FOSSILS OF THE HUDSON RIYEK GROUP. Ill 



FOSSILS OF THE CLINTOiN GROUP. 



BRYOZOx\. 



Genus RETErOKA, Lamarck. 

 Retepora axgulata ? Hall. 



Plate 5, figs. 2-4. 



fBetepora angulata, Hall; Pal. N. Y., Vol. II., p. 40, pi. 19, fig. 3. 



Frond densely reticulated; fenestrules elongate, sub-rhomboidal, two 

 to three times as long as wide, and pointed at the extremities, seldom 

 measuring a line in length, and many of them not more than one-third 

 of a line ; bars strongly rounded on the poriferous side, less convex and 

 finely striated longitudinally on the opposite face. Pores arranged in 

 two or more lines, usually three, but often becoming crowded and irregu- 

 larly disposed at the junction of contigaous parts, where there are often 

 as many as five in the breadth of the bar ; margins of the pores strongly 

 exsert, the lower side forming a spur-like lip in the central ranges, while 

 those of the lateral ranges have the outer lip extended and elevated, 

 bringing that side of the margin to a level with the inner margin. 



The specimens examined, although having considerable resemblance 

 to R. angulata, still differ in several important particulars, such as not 

 possessing the angular ridges between the pores, and in having the bor- 

 ders of the pores elevated, forming the spur-like projections which that 

 species does not show. We, therefore, strongly suspect that it may prove 

 to be a distinct species on the examination of other and more perfect 

 specimens, in which case we propose for it the specific name Daytonensis. 



Formation and locality: In the limestones of the Clinton groui), Soldiers' Home, 

 near Dayton, Ohio. 



