274 PALAEONTOLOGY OF NEW YORK. 



Formation and localities. Hamilton group, Eighteen-mile creek, Erie county ; 

 Lodi Landing, Seneca lake, and near the head of Canandaigua lake, Ontario 

 county, N. Y. 



THAMNISCUS, King. 1849. 



(See pages 41 and 104.) 

 TnAMNISCUS PAUCIRAMU8. 



NOT FIOURBD. 



Thamnlictus ■pauclramius, Hall. Trans. Albany Institute, vol. x, p. 197. 1S81. 

 " Report of State Geologist for 1883, p. 60. 1884. 



ZoARiUM fruticose, several stems arising from a common base, bifurcating 

 and laterally branched, celluliferous on one face ; branches occurring at inter- 

 vals of from 2.50 to 7 mm., diverging at an angle of about forty-five degrees; 

 just above a bifurcation a little less than .50 mm. in width, very gradually 

 increasing to .60 mm , sometimes of essentially the same size for nearly their 

 entire length. On the non-celluliferous face the branches are gently con- 

 vex, striated, from three to five striations on a branch, minutely granulose. 

 Cell apertures oblique, circular, or sub-polygonal from mutual pressure, 



irregularly and very closely disposed, usually in contact. 



********* 



Formation and locality. Hamilton group, Monteith's Point, west shore of Can- 

 idaigua lake, Ontario county, N. Y. 



REPTARIA, RoLLE. 1851,* 

 Reptaria stolonifera. 



PLATE LXV, FIGS. 17-19. 



Reptaria sMonif era, Rollk. Leonhai'd & IJronn. Neues Jahrbucii, p. 810, pi. ix, figs. 5, (i. 1851. 

 Ptilionella peimifonnis, Hall. Trans. Albany Institute, vol. x, ]i. 19"). ISSl. 

 " " " Report of State Geologist for 1883, p. 56. 1884. 



ZoARiuM parasitic procumbent, attached for its entire extent; consisting of a 

 rachis, from which proceed laterally, at regular intervals, simple cell tubes, 

 and, at irregular distances, tubes which have the same manner of growth as 



*I am injlebted to Mi-. John M. Clavlte for calling my attention to this genus, published in a worlc which 

 has not lieen accessible to me. 



an 



