68 PALiEONTOLOSY OF NEW-YORK. 



103. 4. CHiETETES COLUMNARIS ( n. sp.) 



Pl. XXIII. Figs. 4, 4 a. 



Coral massive, hcmi.splierical or subglobose, consisting' of a series of parallel or diverging 

 polygonal tubes ; tubes four- or five-'sidec!, simple, without visible transverse dissepiments 

 or connecting pores ; interior of the cells apparently rugose or denticulate. 



The rugose structure within the cell probably indicates the existence of diaphragms which 

 have disappeared. The fossil, in its general form and structure, has the appearance of a 

 Favosites, from which a cursory examination would not induce us to separate it. A closer 

 examination proves that the tubes are usually four-sided, and that there are no connecting 

 pores in the wails of the cells. These characters had decided me to separate it from the 

 Genus Favosites, before knowing fully the characters on which the Genus CH.a:TETES is 

 founded. It appears referrible to the latter genus from its general similarity to some of the 

 species, the character of quadrangular cells probably being unimportant and not constsant. 

 The apparent absence of diaphragms, or transverse dissepiments, is perhaps due to their 

 subsequent destruction, or solution and removal. 



This species occurs in large massive forms of a foot or more in diameter, and I have seen 

 it only in such masses, and in fragments of similar ones. The substance of the coral is 

 usually replaced by chert or hornstone. 



Fig. 4. A fragment, of the natural size. 



Fig. 4 a. An enlarged portion, showing the general form of the tubes. 



Position and locality. Lower part of the Trenton limestone. Sugar River, Lewis county. 



104. 1. RECEPTACULITES NEPTUNIH 



Pl. XXIV. Figs. 3 a, b, c, d. 



jReceptaniUtes JVeptunii. De Fhance, Diet, des Sci. Nat., Tom. 45, p. 5. 



— — Blainville, Man. D'Actinologie, pag. 572 ; atlas, pl. C. fig. 1 a, *, f, d. 



Sultorljicular or hemispherical, depressed in the centre ; surface presenting a series of 

 quadrangular cells, within each of which is a vertical cylindric tube opening upwards ; 

 openings of the tubes not entirely circular. 



This fossil, which is apparently identical with the one described by De France, and 

 figured in Rlainville's Manuel d'Jlciinologie, occurs in oval or suborbicular forms some- 

 wlirit depressed in the centre. The upper smfacc presents a series of ([uadrangular openings 

 made by the intersection of vertical lamella;, whifiji cross each other in the direction of 

 curved lines, like the peripherics of a series of circles of diflerent diameters having distant 

 centres. An examination, by grinding down the surface of these quadrangular openings, 

 shows that the centre is occupied by a circular tube. These tubes radiate from the base, 

 and gradually assume a vertical position in ascending. They jJresent no marks of vertical 



