162 



Bryozoans of ihe 



CLONOPORA, nov. gen. 

 Bryozonm consisting of an aggregation of elongate cylindrical 

 tubnlar cells, which at more or less regular intervals become entirely 

 free and turn abruptly outwards in an umbelliform expansion or in 

 alternation ; cell apertures expanded or narrowly trumpet-shaped. 



Olonopora semireducta, n. sjj. 



Ramose ; diameter of branches one mm., composed of an aggrega- 

 tion of tubular cells, commencing at the axis of the branch, essen- 

 tially parallel with the axis till within about one mm. from the aper- 

 ture, when they turn abruptly and continue at right angles to the 

 previous portion, length 2.50 mm.; some of the specimens consist 

 simply of an aggregation of cell-tubes, but some others have appa- 

 rently an intercellular substance. 



Locality — Falls of the Ohio river. 



Clonopora incurva, n. sp. 



Consisting of an aggregation of cylindrical tubular cells which 

 gradually increase in size to the aperture, eight or ten tubes com- 

 mencing growth at the same point; at a distance of 1.50 mm. from 

 the aperture, the tube turns quite abruptly and continues at nearly 

 right angles to the former portion ; the apertures are spirally arranged; 

 the group of cells being umbel-like, and the bryozoum consisting of 

 a succession of the umbelliform groups of cell-tubes. 



Locality — Manlius, No Y. 



CRISINA, d'OrUgny. 



CrISINA ? SCROBICULATA, 11. Sp. 



Branches frequent; transverse section oval; celluliferous on one 

 side ; apertures small, circular, arranged in oblique ascendant rows 

 from the middle of the branch, the two series of rows alternating, 

 prominent, elevated, extending beyond the side of the branch; aper- 

 tures .25 mm. in diameter, intercellular space occupied by polygonal' 

 pits ; non-celluliferous side finely and irregularly striated 



Locality — New York. 



FENESTELLA [Miller), Lonsdale. 

 Fekestella cultellata, n. sp. 

 Infundibuliform with frequent elongate processes ; branches vary- 

 ing in width from .50 to 1.50mm.; on non-celluliferous side rounded 

 or subangular, oiecasionally nodose; dissepiments about .35 mm. in 



