On the Montiniliporoids of the Cincinnati Group. i 73 



16. M. DELICATULA, NicholsOll. 



ChcBtetes delicatulus, Nich. Pal. of Ohio, II., 199, 1875. 



ChcBtetes (?) minuti/s, U. P. James. The Pal^ont, p. 20, 

 1879. 



Corallum dendroid, slender and delicate, stem simple or 

 branched, from one fourth to one-half, and rarely two-thirds of a 

 line in diameter; branches cylindrical, sometimes terminating in 

 thickened, rounded extremities, and sometimes appearing to spring 

 from a horizontal footstalk; branching dichotomously, at acute 

 angles. Surface smooth. Calices of one kind only, oval, ar- 

 ranged in diagonal rows, eight in one line measured longitudinally, 

 twelve to fourteen in one line measured diagonally; openings 

 oblique to the surface, with lower lip thin and prominent. Inter- 

 stitial tubes absent. Perfect specimens show sharp spines on the 

 edges of the walls of the corallites. 



Obs. This species is mainly distinguished by its small size, 

 slender habit, the great obliquity of the tubes, and the thinness of 

 the walls. Dr. Nicholson* now regards this as a Polyzoan, but 

 as it has been described as a Monticuliporoid, we have thought it' 

 best to insert the descrii)tion here. 



Formation and Locality : Lower Silurian, Cincinnati Group, 

 Oxford, and different localities in Warren and Clinton Counties, 

 O. The form described as minutus in the lower beds at Cincinnati 

 and in Clermont County. 



17. M. GRACILIS, U. P. James. 



Monticiilipora [Heterotfypa) gracilis, James. Nich. Gen. Montic, 

 125, 1881. 



Chcetetes gracilis, James. Named but not figured or described, 

 Cat. FobS. Cin. Gr., 1871. Nicholson, Quart. Jour. Geol. Soc, 

 XXX., 504, 1874; Pal. of Ohio, IL, 198, 1875; Ann. and Mag. 

 Nat. Hist. ser. 4, XXYIII, 90, 1876. 



Batostomella gracilis, Ulrich. Jour. Cin. S. Nat. Hist , VI., 83, 

 1883; 14th Ann Rept. Geol. and Nat. Hist. Surv. of Minn. 103, 

 1886. 



Corallum dendroid, branches cylindrical or sub-cylindrical, 

 from less than one line to three lines or more in diameter, branch- 

 ing at intervals. Surface smooth. Calices oval, their long axes 

 corresponding with the long way of the branch, openmg obliquely. 

 Cell mouths greatly thickened. Interstitial tubes moderate in 



*Genus Monticulipora p. i6. 



