31 S Scientific Intelligence. 



16. La Fauna de Moluscos del Senoniano de Cardenas, San 

 Luis Potosi ; por Emilio Bose. Boletin 24, Inst. Geol. de 

 Mexico, 1906, 95 pp., 18 pis. — This quarto volume should be 

 studied in connection with the pamphlet De San Luis Potosi a 

 Tampieo y by Emilio Bose. Guide Geol. au Mexique, Tenth 

 Internat. Geol. Congress, 1906, pt. xxx. 



In this work are described the Mollusca of the Cardenas series 

 (Lower Senonian) of the Upper Cretaceous found near the edge 

 of the Mexican plateau between Cardenas and Las Canoas, on the 

 railroad from San Luis Potosi to Tampieo. Of species there are 

 41 (27 new) ; Plesioptygmatis is the only new subgenus. 



The Cardenas limestone series reposes on other limestones with 

 Pudistes, referred to the Turonian or middle Cretaceous portion 

 of the Upper Cretaceous. It has an approximate thickness of 

 1800 feet and is divisible into three formations yielding the fol- 

 lowing fossils : Beginning at the base are the Gryphaea beds 

 with Gryphaea vesicularis, Exogyra costata, and Ostrea agui- 

 lerae. These are followed by the Orbitoicl.es limestones having 

 also Ostrea cfr. goldfussi, Inoceramns cfr. cripsii, and corals. 

 The upper member is the Coralliochama limestone with C. 

 boehmi, Padiolites austinensis, Piradiolites (3 species), Exogyra 

 costata, Ostrea glabra and 3 other species, Anomia argentaria, 

 A. gryphorhynchus Lima (2 species), and gastropods of the genera 

 JVatica (1 species), Turritella (3), Nerinea (l), Cerithium (4), 

 Actaeonella (10), and banks of corals. 



" Our fauna is apparently isolated among the Cretaceous 

 deposits of America. As American elements we do not find 

 more than Inoceramns cfr. simpsoni, Anomia argentaria, A. 

 gryphorhynchus, Ostrea glabra, Exogyra costata and the genus 

 Coralliochama. " 



. " From the foregoing we see that probably the fauna of the 

 lower division of the Blue Mountain Series [Jamaica] represents 

 one similar to ours ; but the necessary paleontological proofs are 

 wanting ; only a careful study of the fauna can solve the prob- 

 lem. 



" Our fauna is in intimate relation with those of Europe and 

 especially with those having the mediterranean facies [as those of 

 Gosau], but to it have been added some types of the fauna of 

 the North. As already stated, however, our faunas are not 

 always identical with those of Europe, but generally they are 

 somewhat distinct in character ; there must have been a relatively 

 rapid migration from Europe to America, and as all our species 

 lived near the coast this migration should have been effected 

 largely by means of a continent or a series of islands instead of 

 the present Atlantic ; perhaps a study of the fauna of Jamaica 

 will demonstrate later that that place was one of the stations on 

 the road over which the animals came." 



" In Europe the Gosau strata represent a mediterranean facies 

 and are notably distinguished in their paleontological character 

 from the Senonian of the North of Europe. In America we 



