154 



Bryozoans of the 



LlCHENALIA PIRIFORMIS, n. Sp. 



Lamellate ; cells tubular, on a large portiou of the frond very ob- 

 lique in their entire length, on the remaining portion oblique a 

 part of their length, then turning abruptly outward ; diameter of 

 aperture .35 mm., when oblique the upper portion of the wall is 

 exposed from .50 to .73 mm., the edges denticulated ; looking per- 

 pendicularly on the frond, the margins and cell walls are pear 

 shaped, as seen obliquely across che frond, the cell walls and projec- 

 tions resemble strong spines ; maculse distant about six mm., elevated 

 cells of ihe centers confused; intercellular surface crowded with small 

 spines; intercellular space of the interior occupied by large and irregu- 

 larly disposed vesicles; the denticulations are formed by the projec- 

 tion of two striae, situated near together and continuing the entire 

 length of the interior of the cell tube. 



Locality — Falls of the Ohio river. 



GENUS LICHEJSrALlA. 

 Subgenus phractopora, n. s. gen. 

 The manner of growth is essentially the same as that of Lichen- 

 alia, the surface is raised at irregular intervals into elevated crests, 

 which are celluliferous on both sides ; cells arising from a mesial epi- 

 theca, the crests unite leaving irregular cavities between them. 



Phractopora cristata, n. sj:). 



Lamellate; crests sometimes attaining a height of seven mm., base 

 from one to two mm. thick, gradually growing thinner, summit sharp, 

 noncclluliferous; at the middle of each crest is a ti'iangular noncel- 

 luliferous space 'two mm. wide and three long; the portion of the 

 frond from which the crests arise celluliferous on one side only ; 

 cells cylindrical, closely disposed, alternating and imbricating, diame- 

 ter of aperture ,25 mm., margins unequally elevated, one portion pro- 

 jecting over and constricting the aperture ; maculse numerous, slightly 

 elevated ; interior intercellular space vesiculose. 



Locality — Falls of the Ohio river. 



THALLOSTIOMA, nov. gen. 



Bryozoum consisting of broad foliate expansions similar to LiCH- 

 Ei^ALiA, but with the intercellular space punctate upon the surface. 



Thallostigma intercellata, n. sp. 

 Lamellate; cell-apertures circular or slightly oval, diameter .25 mm., 

 irregularly and closely disposed, margins elevated, having from one to 



