32 rALiEO:s'TOLC)GY. 



The specimen referred to the above species seems to agree well with 

 the published figures and descriptions of that form. Its outer walls, as 

 seen in transverse sections, are perhaps a little thinner, and its septa slightly 

 more rigid or less curved, than represented in Edwards and Haime's enlarged 

 figure of Goldfuss' species ; but, unless better specimens than that I have 

 seen might reveal some other characters than those observed, I cannot see how 

 it can be separated from the European form. 



It has much smaller corallites than any other species of the genus 

 known to me from American rocks. 



Locality and position. — Treasure Hill, Nevada; silver-bearing Devonian 

 beds. 



Genus SMITHIA, E. & H. 



Smithia Hennahii, Lonsdale (sp.). 



Plate 2, fig. 6, 6 a. 



-• Astrcea Eennalm (pars), Lousd. (1840), in Sedgwick and Murcbison, Geol. Trans., 3d 

 ser., V, 697, pi. 58, fig. 3.— Phillips (1841), Palseozoic Foss., 12, pi. 6, fig. 16. 

 Cyathophyllum Eennahii, Bronn (1848), Index Palseont., I, 368. 

 Lithostrotion Hennalin and Actinocyatlms Eennahii, d'Orbiguy (1850), Prodr.de Pal6ont., 



I, 106 and 107. 

 Phillipsastrea Eennahii (pars). d'Orbigny (1850), ib., 107. 

 ^Smithia Eennahii, Edwards and Elaime (1851), Polyp. Foss. des Terr. Paleoz., 421; 

 Brit. Foss., Corals, 240, pi. 54, fig. 4.— Edwards (I860), Hist. Corall., Ill, 413. 

 i/ Arachnophyllum Eennahii, McCoy (1851), Brit. Palaeoz. Foss., 72. 

 i/-Acervularia seriaca, Quenstedt (1852), Handb. der Petrel'., 664, pi. 60, fig. 3. 



Corallum apparently subhemi spherical in general form. Mural circles 

 from twice to about four times their own diameter apart, but irregularly 

 aiTanged ; as seen in a transverse section, moderately well defined. Septa 

 twenty-three to twenty-six, very thin excepting near the mural circles, where 

 they are somewhat thickened, and eveVy alternate one terminates, while the 

 others continue straight inAvard nearly to the center; all more extended, 

 straighter, and more directly confluent in one direction (usually outward 

 toward the periphery of the corallum) than transversely to the same; in 

 which latter direction they are variously curved, or more or less abruptly 

 geniculated. Vertical section showing the vesicular dissepiments between 

 the septa to be very thin, nearly horizontal, and rather closely arranged. 



