Review of Recent Geological Litetature. 3 1 7 
has a thickness of 500 or 600 meters, is gray in color, in part massive, 
partly distinctly bedded and bears flints only in the lower portion. 
Fossils are abundant and the fauna is especially rich in Chamidae and 
Rudistae, thus closely resembling in general aspect the fauna of the 
Caprina or Edwards limestone of Texas, although the species are 
Jiearly all different. The faunal list is as follows: 
Hippurites (X'accinnites) mexicanus Barcena. 
Hippurites sp. 
Caprotina sp. nov. 
Ichthyosarcolites of. occidentalis (Whitfield). 
Sphccrucaprina felixi Boehm. 
Sphaerucaprina lenki Boehm. 
Sphaerucaprina sp. 
Caprina cf. adversa d'Orb. 
Caprina ramosa Boehm. 
Ostrea sp. nov. 
Actseonella (Volvulina) dolium Roemer. 
Actseonella (Cylindritella) coniformis Roemer. 
Nerinea sp. 
Nerinea castilloi Barcena. 
Triploporella fraasi Steinmann. 
Nubecularia sp. 
Globigerina cretacea d'Orb. 
Bulimina sp. 
Orbitolina aff. lenticularis. 
Lobocarcinus sp. nov. 
Of these fossils only the two species of Actatonella are known to 
occur in Texas, where they are found in the Fredericksburg division 
of the Comanche series. It is possible, however, that some of the 
species of Chamidae are identical with Texan forms that have been 
■described under other names. At any rate, Bose is probably justified 
in correlating this formation with a part of the Comanche series, but 
he is careful not to correlate it with any particular formation in the 
Comanche. 
The author states that the Mexican Cretaceous has two distinct 
facies — a northerr one which is like that of Texas, and a southern 
which has little in common with it. A list is given of J}, Cretaceous 
invertebrate species common to Texas and Mexico, of which 67 occur 
in the north and only 16 in the south. This list contains a number 
of species that are said to occur in the Comanche series of northern 
Mexico, but in higher horizons in Texas, as follows; 
Hemiaster texanus Rcemer. 
Gryphaea vesicularis Lamarck. 
Exogyra ponderosa Rcemer. 
Plicatula incongrua Conrad. 
Vola quinqecostata (Sowerby), 
