. Bulletin of the Museum of Comparative Zoology at Harvard College. Zoology; Zoology. woodworth: geological expedition to brazil and chile. 15. tube penetrating to the bottom of the layer, some five inches in thick- ness. The tubes were filled with a fine greenish shale. (Fig.^2.) Similar burrows occur in Pennsylvania in the Ordovician (J. P. Lesley, '89,1, p. 417-418) but seemingly are of no diagnostic value in determin- ing the age of the strata in which they occur. It is possible that the cup at the orifice of the tube in Monocraterion is due to the caving in of the sands prior to their cov
. Bulletin of the Museum of Comparative Zoology at Harvard College. Zoology; Zoology. woodworth: geological expedition to brazil and chile. 15. tube penetrating to the bottom of the layer, some five inches in thick- ness. The tubes were filled with a fine greenish shale. (Fig.^2.) Similar burrows occur in Pennsylvania in the Ordovician (J. P. Lesley, '89,1, p. 417-418) but seemingly are of no diagnostic value in determin- ing the age of the strata in which they occur. It is possible that the cup at the orifice of the tube in Monocraterion is due to the caving in of the sands prior to their covering by the superincumbent layer, and that thus it is not to be taken as showing the form of the anterior portion of the animal which made the burrow. From Ponta Grossa an excursion was made under the guidance of Dr. Derby to Curityba and thence to the coast at Pa- ranagua. An excellent view of the profile of the plateau and the Serra do Mar was obtained and I have utilized the data in what follows on the geomorphology of south Brazil. From Ponta Grossa also I set out for a trip via Rio Negro, over the trap plateau to Lages in Santa Catharina. expedition includes some observations upon the general character of the country not embodied in North American geographical wTitings, I have transcribed this portion of my Journal with but slight con- densation. A Journey from Rio Negro to Lages and return to Porto da Unido on the Iguassu. It having been decided to make a reconnaissance of the section from Serrinha on the upper waters of the Iguassu to Rio Negro and thence southwards to the base of the Triassic escarpment, the traverse was continued southwards to Lages. The Triassic formation was examined for any evidence which might have a bearing on the transition period following that of Permian glaciation. Dr. Euzebio Paulo de Oliveiro and myself set out from Ponta Grossa on August 13 by rail for Rio Negro, the end of the railway, making stops at Tamandua, Serrinha, and Lapa. A synop
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