598 Report of the State Geologist. 



immersed; arranged in a single branching series; apertures sub- 

 terminal, circular, more or less elevated, opening directly- 

 outward. 



The shape of the cells and mode of increase is the same as in 

 PjROBOsciiTA, differing from that genus only in having the cells 

 arranged in a single series, in Proboscina. the cells being arranged 

 in two or more series and more or less immersed. 



Family Entalophoridae, Reuss, 

 Clonopoba. Hall. 

 (Bryozoans of the Upper Helderberg group, p. 20. 1881.) 



Type, Clonojpora semireducta^ Hall. 



(Plate 25, figs. 6,7.) 



Zoarium ramose ; branches consisting of an aggregation of 

 elongate, cylindrical, tubular cells, which at more or less regular 

 intervals become entirely free, and turn abruptly outward in an 

 umbelliform expansion or in alternation ; cell apertures expanded. 



Cystopora, Hall. 

 (Trans. Albany Inst., YoLX, p. 161. 1881.) 



Type, Cystojpora geniculata^ Hall. 



(Plate 25, figs. 3-5.) 



Zoarium consisting of an aggregation of ampuUate, tubular 

 cells ; the greatest diameter of the cell tube being at about two- 

 thirds of its length ; near the anterior end turning abruptly out- 

 ward and much constricted at the aperture ; cell tubes exposed 

 for more than half their length, alternating, imbricating, 

 arranged in spiral rows around the branch. 



MiTocLEMA, Ulrich. 



(Jour. Cin. Soc. Nat. Hist., Yol. Y, p. 150. 1882.) 

 Type, Mitodema cinctosum, Ulrich. 



Zoarium ramose, slender ; transverse section subcircular ; cells 

 tubular ; very long ; gradually diverging in all directions from 



