308 PATAGONIAN EXPEDITIONS ! PALAEONTOLOGY. 
forms. On the other hand, we have in 5 species (. Meretrix ro strata , 
Galerus mamillaris , Crepidula dilatata, Balanus trigonus , Balanus teems) 
new elements in this fauna, and it is very significant that these are all still 
living species. This introduction of new, recent elements into the Cape 
Fairweather fauna, as compared with the Patagonian, is the most impor- 
tant character, agreeing completely with the stratigraphical position. 
Altogether, the Cape Fairweather fauna contains 8 living species (57 
per cent.), 5 of which are still found in Patagonia ( Crepidula dilatata , 
Trophon laciniatus , Balanus psittacus, B alarms trigonus , Balanus Gem's), 
while 2 are found in Chili ■ [Mytilus chorus and Galerus mamillaris ), and 
1 in Uruguay (. Meretrix rostratd). This fact approximates this fauna so 
closely to the recent one, that we may safely regard the Cape Fairweather 
beds as Pliocene. 
Only a few members of this fauna have been found elsewhere. Pecten 
actinodes was recorded long ago from various localities in Patagonia 
(chiefly the northern part), and has been given by v. Ihering (according 
to Ameghino’s material) for the Tehuelcke formation. The same is true 
in the case of Trophon laciniatus var. inornatus , which is mentioned by 
v. Ihering (as Trophon varians) from the Tehuelche beds (see below). 
Dosinia meridionalis has been recorded (aside from the Patagonian beds) 
from the Entrerios beds , and Turritella innotabilis finds a closely allied 
form in the Pliocene T. cigulatiformis of Chili. Thus it would seem, that 
the Pliocene Coquimbo beds of Chili, the Entrerios beds of Parana, and 
the “Tehuelche” beds are in some degree correlated with the Cape 
Fairweather beds. But since a large number of Coquimbo- and Entrerios- 
species are known (Philippi, Moericke, v. Ihering), the above relations are 
not satisfactory, and if these beds are really contemporaneous, we should 
expect a larger number of affinities. 
On the other hand, we must take into account the much more southern 
location of the Cape Fairweather beds than any of the other beds, and if 
they all really belong to the Pliocene, we should expect considerable 
climatic differences in their fauna. 
For the present it is impossible to say, whether the few relations on the 
one side, and the differences on the other, indicate a difference in age, or 
a difference in geographical position. The solution of this question may 
be obtained by a closer examination of corresponding beds in the north- 
ern parts of Patagonia (from San Julian northward to Entrerios) : we 
have numerous indications that such beds really exist there. 
