414 STUART WELLER 



Hamites, sp. undet. 

 Glyphaea stokesi, n. sp. 



The presence of the ammonites at once marks the fauna as 

 of Mesozoic age, and the presence of such uncoiled forms as 

 Hamites stamps it at once as Cretaceous. In an examination of 

 the fauna for the purpose of making a closer correlation and to 

 determine the relationships of the fauna with the Cretaceous 

 faunas of other portions of the earth, it is found that these 

 relationships point in two directions. The three species, Tubu- 

 lostium callosiinty Lagena ? a?iiarctica and Olcostephanus antarctica, 

 seem to connect the fauna with the Middle or Upper Creta- 

 ceous faunas of southern India. The first of these is a pecul- 

 iar little gastropod which is specifically identical with one 

 originally described from the Utatur formation of southern India. 

 The second species, Lagena? antarctica, is most closely related to 

 L. secans Stol. from the Ariyalur formation of the same region, 

 and the third, Olcostephanus antarctica, most closely resembles 

 Ammo?iites madrasinus Stol., also from the Ariyalur beds of India. 

 In the correlation of these deposits in India, the Ariyalur forma- 

 tion has been referred to the Upper Cretaceous by the Indian 

 geologists, while the Utatur beds are placed in the Middle Cre- 

 taceous. The weight of the evidence afforded by the antarctic 

 fossils, therefore, leans about equally towards the correlation of 

 the beds containing them with the Middle or with the Upper 

 Cretaceous beds of India, which would naturally lead to giving 

 them a place in about the middle of the series. 



In addition to these three species which establish the rela- 

 tionship of the Antarctic fauna with that of southern India, there 

 are two species, Lucmaf townsendi and Hamites elatior which 

 are identified with forms which have been described by White 

 from islands in the Straits of Magellan, thus establishing the 

 connection of the fauna with that of the continent of South 

 America. The specimens of Tubulostium callostim also, are some- 

 what closely allied to a species described by Stanton" as T. 

 pupoides from the Cretaceous beds of Patagonia. 



The evidence afforded by the specimens in the Stokes collec- 



^Rep. Princeton Univ. Exped. to Patagonia, Vol. IV, Pt. I, p. 30. 



