298 E.EPOET OF THE State Geologist. 



than in the original. Comparative study of a series of speci- 

 mens, however, may prove these two types to be identical, but 

 for the present, at least, it is necessary to regard them as 

 distinct. 



Horizon. — Lower Pentamerus limestone. 



Locality. — Outlet of Skaneateles lake, I^. Y. 



Clathkodiotyon Jewetti, sp. nov. 

 Plate VI, figures 5, 6. 



Coenosteum known only as a small fragment. Latilaminate, 

 probably massive. Surface characters not known. LaminaB very 

 conspicuous in vertical section. Kadial pillars persistent through 

 one interlaminar space, usually terminating in the laminar parti- 

 tion. Tangential sections show the cut ends of the radial pillars, 

 which are apparently not connected by arm-like processes, but 

 by a continuous wall. Monticules are present, associated with 

 astrorhizse and axial tubes, but the character of the astrorhizae 

 has not been determined. The skeleton does not show the 

 " pillar and arm " structure characteristic of Actinostkoma nor 

 the reticulated skeleton common in Syeingosteoma. 



The species resembles C. striatellum^ Mcholson, in many par- 

 ticulars, but the latter is without astrorhizae, monticules, etc., 

 which form a striking feature in the Actinostromidce. It differs 

 from ^N'icholson's species, also, in the more normal radial pillars 

 and regular mesh. All the sections studied have been cut from 

 the small fragment which alone represents this species. In none 

 of them do the radial pillars extend systematically through a 

 number of interlaminar spaces; and although an apparent pro- 

 longation through two or even three such spaces may occasionally 

 be observed, the occurrence is too rare to influence the generic 

 determination of the specimen. 



Horizon. — Lower Pen tamer as limestone. 



Locality. — Cedarville, I^. Y. 



Actinostroma, Mcholson, 1886. 



ACTINOSTKOMA PiSTlGOUCHENSE. 



Ccenostroma Ristigouchense, Spencer, 1884. Bull. No. 1, Univ. State Missouri, 



p. 227. 

 Synngostroma RistigowShense, Nicholson, 1886. Pal. Soc, vol. XXXIX, 

 __^British Stromatoporoids, expl. PI. XI, figs. 11, 13. 



I 



