58 PALAEONTOLOGY. 



Fig. 1 of plate 5 represents another coral from the Carboniferous 

 limestone of Pinon Mountains, with rather more closely arranged septa. 

 It may bo a ZapJircntis or a Campopliylhmi. Only undeterminable fragments 

 of it have been seen. 



Locality and position. — Diamond Range, near Newark ; Carboniferous. 



Genus LITIIOSTROTION, Fleming. 

 LiTHOSTKOTiON Whitneyi, Meek. 



Plate 6, fig.s. 1, 1 n, 1 ft, 1 c. 



Lilhostrotion Whitneyi, Meek. (M. S.), White (1875), Piil^ont. of Lieut. Wheeler's 

 Keport, 103, pi. VI, figs. 1 a, b, c. 



Corallum dendroid or growing in irregular, loosely-aggregated tufts. 

 Corallites cylindiical, of unequal size, and separated by very unequal 

 spaces, often widely divergent, and generally a little flexuous, sometimes 

 slightly adherent where in contact; young branches rather strongly diverg- 

 ing from the larger at their origin, but soon curving so as to become more 

 nearly parallel; epitheca well developed, and only showing faintly-marked 

 septal costse, and moderately distinct wrinkles of growth. Calices rather 

 deep, nearly or quite circular, with a prominent, strongly-compressed colu- 

 mella rising in the middle; principal series of septa twenty-four to about 

 thirty-three, extending inward, sometimes nearly to the columella, but often 

 only as raised lines on the upper sides of the tabulae along the inner half, 

 though in otlier examples apparently becoming obsolete within, so as to 

 leave a comparatively large space of the tabulai smooth around the colu- 

 mella; secondary series of septa alternating with the others (with which 

 they agree in number), and very short, or not extending inward beyond the 

 very naiTow outer vesicular zone. Outer zone well defined, and so narrow 

 as to be occupied by scarcely more than a single series of small vesicles 

 that range very obliquely outward and upward. Tabula3 of inner area 

 very thin, rather closely an-anged, and curving strongly upward around the 

 columella, then extending at first nearly horizontally outward, and occa- 

 sionally dividing as they slope or curve a little downward in approaching 

 the outer zone. 



Diameter of tlie largest corallites, 0.30 to 0.40 inch: of the smallest, 



