194 



Bryozoans of the 



ACROGENIA PKOLIFEKA, H. SJ). 



Width of branch 2 to 3 mm. ; greatest thickness .15 mm.; cell- 

 apertures parallel or oblique to the base, circular or oval, diameter 

 Varying from .20 to .50 mm ; when oblique to the surface, the lower 

 portion of the margin is most elevated, the apertures appearing as a 

 succession of loops; the rows are separated by continuous ridges, the 

 central ridge much stronger than the others. 



Locality — Bcllonn, N. Y. 



GENUS HEDERELLA, nov. ge7i. 



Bryozoum consisting of a filiform axis with opposite or alternate 

 lateral budding of simple tubular cells, or of lateral extensions having 

 the same mode of growth as the original, 



Hederella cirrhosa, n. sp, 



A filiform tube, from which proceed laterally simple tubular cells, 

 and at irregular distances tubular extensions, whose manner of growth 

 is the same as that of the main tube ; parasitic, procumbent, attached 

 for their entire length ; diameter .20 mm.; the lateral cells generally al- 

 ternate and are distant from each other on the same side of the branch 

 2.50 mm.; before ceasing growth they turn abruptly outward ; tubes 

 transversely annulatedo 



Locality — York, N. Y 



- Hederella canadensis, JVwJi, sp 



Aulopora canadensis. Nicli. Pal. Prov. of OntariO; 1874. Alecto canadensis. 

 Nicli Canadian Naturalist. Yol. 7, No. 3. 



Lateral tubes have a length of 1.50 mm.; they are quite regularly 

 arranged, and are distant from each other on the same side of the 

 branch 1.50 mm. ; cell for the greater portion of its length of the same 

 size., diameter .50 mm, surface marked by strong transverse annula- 

 tions and fine striae. 



Locality — York, N. Y. 



Hederella filiformis„ 



Aulopora fiUf or mis, Billings^ Canadian Journal, New Series, Vol. 4, p 119 

 This species differs from all others of the genus in the compact ar- 

 rangement of the cells. It may be very easily distinguished from H. 

 cirrhosa by its large size ; from JET. canadensis by its larger size, and 

 from the fact that the lateral cells are parallel to and in contact with 

 the main axis for their entire length; from H. magna from its much 

 smaller size. 



Locality— York^ N Y. 



