RECOBDS OF MEETINGS 395 



skull are not synostotic with it. There was no obvious pterygoid apophy- 

 sis of the greater wing. Until younger and even embryonic material is 

 available for study the interpretation of this complex must remain prob- 

 lematic. In both genera a lachrymal separate from the malar was found 

 in Ziphius caudal, in Kogia mesal to the expanded portion of the lattier 

 element. In Kogia the frontal process of the maxilla enters extensively 

 into the wall of the cardinal cavity, 'the frontal bone itself being com- 

 pressed to a narrow plate between the maxilla and supraoccipital. In 

 this character Kogia departs widely from Physeter and the Ziphoids. 

 Kogia also has no falciform process of the squamosal, in which again it 

 differs from Physeter and the Ziphoids. The tympanic expands laterad 

 into a massive process which occupied the position usually taken by the 

 mastoid region of the periotic. In this character all the Physeterina? 

 agree. 



The ■ architecture of the mandible in Physeterinse is characteristic and 

 differs from that of the other odontocetes. The margins of the ramus 

 are thickened and proximad are connected with a crescent of thick bone 

 which bears the condyle. The intervening region is reduced to a papy- 

 raceous lamella. In other odontocetes, including the Ziphoids, there 

 is a thickened axial portion of the ramus extending from the condyle to 

 the dentigerous body of the bone. This character of the mandible and 

 the peculiar massive pterygoid would seem to be peculiar to the 

 Physeteringe. 



The Section then adjourned. William K. Geegoey, 



Secretary. 



SECTIOI^^ OF GEOLOGY AND MINEi^ALOGY 



20 November, 1916 



Section met at 8 :15 p. m.. Secretary Chester A. Eeeds presiding. 

 The minutes of the last meeting of the Section were read and approved. 

 The following program was presented: 



E. de Martonne, The Limestone Plateaus of the Gausses, .South- 



EEN Peance. 

 Anna I. Jonas, Pee-Cambeian and Teiassic Diabase in Easteen 



Pennsylvania. 

 A. W. Grabau, Steatigeaphic Eelations of the Oil-Peoducing 



TO THE OiL-BeAEING ShALES IN THE PALEOZOIC OF 



IsToETH Ameeica; Involving a New THEOEy,.,OF 

 Oil Disteibution. 



