110 Twenty-sixth Report on the State Museum. 



Yermipora serpuloides n, sp. 

 Bryozoiim growing in strong ramose branches, with widely-diverg- 

 ing bifurcations : branches often one-fourth of an inch in diameter, 

 rapidly decreasing in size at the bifurcations, composed of long, 

 slender tubes, which gradually diverge from the axis to the exterior 

 of the branch. Tubes flexuose, compressed, smooth on the exterior, 

 or with corrugations of growth ; gradually increasing in size upward. 

 Apertures opening rectangularly to the axis (when entire), their 

 greatest diameter about three hundredths of an inch, and with about 

 an eighth of an inch of their length exposed, on branches which are 

 one-fourth of an inch in diameter. 



Formation and locality. — In limestone of the Lower Helderberg 

 group, at Schoharie, ISTew York. 



Genus AULOPOEA. Goldf. 



AULOPORA SCHOHARI-^ n. Sp. 



Cells tubular, elongate, cylindrical or gradually enlarging to the 

 aperture, frequently budding in a direct line, including an angle of 

 about eighty degrees, varying somewhat in different specimens: 

 apertures large, circular, opening upward, or directed slightly for- 

 ward ; walls thin, not striate within ; exterior of the tubes smooth 

 or with transverse wrinkles of growth. Length of cell tubes about 

 one-fourth of an inch; diameter of aperture five-hundredths of an 

 inch ; greatest diameter of tube one-third greater than that of the 

 cell apertures ; diameter of the posterior extremity of tube equal to 

 one-half that of the aperture. 



This species is much smaller than that in the ' Hamilton group 

 referred to A. tuhceformis Gold. ; it corresponds more nearly in 

 size to A. serpens var. minor Gold., in Petref. Germ., p. 82, pi. 29, 

 f. 1 b. ; but is larger than the figure ; the extremities of the tubes 

 are more unequal, and the mode of growth and bifurcation differ. 



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

 Helderberg group, at Schoharie, New York. 



Genus CH^TETES Fischer. 



Ch^tetes Helderbergi^ n. sp. 

 Bryozoum growing in strong, ramose branches, or palmate fronds ; 

 the diameter of the branches sometimes five-eighthS of an inch, and 



