Ilaiiiilton Group 



Hederella magj^a, n. sp. 

 The lateral tubes are frequently regularly arranged, but often 

 otherwise, diameter 1.25 mm. ; length 2 mm.; near the end the cell 

 turns upward, and the circular and slightly expanded aperture is par- 

 allel with the axis of the branch. The surface is marked by fine 

 transverse striae, and irequently by strong annulations. This spe- 

 cies can easily be distinguished from all othei forms by its much 

 larger sizCo 



Locality — York, No Y. 



PTILIONELLA, nov, gen. 



Bryozoum parasitic, procumbent, attached along its entire length ; 

 ramose; branches at irregular intervals; cells tubular, subcylindrical; 

 the attached portion flat, the free portion round; cells on each side of 

 the rachis contiguous, but not coalescing. 



Ptilionella conferta, n. sp. 

 Width of cell at base .25 mm., increasing to .50 mm. ; cells in con- 

 tact nearly their entire length; transverse section oval; aperture 

 slightly elevated, circular, opening directly outward; surface with aii- 

 liuiations, and with fine distinct longitudinal striations. 



Locality — Darieu, N. Y. 



Ptilionella pen'niformis, n. sp. 

 Width of cells at base .25 mm., increasing to .06 mm.; cells on 

 each side of rachis contiguous, but not coalescing; the end of each 

 cell-tube projecting beyond the previous cell gives a serrate appear- 

 ance to the frond, tubes strongly annulated ; apparently angular. 

 Where the annulations have the appearance of nodes the tubes 

 are not angular. 



I^ocality — Cazenovia, N. Y. 



PtILIO?s"ELLA nod ATA, 11. Sp. 



Diameter of cell-tubes at base .25 mm., enlarging to 75 mm.; in 

 contact with each other nearly their entire length, and frequently coa- 

 lescing; each succeeding cell projects beyond the preceding about .80 

 mm.; length of cell-tube nearly 4 mm.; tubes very strongly annu- 

 lated or nodose; sometimes the annulations extend across the cell- 

 tube, but usually there is a strong line of nodes on each side, some- 

 times coalescing with similar nodes on adjoining tubes, the apertures 



