. Annals of the Carnegie Museum. Carnegie Museum; Carnegie Museum of Natural History; Natural history. 6 7 8 Fig. 6. Pliomerops canadensis (Billings). Copy of Billings' figure, twice natural size. On the specimen, which is now before the writer, the median furrow is so faint that it can hardly be seen. It is not present on mature specimens. Fig. 7. Pliomerops barrandei (Billings). Copy of Billings' figure. Fig. 8. Pliomerops senilis (JidLvrd^nAe). After Barrande. belong to this subgenus. This last species has a peculiar glabella, the median furrow showing on the cast and the first lateral furr
. Annals of the Carnegie Museum. Carnegie Museum; Carnegie Museum of Natural History; Natural history. 6 7 8 Fig. 6. Pliomerops canadensis (Billings). Copy of Billings' figure, twice natural size. On the specimen, which is now before the writer, the median furrow is so faint that it can hardly be seen. It is not present on mature specimens. Fig. 7. Pliomerops barrandei (Billings). Copy of Billings' figure. Fig. 8. Pliomerops senilis (JidLvrd^nAe). After Barrande. belong to this subgenus. This last species has a peculiar glabella, the median furrow showing on the cast and the first lateral furrows being represented by pits. Genus Ceraurus Green. Subgenus Nieszkowskia Schmidt. Nieszowskia sp. ind. Plate XVIII, figure 13; Plate XIX, figure 20. A single pygidium which probably belongs to one of the described species of this genus has been found at Chazy. The axial lobe shows two narrow convex rings which extend across its full width, and back of them a ring which has so fused with the terminal triangular segment as to produce a circular ridge. Within the circle so formed is the remnant of another segment, forming a small hemispheric mound. The pleura consist of two pairs of segments with free terminations. Locality.—McCullough's sugar-bush, Chazy, New York. No cranidia of Nieszkowskia have yet been found at this locality. ^"American Journal of Science, Series 4, XIX, 1905, 377. In designating A. canadensis as the type it is to be understood that the species described under that name in my paper of 1905 is meant. Billings figured and described as the type of this species a small specimen with a furrow in the front of the glabella. This is an immature individual, retaining this during the early stages of the ontogeny Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original Carnegie Museum; Carnegi
Size: 2370px × 1055px
Photo credit: © Library Book Collection / Alamy / Afripics
License: Licensed
Model Released: No
Keywords: ., booka, bookcentury1900, bookdecade1910, booksubjectnaturalhistory
