REPORT OF THE STATE PALEONTOLOGIST 1902 907 



typical S. truncata, this pyrite form has about one third 

 the diameter ; is much more broadly truncated and is wider. 



Localities. At Canandaigua lake and the Livonia salt shaft. 

 Total specimens 14. 



Genus productella M all 



Productella spinulicosta Hall, mut. pygmaea nov. 



Plate 2, fig. 11 



Only one specimen of this has come to light from Canandaigua 

 lake. It is like a P. spinulicosta but dwarfed. There is 

 no truncation. Size is 4 mm wide by 4 mm high. The bases of 

 several spines are impressed on the cast. Several concentric 

 wrinkles are present, starting from the hinge line and dying out 

 on the umbonal surface. 



Genus trigeria Bayle 

 Trigeria lepida Hall, mut. pygmaea nov. 



Plate 3, fig. 11 



This species is ovoid in outline, widest a little below the mid- 

 dle, and narrow near the beak. The size is iy 2 mm in hight and 

 1% mm in width. The beak is acute and prominent. The sur- 

 face is covered by 12 narrow, prominent, radiating ridges; the 

 intervening furrows being a little wider than the ridges. 



Locality. Canandaigua lake and the Livonia salt shaft. 

 Total specimens 8. 



CRINOIDEA 



Genus pentremites Say 



Pentremites leda Hall 



Plate 1, fig. 1 



A single specimen was found at Canandaigua lake, a calyx in 

 fair condition. This is 6 mm high and 3 mm wide; i. e. about 

 one third natural size. The pyrite form resembles the normal 

 P. leda except that the ambulacra do not extend so far toward 

 the base, and the base is more abruptly truncated. 



There are also scattered through all the localities a consid- 

 erable number of sections of the stems of two or three genera 

 of crinoids, indicating that some of these creatures at least could 

 live in this impure sea. 



