexico we can 

 not say the same, although in the Cenomanian as well as in the Senonian 

 there exist certain elements which remind us of forms from north Africa. 

 We certainly have to take into consideration that the fauna of the Ceno- 

 manian of Mexico is still very little known, only the faunas of Cerro del 

 Muleros and of the Vraconian of Camacho, Zacatecas, having been studied 

 in detail; and this latter fauna resembles entirely that of Europe. The 

 few fossils contained in the probably Cenomanian beds of Cerro del Macho 

 seem to indicate in a certain degree that the upper Cenomanian of this 

 region has a fauna similar to that of north Africa; but this problem 

 can only be solved in the future when larger collections have been made. 



The Salmurian faunas of the African-Portuguese region as well as those 

 of Cerro del Macho have some, although not very near, relations with the 

 Salmurian of India and Japan, the connecting elements consisting of a few 

 groups of Mammites, Pseudaspidoceras, Fagesia and Neoptychites; and 

 we might even say that our facies is as much related to that of India and 

 Japan, as it is to that of France and Saxony-Bohemia. 



I do not pretend that these results are to be considered as definite, 

 because the Salmurian in general is yet very little studied, not only in 

 far away countries like India and Japan but also in a great part of Europe. 



PALEONTOLOGY CEPHALOPODA 

 METOECOCERAS Hyatt 



Hyatt 1 proposed the name of Metoecoceras 2 for the forms belonging to 

 the group of Ammonites Swallovi Shumard and united in the genus the 



iHyatt, Pseudocer., p. 116. 



2 I accept the proposal of Pervinquiere to change the original name Metmcoccras 

 into Metoecoceras. 



