98 NEW YORK STATE MUSEUM 



Tentaculites scalaris Schlotheim 



Plate 22, figures <j-n 



Tentaculites scalaris Schlotheim. Petrefaktenkunde, j >. 3 7 7 , pi. 20, fig. 8, 9 ; et 



auctorum 

 Tentaculites scalaris Schlotheim. N. Y. State Mus. Bui. 107. 1907. P-J74 



There are no evidences of distinction between specimens of Tentacu- 

 lites found in the Chapman Plantation and this well known Coblentzian 

 species. Our specimens bear the strong rounded annulations, subject to 

 very slight variation with some irregularity in the intervals and these annu- 

 lations are covered with fine concentric lines. 



Locality. Edmunds Hill. 



Conularia cf. huntiana Hall 



PLite 22, figures 12. 13 



See Conularia huntiana Hall. Palaeontology of New York. 1859. 3:348, 

 pi. 72A, fig. 3 



So far as exterior markings can be relied on for the identification of 

 species this Helderbergian form appears to be present in the Chapman 

 Plantation. The specimens present two of the four sides of a narrow and 

 slender shell in which the surface is transversely lined by elevated ridges at 

 usually irregular intervals, in some places crowded, in others less frequent, 

 the depression being puckered into vertical elevations and depressions which 

 may rise to the summits of and crenulate the intervening ridges. In the 

 detail of structure it is in contrast to such early Devonic Conularias as C. 

 lata Hall, in which the sculpture is a series of beads on the ridges only. 



Locality. Presque Isle stream. 



Plectonotus cf. derbyi Clarke 



PI. He 24. figures i 1 1 



See Plectonotus derbyi Clarke. The Paleozoic Faunas of Para. Eng. ed. p. 38, 

 p'-3, "g- '4-1* 



With the types of this species from the Maecurd river before me I can 

 observe no very material difference between them and the sulcate shells here 

 figured from the Chapman Plantation. These bear the two deep lateral 

 sulci, between them lying the broad, flat dorsum and at the aperture a reen- 

 trant median angle expressing together with faint median revolving furrows 

 the same evidence of a slit band as that found in the specimens of P . der- 

 byi. The latter at times exceeds the dimensions of the Maine shells but 

 these nevertheless attain notable size. There is a considerable series of 

 these sulcate bellerophons which, as we have heretofore pointed out, have 

 commonly passed under the term Pellerophon trisulcatus Sow- 



