156 



Bryozoans of the 



Stictopora oyatipora, n. sj). 

 Bifurcations occurring at intervals of from five to seven mm. ; width 

 of branches, three mm. ; margins parallel, slightly obtuse, non-cellu- 

 liferous margins, .45 mm. in width; cell-apertures oval, length, .33 

 mm., arranged in longitudinal rows, margins distinctly and equally 

 elevated, ranges separated by a broad, rounded ridge, higher than 

 the margins of apertures, giving to the apertures the appearance of 

 being situated in a channel ; interior of stipe vesiculose. 



Locality — Falls of the Ohio river. 



Stictopora semistriata, n. sp. 

 Bifurcations occurring at intervals of from eight to eleven mm., 

 diverging at an angle of from sixty to ninety degrees, width from three 

 to four mm., greatest thickness, .38 mm.; margins thin, sharp, non- 

 celluliferous margin, .50 mm. in width ; apertures circular, diameter 

 .22 mm. ; on a portion of the frond irregularly arranged, on other 

 portions in longitudinal rows, separated by a ridge. The margins of 

 the branches are more nearly parallel than those of P. gilberti ; and 

 the stipe thinner. 



Locality — ^^ear Leroy, Genesee county, IS". Y. 



Stictopora fruticosa, n. sp. 

 Bifurcations occurring at intervals of from three to ten mm. ? 

 branches diverging at an angle of 45 degrees, width 2.50 mm.: non- 

 celluliferous margin, .35 mm. in width ; cell-apertures .50 mm. in 

 length, arranged in longitudinal parallel rows, from six to eight rows 

 on a branch, margins slightly elevated, granulose, space between rows 

 elevated, with obscure granulose striations. The appearance of the 

 species varies greatly, accroding to the degree of weathering. 



Locality — New York. 



Stictopora rigida, n. sp. 

 Bifurcations occurring at intervals of from four to fifteen mm. ; 

 width of branches from two to three mm. ; margins parallel ; greatest 

 thickness .50 mm. , width of non-celluliferous marginal space, .25 

 mm. , cell-apertures oval, length ,25 mm., twelve apertures in the 

 space of five mm., distinctly arranged in longitudinal rows, sepa- 

 rated by a strong, angular, finely striated ridge; transverse space 

 between the apertures flat, obscurely striated ; margins thin, equally 

 elevated. 



Locality — Near Leroy, Genesee county, N. Y, 



