147 



A Note on the Batostomas op the Richmond Series. 



Bv E. It. (.'UMINGS and J. J. Galloway. 



Four specifs of tlic m'lnis Jialoslouui have been roiiorttnl from the Rich- 

 mond series, namely: Baioatoina iiiiiiiitohcii.se Ulrich, from Stony Moun- 

 tain, Manitoba; B. (?) ri([/osuin (Whitfield), (possibly a species of Cal- 

 lopora) from Delafiekl, Wisconsin; B. Varians James and B. rariabile Ul- 

 rich from A-arious places in Ohio, Kentucky, Indiana, Illinois and Wis- 

 consin. Tho two species last named have heretofore been confused, owin;? 

 to inadequate descriptions and figures, although it appears that they never 

 occupy the same horizon and are really very distinct. Batostoma raria- 

 hile, which has been considered a rare species, occurs in great abundance 

 at Kallstown and Weisburg, Indiana, in the lower part of the Whitewater 

 formation. 



Associated with Batostoma varians, in the upper Waynesville and 

 lower Liberty formations on Tanner's Creek, Indiana, near Weisburg, is 

 another species of Batostoma, not lieretofore recognized. This is the form 

 described in the present paper as Batostoma, prosscri nov. It differs from 

 B. varians in its ramose growth, more numerous mesopores, larger acan- 

 thopores with a smaller lumen, and the absence of a metlian lamina. These 

 two species cannot readily be distinguished by external characters alone, 

 but internally tliey are very different. 



Batostoma prosscri and the ramose forms of B. varians are difficult 

 to distinguish by external appearance from Eridotriipa simitlatiix and 

 CaUopora snhnodosa with which they are associated. The encrusting 

 forms of B. varians might be confused with certain phases of Ccramo- 

 porcUa. In any of these cases, however, close inspection will reveal char- 

 acteristic difl'erences. The only species occurring with B. variahilc, with 

 which it might be confused is Rhomljotrijpa quadrata, which it resem- 

 bles in zoarial characters, and to a less extent in deep tangential and long- 

 itudinal sections; but the quadrate zooecia at the growing ends of tho 

 branches are sufHcient to distinguish the Rhombotrypa. 



Communication jwres, which have heretofore been considered as char- 

 acteristic of the genus Homotrj/pa, are found in abundance in many speci- 



