SHUMARD — CATALOGUE OF PALAEOZOIC FOSSILS. 361 



CTENOCRINUS, Bronn (continued). 



lajvis— Cytocrinus lavis, Boemer, 18G0. Sil. Faun. West. Tenn., 

 taf. iv., p. 40., fig. 2. — Niag. — Decatur Co., Tennessee ; 

 Bear Grass Creek, near Louisville, Kentucky. 



ornatus — Macrostylocrinus ornaivs, Hall, 1852. Pal. New York, 

 vol. ii., p. 204, pi. 46, fig. 4.— Mag.— Lockport, N. York. 



striatus— Macrostylocrinus striaivs, Hall, 1803. Trans. Alb. Inst., 

 vol. iv., p. 207. — Niag. — Waldron, Indiana. 



CUPELLJ£CRINUS,H (Subgenus of Platycrinus), Troost, 1850. 



List Crin. Tenn. in Proc. Amer. Assoc. Camb. Meet., p. CI. 



— Platycrinus, Rcem., 1860. Sil. Faun. West. Tenn.. p. 35. 

 Bucbii,* Troost, 1850. List Crin. Tenn.— Niag.— Decatur Co., 



Tennessee, 

 corrugatus,* Troost, 1850. List Crin. Tenn. — Niag. — Decatur 



Co., Tennessee, 

 infiatus,* Troost, 1850. List Crin. Tenn.— Niag.— Decatur Co., 



Tennessee, 

 kevis,* Troost, 1850. List Crin. Tenn. — Niag. — Decatur Co., 



Tennessee, 

 magnificus,* Troost, 1850. List Crin. Tenn.— Niag. — Decatur 



Co., Tennessee, 

 pentagonalis,* Troost, 1850. List Crin. Tenn.— Niag.— Decatur 



Co., Tennessee. 

 rosEeformis,* Troost, 1850. List Crin. Tenn.— Niag. — Decatur 



Co., Tennessee, 

 stellatus,* Troost, 1850. List Crin. Tenn.— Niag.— Decatur Co., 



Tennessee. 



cal with Macrostylocrinus and Cytocrinus, though the exterior character is 

 very distinctive;" he, however, preserves the name of Macrostylocrinus for 

 a species the description of which immediately follows. Believing that the 

 surface characters given are merely of specific importance, we take the 

 liberty of grouping this, as well as other species of Macrostylocrinus, in 

 Bronn's genus, which has priority. 



II The name Cupellcecrinus was published by Dr. Troost in his List of 

 Crinoidea of Tennessee in 1850. It was applied by him to a group of Crm- 

 oids obtained by him from the Upper Silurian strata of Perry (now Deca- 

 tur) County. Tennessee, where they occur in considerable numbers. The 

 subgenus exhibits the following structure : 



Basals, 3. 



Badials, 2x5: first series large; second series rudimentary and oc- 

 cupying a small depression in the upper margin of 

 the large radial. 



Interradials, 5 large. , 



Arms, 10 (at origin), arising directly from the upper straight 



margin of the large radials. 

 It will be observed from the above formula that Cupellaicrinus presents 

 considerable analogy with Platycrinus, to which genus Dr. Ecemer has re- 

 ferred a species of this group from the glades of Decatur County, Tenn. 

 The differences consist in the rudimentary form of the 2d radials in Cupel- 

 lcecrinus which are not brachial-bearing as in Platycrinus, the brachials 

 bein<* supported almost entirely upon the superior straight edges of the 

 large 1st radials. Prof. Troost indicated by name a number of species as 

 appertaining to this group, one of which has since been described by Dr. 

 Kcemer under the name of Platycrinus Tennesscensis. 



