Tropidoleptus Fauna at Canandaigua Lake, N. Y. 159 



This species is very rare in the present collection. It is common 

 in the Demissa bed at Eighteen Mile Creek, but is not reported in the 

 other sections under consideration. 



Spirorbis spinuliferiis Nich. 

 Pal. Prov. Ont., p. 83, 1875. 



This species, which has not been reported from the other sections, 

 is extremely abundant at Canandaigua Lake in this faunule, and seems 

 to take the place of S. angitlatus. 



Cormilitcs Iiamiltonice Grabau. 



Bull. Buffalo Soc. Nat. Sci., Vol. VI, 1898-99, p. 150, fig. 32. 



This species, which is found in the Pleurodictyon beds at Eighteen 

 Mile Creek, is fairly common at our locality. 



Cor nil lit es sp. 



With the above is another species, probably undescribed, which 

 reaches a large size, has fewer and more irregular annulations. 



Antodetus iindsfra'?m' Clarke. 



Am. Geol., Vol. XIII, p. 334, figs. 1-3, 1894. 



This peculiar organism is quite common. The apical scar shows 

 that it attached itself to various supports. The only specimen which 

 remains in its attached position is resting upon a frond of Ttrniopora 

 exigi/a. Some species show a broad flat surface for attachment, as 

 much as one half the width of the body whorl, while in others it is 

 small, and often concave. This species also occurs rarely in the 

 lower beds at Eighteen Mile Creek. 



Aiitodctes sp. 



With the above occurs another form of the same genus, which is 

 sufficiently unlike A. lindstra'mi to be called by another specific name. 

 It is rare. 



Bryozoa. 



Ascodictyum stellatiim N. &: E. 



Am. Mag. Nat. Hist., Ser. 4, XIX, p. 464, pi. XIX, figs. 1-6. 

 This little bryozoan is very common in the material, usually occur- 

 ring attached to brachiopods or bryozoans. 

 Finacotrypa plana Hall. 



Pal. N. ¥., Vol. VI, p. 215, pi. VIII, pp. 19, 20. 

 This species is quite common at Canandaigua Lake. It is found 

 rarely in the lower Hamilton at Eighteen Mile Creek, but has not 

 been rejjorted from the other sections. 

 II 



