68 PALiEONTOLOOy OF NEW-YORK. 



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



Pi. XXIII. Figs. 4, 4 a. 



Coral massive, hemispherical or subglobose, consisting of a series of parallel or diverging 

 polygonal tubes ; tubes four- or five-^ided, 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 

 Fatosites, 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 walls 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^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 constant. 

 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 hornslone. 



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 NEPTUNIII 



Pl. XXIV. Figs. 3 a, ft, e, d. 



BeeeptaculUe* ^eptunii. De France, Diet, des Sci. Nat., Tom. 45, p. 5. 



— — Bl,ainvilxe, Man. D'Actinologie, pag. 672; atlas, pi. C. fig. 1 a, ft, c, d. 



Suborbicular 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 Blainville's Manuel d ^Adinologie, occurs in oval or suborbicular forms some- 

 what depressed in the centre. The upper surface presents a series of quadrangular openings 

 made by the intersection of vertical lamellae, whijJi cross each other in the direction of 

 curved lines, like the peripheries of a series of circles of different 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 present no marks of vertical 



