CORALS AND BRYOZOA. 209 



FISTULIPORA, McCoy. 1849. 



(See pages 27, 87.) 

 FiSTULIPORA LONGIMACULA. 



NOT FIQUBBD. 



Thallostigma Irnighnacula, Hall. Trans. Albany In.stitute, vol. x, p. 185. 1881. 



" " " Report of State Geologist for 1883, p. 23. 1884. 



ZoARiUM consisting of lamellate expansions, incrusting other objects, thickness 

 from .50 to 1.50 mm.; no masses formed by the accretion of successive layers 

 of growth, have been observed. Cells tubular, round or sub-angular, oblique 

 or rectangular to the surface ; septa infrequent or entirely wanting. Inter- 

 cellular space vesiculose ; near the base the vesicles are irregularly disposed, 

 and more regularly superimposed above, giving the appearance of septate 

 tubuli ; septa numerous, fifteen or twenty in the space of 5 mm. Cell aper- 

 tures oval or trilobate, frequently sub-quadrangular, length a little more than 

 .20 mm., width about two-thirds the length, regularly and irregularly dis- 

 po.sed, comparatively distant. Peristomes thin, sometimes equally elevated, 

 at other times the posterior portion is the more strongly elevated and has 

 occasionally two slight denticulations. Mesopores variable in size, frequently 

 larger than the cell apertures ; margins slightly elevated, smooth. Surface 

 marked by low, elongate monticules, at the middle of each there being a com- 

 paratively deep depression, having a length of between 3 and 4 mm., and a 

 widtli of little less than 1 mm., destitute of cell apertures and occupied by 

 mesopores; the adjacent apertures are larger than the others and radiate 

 from the depressions in straight lines, forming elevated rows, gradually grow- 

 ing smaller as they recede. The cell apertures on the other portions of the 

 frond are irregularly disposed. 



The cell apertures in size and shape resemble those of Lichmalia cultellata, but 

 this species will be easily distinguished from that one by the elongate monticules 

 with depressed centers, and the presence of mesopores ; these features will dis- 

 tinguish it from any other species at present known, from this geological 

 formation. 



Formation and locality. Hamilton group, York, Livingston county, N. Y. 



