2 14 THE GENUS MONTICULIPORA. 



the centre of the visceral chamber, and which form a row of 

 lenticular vesicles on one side of the tube. The other side of 

 the tube Is entirely free and open, and Is not crossed by any 

 horizontal tabulae. On the other hand, the small tubes are 

 furnished with numerous, close-set, complete, and horizontal 

 tabulae. 



The species to which ]\I. Ncwberryi most nearly approaches 

 In Internal structure Is III. Schvynii, NIch. The form of the 

 corallum In the two species Is, however, entirely different, and 

 there are Important structural differences as well. Thus, in 

 M. Sehvynii the imperfect vesicular tabulae of the large coral- 

 lltes are supplemented by a smaller number of horizontal tabulae, 

 which cross the opposite side of the tubes ; while the small 

 corallltes are aggregated at particular points into star-shaped 

 maculae. 



Horizon and Locality. — Rare In the Cincinnati Group, Cin- 

 cinnati, Ohio. (Coll. U. P. James.) 



