180 University of Texas Bulletin 



Avicula of the group of A. gravida Coquand, the gastropods to Tylostoma 

 and similar genera. 



A short time afterwards I showed these fossils to Dr. E. Haarmann, 

 geologist of the Cia. Perforadora Mexicana, who then told me that he had 

 a much larger collection of fossils from the same locality which he had 

 made before Dr. Angermann had visited the place ; and he offered me his 

 material for a detailed paleontological study. The collection of Dr. Haar- 

 mann proved to be much larger than that of Dr. Angermann and con- 

 tained a large number of ammonites some of which were rather well 

 preserved. Haarmann in making his collection had separated the fos- 

 sils of the different beds. The lowest of these beds was represented by 

 a single piece of rock with impressions of bivalves, but as this rock had 

 a very distinct character from that of the other beds and as in a locality 

 of apparently the same age a badly preserved sea urchin had been found 

 which appeared to belong to Hemiaster, I asked Dr. Haarmann to collect 

 better material in the lowest horizon, because this horizon seemed to be- 

 long to the Cenomanian. Haarmann visited the locality again in August, 

 1911, collected ammonites in each of the three beds distinguished by him, 

 and turned this material over to me in April, 1912. 



The material thus collected proved to be of great stratigraphical and 

 paleontological interest, as will be shown by the following description. 

 But before I enter into a detailed study I wish to express my gratitude 

 to Dr. E. Haarmann to whose amiability I owe the opportunity of studying 

 this interesting fauna. I also wish to express my obligations to Professor 

 Dr. W. Branca in Berlin who kindly sent me a great number of photo- 

 graphs of Turonian ammonites from Egypt, studied by Dr. Eck but at 

 that time still undescribed. 



LIST OF LITERATURE CITED IN THIS PAPER 



1. Boule, Lemoine et Thevenin, Diego Suarez. M. Boule, P. Lemoine et A. Thevenin, 



Paleontologie de Madagascar. Cephalopodes cretaces des environs de Diego- 

 Suarez. Ann. de Palontologie t. I et II, Paris, 1906-07. 



2. Choffat, Especes nouv. ou peu conn. P. Choffat, Recueil d'etudes paleontologiques 



sur la faune cretacique du Portugal. Vol. L, Especes nouvelles ou peu 

 connues. Ire. serie. Section des Travaux geologiques du Portugal. Lisbon, 

 1886. 



3. Choffat, Syst. cret. Portugal II. P. Choffat, Recueil de Monographies strati- 



graphiques sur le systeme cretacique superieur au nord du Tage. Service 

 geol. du Portugal. Lisbonne, 1900. 



4. Chudeau, Ammonites du Damergou. R. Chudeau, Ammonites du Damergou 



(Sahara meridional). Bull. Soc. geol. France, 4me ser., t. 9, fasc. 1-2, 1909. 



5. Coquand, Geol. et Pal. de Constantine. H. Coquand. Geologic et Paleontologie 



de la region sud de la Province de Constantine. Mem. Soc. d'Emulation de 

 la Provence, II. Marseille, 1862. 



