. Bulletin of the Museum of Comparative Zoology at Harvard College. Zoology; Zoology. EASTMAN: CARBONIFEROUS FISHES FROM THE CENTRAL WEST. 197 1883. Sandalodus laevissimus St. John and Worthen, Pal. Illinois, Vol. VII., p. 186, PI. XII., Figs. 8, 9 (and 5?). 1897. Deltodus grandis J. S. Newberry, Trans. N. Y. Acad. Sci., Vol. XVI., p. 297. 1900. Sandalodus laevissimus C R. Eastman, Amer. Nat., Vol. XXXIV., p. 581, Fig. 1. 1902. Sandalodus laevissimus O. H. St. John, Amer. Nat., Vol. XXXVI., p. 659. This species is very abundant in the Keokuk limestone of Iowa, Illinois, and Missouri, numerous
. Bulletin of the Museum of Comparative Zoology at Harvard College. Zoology; Zoology. EASTMAN: CARBONIFEROUS FISHES FROM THE CENTRAL WEST. 197 1883. Sandalodus laevissimus St. John and Worthen, Pal. Illinois, Vol. VII., p. 186, PI. XII., Figs. 8, 9 (and 5?). 1897. Deltodus grandis J. S. Newberry, Trans. N. Y. Acad. Sci., Vol. XVI., p. 297. 1900. Sandalodus laevissimus C R. Eastman, Amer. Nat., Vol. XXXIV., p. 581, Fig. 1. 1902. Sandalodus laevissimus O. H. St. John, Amer. Nat., Vol. XXXVI., p. 659. This species is very abundant in the Keokuk limestone of Iowa, Illinois, and Missouri, numerous perfect examples being known of both the posterior and anterior dental plates of upper and lower jaws. Most of the posterior dental plates have suffered the loss of the initial coiled portion, which is re- markable for being wound upon itself one and one-half times before expanding into the func- tional grinding surface characterizing the adult, as shown in the adjoining text-figure. The upper posterior dental plate resembles in a general way that of S. morrisii Davis, and is much less pli- cated than the lower. There can be no doubt as to the correctness of St. John and Worthen's conclusion that the type of Deltodus grandis Newb. and Worth, is identical with this species, hence we are unable to agree with the views expressed on this subject in the posthumous paper of Newberry.^ Dr. 0. P. Hay is evidently mistaken in his remark that no type of the genus Sandalodus has been specified,^ for S. laevissimus is expressly designated as such by St. John and Worthen in their general observations on teeth of this form.^ Dr. Hay is also in error, we believe, when he discards the specific title of S. laevissimus in favor of S. crass us. But possibly this may be due to an oversight on his part, since the original description of S. laevissimus with its -^ ,, accompanying illustrations — that which heads <-, , ; i ? • • -vt j . Sandalodus laevissimus N. ana the list ni the above syn
Size: 989px × 2526px
Photo credit: © Book Worm / Alamy / Afripics
License: Licensed
Model Released: No
Keywords: ., bookauthorha, bookcentury1800, bookdecade1860, booksubjectzoology
