Rathbun.] 86 [May 15, 
Comm., 1876.) This species was also found by Mr. A. Agassiz, asso- 
ciated with Vitulina pustulosa, in Devonian deposits on the island of 
Coati, Lake Titicaca, Bolivia. 
Vitulina pustulosa Hall. 
_ Vitulina pustulosa Hall, 13th Rep. St. Cab. N. Y., p. 82, 1860; Pa- 
leont. of N. Y., 1v, p. 410, 1867; Rathbun, Bull. Buff. Soc. Nat. Sci., 
I, no. 4, p. 255, pl. 1x, 1874. 
This species is very abundant in the sandstone beds of Ereré and 
the Rio Mecurti, and the specimens from these two localities agree 
quite closely with one another in all their variations. A slender sep- 
tum is often preserved in the ventral valves from the Mecuru, and 
specimens from this locality often have more prominent plications 
than those from Ereré. Only a few very small specimens were found 
on the Rio Curua. 
Ereré. (Morgan Exs., 1870 and ’71; Geol. Comm., 1876.) Rios 
Mecurti and Curud. (Geol. Comm., 1876.) 
CONCLUSIONS. 
To aid in comparing the faune of the three Amazonian Devonian 
localities, there is given in the following table a list of the species de- 
scribed in the preceding pages, with the locality or localities at 
which each was found. 
By reference to this list it will be seen, that of the twenty- 
one species recorded from the Mecurt, thirteen were also found on 
the Curua, all the commoner species of the former locality, excepting 
Spirifera duodenaria (?), being represented at the latter place. The 
relationship existing between the Ereré fauna and the Mecuru is 
not so close. No Lingule were obtained on the Mecuru, though 
two species were found in the Ereré sandstone. Chonetes Comstocki, 
so abundant, and often of large size, at Ereré, is rare on the Mecu- 
ru, and C. Herbert-Smithi is not found there at all. Spirifera Ped- 
-roana, Retzia Jamesiana and f. Wardiana, all abundant at Ereré, 
are very sparingly represented on the Mecurut. 
On the other hand the common Mecurt species, Orthis Haritu, 
Strophodonta perplana, Spirifera duodenaria (?) and Amphigenia elon- 
-gata do not occur at Ereré; and there are several types of Spirifera 
and a Productella confined to the Mzcurti beds. Chonetes Freitasu, 
Orthis Nettoana, Rhynchonella dotis.and Tropidoleptus carinatus are 
very abundant in the. Mecuni-beds, but in the collection from Ereré 
they are represented by only a few specimens each. Streptorhynchus 
