REPORT OF THE STATE PALEONTOLOGIST 1902 915 



Greigsville it is rare, but at Moscow it is abundant, specially 

 near the Delaware, Lackawanna and Western Railroad, where 

 there is the greatest number of larger forms* Total speci- 

 mens 29. 



Orthoceras scintilla Hall(?), mut. mephisto Clarke 



Plate 4, fig. 14 

 Orthoceras mephisto Clarke. U. S. Geol. Sur. Bui. 16. 1885. p. 29 



This tiny form is smooth on the surface, it is extremely 

 slender, circular in section and tapers very slowly, 3° being its 

 apical angle. The siphuncle is central and rather small, not 

 deeply impressed on the cast. The length of a chamber is 

 about equal to the diameter. The pyrite form differs from its 

 progenitor in being about one fifth to one fourth as large, and 

 in the siphuncle being smaller in proportion. Otherwise the 

 resemblance is striking, the great length of the chambers being 

 the distinguishing feature. It measures l / 3 of a mm in 

 diameter, and is very uniform in size. It occurs at Canan- 

 daigua lake and Livonia salt shaft with fair abundance, and 

 sparingly at Greigsville. Total specimens 25. 



Orthoceras nuntium Hall 



Plate 5, fig. 9 



This species, characterized by its undulating surface, occurs 



at Canandaigua lake and Livonia, being scarcely dwarfed. It 



seems to occasionally have drifted into the foul iron waters, 



but not to have lived there; for not a single dwarf of the species 



came to light. 



Genus bactrttes Sandberger 



Bactrites (sp.) mut. pygmaeus no v. 



Plate 4, fig. 12, 13 



A single specimen consisting of three chambers in a fine state 

 of preservation was found. The surface is smooth. The sec- 

 tion is circular. Siphuncle close to the side, septa strongly 

 oblique, apical angle 5°. The form is very like the species 

 described as Orthoceras aptum, from the Marcellus 

 shales. It measures 2 mm in diameter and 4 mm in length. 

 Found at Canandaigua lake. 



