184 



Bryozoans of the 



the wall is a projection extending over and constricting the aperture, 

 maculae slightly elevated, distant 5 mm. 



Locality — Near Leroy, N Y. 



LiCHENALTA COLLICULATA, 71 Sp. 



Expansions or masses; cells tubular, cylindrical; apertures oval; 

 length .25 mm., distant from each other about equal to the length of 

 an aperture ; the surface consists of rounded elevations, 4 mm. in di- 

 ameter ; apertures arranged in rows, radiating from the centres of ele- 

 vations, sometimes indistinct, the radiating rows appearing as ridges; 

 internal intercellular tissue consisting of vesicles. 



THALLOSTIGMA,, Hall 



Thallostigma V aria pgr a, 71. sp. 



An expansion, with cell tubes at right angles to the surface ; cell 

 walls thin, septa infrequent; one-half the thickness of the cell walls, 

 four in 5 mm. ; intercellular space composed of septate tubuli; septa 

 closely arranged ; cell-apertures circular, irregularly disposed ; maculae 

 elevated, width of base G mm., the whole surface composed of these 

 elevations ; cells nearest the center large ; margins of apertures thin, 

 distinctly elevated ; intermediate space with angular pits. 



Locality— West Williams, Canada. 



Thallostigma confertipora, n. sp. 

 Expansions or masses formed by superimposition of successive 

 growths; cells cylindrical, tubular, and for the greater portion of their 

 length at right angles to the surface, diameter .33 mm., septa infre° 

 quent ; intercellular tissue composed of minute tubuli divided by 

 numerous septa ; cell-apertures circular, closely disposed maculse; ar- 

 ranged in regular intersecting rows ; margins thin, distinctly elevated, 

 spinulose. 



Locality — Moscow, N. Y. 



Thallostigma scrobiculata, n. sp. 



Expansions or masses by superimposition, cells tubular, cylindrical; 

 apertures parallel with surface, diameter .24 mm.; walls of cells 

 thin; septa infrequent; intercellular space vesiculose ; apertures of 

 tubes irregularly disposed ; margins of apertures thick, distinctly ele- 

 vated, granulose ; maculae at irregular distances, without cell-aper- 



