272 PATAGONIAN EXPEDITIONS : PALAEONTOLOGY. 



2. COMPARISON OF OTHER LOCALITIES WITH THE TYPE FAUNA 



AT SANTA CRUZ. 



(In the following P means characteristic Patagonian, according to v. 

 Ihering ; S means characteristic Suprapatagonian, according to Ameghino 

 or v. Ihering ; / means characteristic Juliense, according to Ameghino ; 

 L means characteristic Leonense, according to Ameghino.) 



Pescadores, Rio Santa Cruz ; ca. 50' above high tide. 



Only Ostrea ingens has been found here. 



Paso del Rio Santa Cruz : 2 miles above Las Salinas (see below), at 

 about high tide level. 



J Schizaster ameghinoi. L & S Ostrea ingens. Turritella breantiana. 



J Terebratella patagonica. S Lucina promaucana. Turritella patagonica. 



Malletia ornata. L Turritella ambulacrum. L Stmthiolaria ornata. 



All of these 9 species are found at Santa Cruz, and 5 of them are Pata- 

 gonian, 2 of which are Juliense, and 3 Leonense, while 2 are Suprapata- 

 gonian. Since this locality represents a very low horizon, close to the 

 water's edge of the Santa Cruz River and the sea, the presence of Leon- 

 ense and Suprapatagonian species is very significant. 



Las Salinas ; 30 miles above mouth of Santa Cruz River, ca. 200' above 

 high tide. 



J Rhynchonclla plicigera. P Cardium puelchum. L Turritella ambulacrum. 



S Cucullaa danvini. Venus meridionalis. . Turritella breantiana. 



Limopsis insolita, Psammobia patagonica. L Stmthiolaria ornata. 



P Cardita intequalis. Marlesia patagonica. P Siphonalia domeykoana. 



All of these 12 species were found at Santa Cruz. This locality is at 

 a much higher level than Paso del Rio Santa Cruz, but has 3 fossils in 

 common with it ( Turritella ambulacrum and breantiana, Stmthiolaria or- 

 nata], two of which are Leonense according to Ameghino. 6 specimens 

 are Patagonian, i of which is Juliense, while 2 are Leonense. Ctictillcea 

 darwini is a Suprapatagonian fossil according to v. Ihering. Thus we 

 have here a mixture of fossils from all three subdivisions. 



Mount of Observation, lower horizon ; from between tides to 25' above 

 tides. 



