156 Cinciiuiati Society of Natural History. 



larger ones, and sometimes so numerous as to completely 

 isolate the large tubes from one another (in sub-genus Fistuli- 

 foka) ; the apertures of the cells generally straight, sometimes 

 more or less oblique, varying in sha])e from circular, oval, 

 hexagonal or polygonal, to square or rhombic ; surface often 

 showing at intervals areas occupied by corallites larger or 

 smaller than the average ; if elevated above the surface 

 known as " monticules," and if on or below it, as " macukc ;" 

 sometimes forming (in sub-genus Constellaria), star- 

 shaped elevations, more or less thickly scattered over the 

 surface ; spiniform corallites more or less numerous, placed 

 either at the angles, on the edges of the cells, or, at times, 

 projecting into the cell cavity : sometimes (in sub-genus Dkka- 

 via), projecting above the surface as conspicuous blunt spines. 

 (Prodrome de Paleont , tome i, 1850, p. 25; Nicholson, Pal. 

 Tab. Corals, 1S79, p. 269; The Genus Montic, 1.S81, p. 30 

 <"/ scq.) 



Remarks. — The above description has been purposely made 

 broad enough to cover the many genera that have, from time 

 to time, been published. The reasons for this are more fully 

 set forth in another place,* to which the student is referred. 

 Attention is also called to Nicholson's " The Genus Monticu- 

 lipora " for a very full exposition of the features of the genus 

 and descriptions of many species. In the references to the 

 species given below, generally only the original place of pub- 

 lication will be cited. 



The genus is divided into six groups, founded on the exter- 

 nal form of the corallum. While this may be considered an 

 artificial arrangement, it is, at the same time, believed to be 

 one more useful to the student than what might be termed a 

 natural arrangement based upon internal structure. The 

 groups are: I. Massive; II. Discoid: III. Dendroid or Ra- 

 mose ; W . Laminar ox Frondesceui : \. Incrnstim^ or Para- 

 sitic ; VI. vSpecies imitating foreign bodies. Ptach of these 

 groups will be separately considered. 



*Oii the MoiiliciiliporoidiCoials of the Cincinnati C.roMp, wilh a critical revision 

 of the species. By V. V. James and Joseph F. Jame.s. Jour. Cin. Soc. Nat. Hist., 

 vol. 10, pp. 118-141. 



