366 Proceedings of the Ohio State Academy of Science. 



RHOMBOPORA ARX^ATA-UIrich. 



1884. Rhombopora aniiafa. Ulrich, Jour, Cinn. Soc. Nat. Hist., Vol. 

 VII, p. 31, pi. 1, figs. 5, oa. 

 Kaskaskia group : Tateville, Kentucky. 



Description. — Zoarinm slender, ramose, solid. Zoecia 

 with deep, narrow, rhombic vestibules, arranged regularly in a 

 quincuncial manner, thus forming vertically, transversely, and 

 obliquely intersecting series. The oblique series slightly more 

 evident. Apertiu-es subcircular and comparatively large. The 

 peripheries of the vestibules form roimded ridge-like thickenings, 



Fig. 6. — Klwmbopora aniiata. Zoarium magnified twenty times to show 

 the apertures and spines. 



and at the intersections of the oblique ones of these are located 

 one or two prominent spines. 



Zoarium i mm. in diameter; and with eleven to thirteen 

 zoecia to one circumference. 



This species can be readily recognized by its slender cylin- 

 drical zoarium with rhombic vestibules and prominent spines. 



Horizon and locality. — Maxville limestone. 

 Undetermined zone : Harper Shaft, Olive Fiu-nace. 



CLASS BRACHIOPODA. 



DERBYA CRASSA— Mcefc and Harden. 



1853. Orthis innhracuhunf Hall. Stansbury Explo. and Survey Gt. Salt 

 Lake, p. 412, pi. 3, fig. 6. 

 Carboniferous: Missouri River. 



