2o6 Cincinnati Society of Natural History. 



36. — M. NODULOSA Nicholson, 1874. 



Corallnni minute, dendroid ; stems varying from two-thirds 

 of a line to one line in diameter, branching at intervals of two 

 lines ; surface with numerous conical or transversely elongated 

 monticules ; calices oval, the long axes corresponding with 

 the long axis of the corallum, opening obliquely ; walls thick- 

 ened at the surface ; interstitial corallites numerous, nearly 

 enclosing the larger cells, angular or sub-angular ; tabulae 

 comparatively few, but increasing in numbers toward the 

 surface, always complete and approximately horizontal ; more 

 numerous and more closely set in the small than in the large 

 corallites ; in transverse sections the cells of the central 

 region have thin walls and are angular in shape ; in the other 

 portions oval and with thicker walls; each corallite is sur- 

 rounded by a distinct wall, the interspaces being occupied by 

 a well-developed series of small, more or less angular, inter- 

 stitial cells, variable in size ; corallites nearly straight in the 

 axial region. (Quart. Jour. Geol. Soc. Lond., vol. 30, 1874, 

 p. 506; Genus Montic, 1881, p. 116.) 



Locality. — Loveland, Ohio. 



Re))iar/cs. — This species is distinguished by the small 

 corallum, the sharply-pointed and closely-set monticules and 

 the elongated calices. 



37. — M. NKWPORTENSis Ulrich, 1883. 



Corallum sub-ramose, lobate, robust ; surface covered with 

 more or less prominent, rounded, often elongated monticules, 

 the summits and slopes of these occupied by cells larger than 

 the average ; calices sub-circular or ovate, rather regularly 

 arranged in intersecting series, sometimes surrounded by an 

 elevated rim often inflected at the points occupied by the 

 minute spiniform corallites; interstitial cells present, but not 

 readily seen externally ; longitudinal sections show two kinds 

 of corallites, the larger with tliin walls and a series of vesicles 

 on one side, with straight tabukc from the convex side to the 

 opposite wall ; the smaller corallites have crowded, horizontal 

 talnihc ; tangential sections show thin-walled tubes with 

 obscure indentations in the walls; interstitial tubes surround 



