DEVONIAN SPECIES. ,^1 



DiphijphijUHm, it seems to me that tliere can be no reasonable doubt in regard 

 to the coral under consideration having no traces of a columella. It is true 

 that fossil corals, in different states of preservation, sometimes do present 

 quite deceptive appearances in their internal structure; but, from the exami- 

 nation of ground sections in various directions through the corallites, as well 

 as from broken specimens, showing the interior more or less distinctly, I 

 think I cannot be mistaken in the conclusion that this coral has not the 

 characters of LitJiostrotion, and agrees with Lonsdale's genus. 



Locality and position. — Argyle and Treasure Hills, AVhite Pine Mining 

 District, Nevada; Devonian. 



Genus ACERVULARIA, Schweigger. 



ACERVULARIA PENTAGONA, GoUlfnSS (SJ).). 

 Plate 2, figs. -., 5 a. 



Cyathophylbm pentaaonum, Goldf. (1820), Petref. Germ., I, CO, tab. 19, fig. 3.— Morven 



(1832), Descr. Corall. Belg., 50. 

 Favastrea pentogona, de Blainville (1830), Diet. Sei. Nat., LX, 340; Mann. d'Actiu., 375. 

 Astrea pentagona, Lonsdale (1840), Geol. Trans., 2d ser., V, pi. 57, fig. 1.— Phillips 



(1841), Palseozoic Fossils, 11, pi. 6, fig. 15. 

 Acervularia pentagona., Micbeliu (1845), Icon., 180, pi. 49, fig. 1. — McCoy (1851), Brit. 



Palaeozoic Foss., 19. — Edwards and Ilaime (1851), Polyp. Terr. Paleoz., 418; 



and Brit. Foss. Corals, 238, pi. 53, figs. 5, 5 a, 5 &.— Piclet, Traite de PaltSont., 



pi. 108, fig. 3.— Milne Edwards, Hist, des Corall., Ill, 410. 

 Acervularia ananas, Micbelin (1845), Icon., pi. 47, fig. 1. 

 Lithostrotion pentagonum, d'Orbigny (1850), Prodr. de Paleont., I, IOC). 



Corallum astreiform. Corallites comparatively small, and of rather uni- 

 form size, generally hexagonal or pentagonal; septa eighteen to twenty-four, 

 rather strong, nearly straight, half of them terminating at the inner wall, 

 while the others continue in nearly to the center; outer walls very thin, 

 minutely zigzag; inner walls moderately defined around the calicos, which 

 are of medium depth, and generally rather more than one-third as wide as 

 the corallites. Dissepiments, as seen between the walls in vertical sections, 

 very thin, rather closely arranged, and at some points slightly waved. 



Entire breadth of corallum unknown ; breadth of an imperfect mass of 

 same, 2.80 inches; breadth of corallites, aljout 0.18 inch; breadth of calices, 

 about 0.07 inch. 



