147 



A Note on the Batostomas of the Richmond Skkies. 



By E. I\. (jUmings and J. J. Galloway. 



Four specit's of tlif i^emis lidlnslonui h.-ivt' I)i'eii reiKirted from the Kicli- 

 uiond series, namely: Bittosfoiiia iiKiiiitalicnsc Ulrifli, fri):ii Stony Moun- 

 tain, Manitoba; B. (V) nit/osiiiii ( Wliitfield). (iiossildy a species of Cal- 

 loponi) from Delafield. Wisconsin; li. ^'(ll^illns James and B. rdrinhilc V\- 

 ricli from various places in Ohio, Kentucky, Indiana, Illinois and Wis- 

 consin. The two species last named have heretofore been confused, owin.i; 

 to inadequate description.s and ti.ijcures, although it appears that they never 

 occupy the same horizon and are really very distinct. Batoxtoiiui vuriu- 

 bilc, which has been consideicnl a rare si)ecies, occurs in si'ei^t abundance 

 at ISallstown and Weisbur;;. Indiana, in the lower part of the Whitewate'' 

 formation. 



Associated with Batoxtmini nirimis. in the upper Waynesville and 

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

 another species of Batostonia, not heretofore recognized. This is the form 

 described in the present paper as Batosfoma pros-seri nov. It differs from 

 li. rdfidiis in its ramose growth, more numerous mesojxu-es. larger acan- 

 thopores with a smaller lumen, and the al)sence of a median lamina. These 

 two species caimot readily be distinguished by external characters alone, 

 I'Ut internally they are ver.v different. 



Batostoinu ijrosscri, and the ramose forms of B. rariinis are ditticult 

 to distinguish by external appearance from Eridotriijia simiihtii ic and 

 ('(illoporu stthiiodosu with which they are associated. The encrusting 

 fcrnis of B. raritiiis might be confused with certain phases of Ccntmo- 

 liorclld. In any of these cases, however, close inspection will I'eveal char- 

 acteristic differences. The only species occurring with B. rdridhilc. with 

 which it might be confused is Rlioiiibotri/pa qiiadrata, which it resem- 

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

 itudinal sections; but the quadrate zotecia at the growing ends of the 

 branches are sufficient to distinguish the Rhoinhotrijpd. 



Communication pores, which lia\e heretofore been considered as char- 

 acteristic of the genus Homotimnt. are ft)und in abundance in many speci- 



