ORTMANN : TERTIARY INVERTEBRATES. 
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proaches more that of the mouth of the Santa Cruz River, is expressed in 
the higher percentage of species that are also found at Santa Cruz, 
although this difference from Oven Point is very slight. 
Both San Julian localities have 9 species in common, but the abundance 
of the respective species at each locality is very different. Taking to- 
gether these two localities, we may regard them as the type of the Juli- 
ense beds, since 7 of the 9 species mentioned by Ameghino have been 
found here. But the fact, that 1 Leonense ( Ostrea ingens ), and 4 Supra- 
patagonian species ( Ostrea ingens, Pecten geminatus , Scalaria rugulosa , 
Struthiolaria ameghinoi ) have been found here, strongly points to the 
conclusion, that these beds also represent what Ameghino calls “Supra- 
patagonian.” 
Two more localities on the coast are: Port of Deseado (Port Desire), 
which has yielded only Pecten cf. centralis , and Port Madryn (New Bay, 
Terr. Chubut), which has yielded Ostrea ingens from two horizons: be- 
tween tides, and 25' above high tide. 
The following localities are situated more or less inland : they all have 
a sandy facies, and often the matrix is composed of fragments of shells. 
Shore of Salt Lake, 10 miles north of the mouth of Rio Chico; near 
the base of the series, within 50' above barren Cretaceous sandstones. 
J Sctitella patagonensis . J * Terebratella patagonica. L & S * Ostrea ingens. 
Even among this small number of species, a Leonense and Suprapata- 
gonian is associated with two Juliense. 
Upper Rio Chalia ; beds immediately underlying the Santacruzian 
beds, containing mammals. Top of marine series. 
J Scutella patagonensis. 
Melicerita triforis. 
J * Terebratella patagonica. 
* Glycimens ibari. 
L&S* Ostrea ingens. 
*Mytilus cf. chorus. 
S *Lucina promaucana. 
* Vemis ?iavidadis ( ? ). 
A * Dos ini a meridionalis ( ? ). 
*Panopea quemadensis . 
Fissurella eurytreta. 
* Gibbula dalli. 
A * Scalaria rugidosa. 
* Ctepidula gr eg aria. 
L * Turrit ell a ambidacrum. 
* Voluta gracilior. 
* Vohtta dorbignyana. 
Verruca Icevigata. 
Balanus various. 
These beds which are undoubtedly near the extreme top of the marine 
series, and which ought to be, according to stratigraphical evidence, Supra- 
patagonian, contain — among 19 — no less than 14 species, which have 
been found also at Santa Cruz (marked*). 4 of the species are charac- 
