104 Twenty-sixth Report on the State Museum. 



in diameter from two-hundredths of an inch, to, rarely, a sixteenth of 

 an inch. 



In some well preserved examples of evenly weathered specimens 

 a narrow groove or channel is seen passing from the upper and lower 

 angle of the cells on to the surface, nearly uniting with that from the 

 cells above and below, which may sometimes pass entirely over, leav- 

 ing a double carina between the lines of pores ; but this feature has 

 been seldom observed. 



This species is closely allied in some points to T, regularise with 

 which it is often associated, but differs essentially in the arrangement 

 y)i the pores; that species having pores in longitudinal lines with an 

 elevated ridge between, while in this species they are always spirally 

 arranged ; in worn specimens the difference is less distinctly seen. 



Formation and locality. — In the shaly limestones of the Lower 

 Helderberg group, near Clarksville, Albany county, and at Scho- 

 harie, ISTew York. 



Teematopoea signatus n. sp. 



Bryozoum forming slender, tortuous branches, seldom more than 

 four-hundredths of an inch in diameter; bifurcations frequent, widely 

 divergent. Surface marked by comparatively large polygonal pores, 

 rather longer than wide, with partition walls carinate on the surface 

 in unworn specimens, but frequently flattened from weathering or 

 other causes, and in this condition the pores appear circular. In 

 the angles formed by the junction of three or more pores are often 

 seen minute pits, similar in appearance to the intercellular pits in 

 Callopora, but which are probably the commencement of additional 

 pores. 



This is a clearly distinct and easily recognized species. It has 

 much the appearance of a minute species of Striatopora and the form 

 of cell apertures, their upward direction, radiating from the center of 

 the branch, their angular outline and large size, would seem to ally 

 it with that genus ; but no trace of the characteristic striae can be 

 seen. It is closely allied to T. constricta from which it can be distin- 

 guished by the larger and angular pores as well as by the numerous 

 intercellular pits of that species. 



Formation and locality. — In the shaly limestones of the Lower 

 Helderberg group, at Schoharie, New York. 



Teematopoea consteicta n. sp. 

 Bryozoum forming hollow bifurcating branches, generally about 

 an eighth of an inch in diameter, rarely nearly twice these dimen- 



