148 Thirtf-second Report on the State Museum. 



CELETETES, Fischer. 

 Ch^tetes monticulatus, n. sp. 



(PLATE VIII, FIGS. 5-7.) 



Corallum forming spheroidal masses. Cell-tubes small, polygonal, .35 mm. 

 in diameter at aperture ; cell-walls thin, strongly corrugated ; transverse parti- 

 tions slightly thinner than the cell- walls, occurring at irregular intervals, varying 

 from .35 mm. to eight mm. or even more ; surface having frequent strongly ele- 

 vated nodes, with cells of the same size as on other parts of the surface, arranged 

 in intersecting rows. 



This species in general appearance is similar to C. colliculatus, but may be 

 distinguished from that species by its smaller cell-tubes, more numerous nodes, 

 spheroidal form and difference in septa. 



Formation and locality. Lower Helderberg group, Schoharie, N. Y. 



Ch^ITETES COLLICULATUS, n. sp. 



(PLATE VIII, FIGS, l^t.) 



Corallum hemispheric, base flat or concave, covered by a wrinkled epitheca. 

 Cell-tubes polygonal, nearly .5 mm. in diameter at the aperture ; surface having 

 frequent strongly elevated nodes, with cells about the same size as the others ; 

 septa thin and infrequent. 



This species differs from C. monticulatus in form and in the size of cells. 

 Formation and locality. Lower Helderberg group, Schoharie, N. Y. 



Ch^tetes fruticosus, n. sp. 



(PLATE IX, FIGS. 1-8.) 



Corallum ramose, solid; branches slender, frequent; diameter generally from 

 two to two and one-half mm. ; cell-tubes polygonal, arising from the centre of 

 the branch, and very gradually diverging to the surface ; opening very slightly 

 oblique to the surface ; five mm. or more in length ; diameter less than .25 mm. ; 

 cell-tubes thin, apparently slightly corrugated transversely; septa thin, and 

 very infrequent. 



This species can be distinguished from C. abruptus, plate ix, figs. 9-11, by 

 its more slender branches, which character seems to be constant, but especially 

 by the manner in which the tubes approach the surface, the thinner and more 

 infrequent septa. 



Formation and locality. Lower Helderberg group, Schoharie, N. Y. 



Chjetetes abruptus, n. sp. 



(PLATE IX, FIGS. 9-11.) 



Corallum ramose, solid ; branches frequent ; cell-tubes polygonal, small, arising 

 from the centre of the branch, and gradually diverging till within about two mm. 



