266 W. H. SHEKZER — THE CENTJS CHONOPHYLLUM. 



museum of the university of Michigan. It has a height of 10 cm and a 

 diameter at the broadest part of 7 cm. In its general structure and ex- 

 terna] appearance it suggests the specimen of Edwards and Haime. On 

 closer study, however, it is found to possess all the essential characters of 

 Cyathophyllum helianthoides, Goldf., some abnormal growths of which are 

 figured from the same locality by Goldfuss.* The septa are lamellar, and 

 are angular or " roof-shaped " in the outer area, polished sections show- 

 ing the structure to be afterward described as peculiar to this form. 

 Several buds have started in the outer area which show the character- 

 istic reflexed growth and the compound tendency of the coral. 



2. Chonophyllum elongatum, Edwards and Haime. 



Chonophyllum elongatum, Edwards and Haime. Pol. Foss. des Terr. Pal., 



1851, p. 406, pi. viii, tigs. 1, la. 

 " " Milne-Edwards. Hist. Nat. des Cor., vol. iii, 



i860, p. 399. 



Under this name Edwards and Haime described a second species in 

 1851 as follows : 



"Conallum elongated, cylindro-turbinate, straight or very feebly curved, present- 

 ing a great number of projecting swellings and interruptions in the continuity. 

 Epitheca well developed ; the exterior portions of the corallum sub vesicular. Calyx 

 moderately deep. 74 to 76 septa, very slender and equal. Height 7 to 8 cm; diam- 

 eter of calyx, 2to3. Devonian, Fiance ; Nehou (Manche). Collection of Verneuil." 



Their figure 1 shows a slender, cylindrical coral, apparently made up of 

 a series of invaginated cell-cups, the irregularities of which give exteriorly 

 a sul (vesicular, roughened appearance, la is a view of an enlarged 

 calyx, showing the septa angular in the outer area, as is seen in Omphyma 

 and Ptychophyllum. The general shape and structure of this specimen 

 and the thin angular septa certainly remove it from the forms which we 

 have grouped about C. magnificum. It was stated by the founders to 

 differ from C. perfoliatum by its more elongated, slender form and more 

 infundibuliform tabulse.f 



3. Chonophyllwn iiiagarense, Hall, sp. 



Conophyllum niagarense, Hall. Pal. of X. Y., vol. ii. 1852, pi. xxxii. ftgs. 



4 (i-ii. 



Cystiphyllum ni<t</<tr< i iis<\ Rominger. (ieol. Surv. of Mich., vol. iii, pt. ii, 



1876, p. 138, pi. xlix, fig. 3. 



* Loc. ''it., tali. xx. 



fBrit. Foss. Cor., pt. iv, ]> 235. 



