158 Chicirina/i Society of Xatural History. 



Corallum rounded or irregularly spheroidal, generalh- i to 

 xYz inches in diameter, and sometimes growing around the 

 stem of a crinoid ; calices not observed on the exterior ; coral- 

 lites resembling the type {undulata) thin walled, prismatic, 

 with occasional smaller cells placed at the angles ; tabulae few 

 and remote. (See Nicholson, Genus Montic, 1879, p. 173.) 



Locality. — Hudson River group of various places in Ontario. 



Remarks. — In a previous paper by the author in connection 

 with U. P. Janies^'- this variety was considered the same as M. 

 tnrhinata, James. It seems evident now that this disposition 

 is not a tenable one. It differs greatly externally from M. 

 undulata, and resembles M. tnrhinata. Internally it resembles 

 the former and differs from the latter. The figure is copied 

 from Dr. Nicholson's monograph. 



2. — M. Ti'KHixATA, V . P. James, 1.S78. 



Corallum free, forming globular, pear-shaped or irregularly 

 rounded masses, from one quarter of an inch to an inch or 

 more in diameter ; surface smooth ; calices polygonal or sub- 

 circular, sub-equal, sometimes larger at the base; macuke 

 consisting of groups of six or more slightly larger calices 

 scattered over, and only a little or not all raised above the 

 surface ; a few minute tubes wedged in at the angles of 

 junction of some of the larger tubes ; walls shown, in frac- 

 tured specimens, to be strongly wrinkled ; tabuke few in 

 number. (The Palaeontologist, No. 2, Sept. 14, 1878, p. 11.) 

 {Clucleles subjs^lobosa, Ulrich, Jour. Cin. Soc. Nat. Hist , (Feb., 

 i«8o,) vol. 2, p. 129.) 



Locality. — Cincinnati and Hatavia, Ohio, and Covington, 

 Kentucky. 



Remarks. — As noted in a previous paperi' this species was 

 described in 1878 as C/ieetctcs tin binatiim. Sub.sequently 

 (February, 1880), Mr. Ulrich's name of C. sit/>i^lo6osus was 

 published. It is an obvious synoym of the present .species. 



3. — M. i-ii.iA^A, I)'()rl)igny, 1850. 



" Corallum mainl>- fixed on shells, the surface very strongly 

 convex, presenting small, round monticules, sub conical, a few 



^Jour. Cin. Soc. Nat. Hist., vol. m, p. i6i. 

 tjour. Cin. Soc. Nat. Hi.st.. vol. lo, p. i6i. 



