188 DEVONIAN FAUNA. 



1. Batostomella oomorpha, n. sp. PL XX, figs. 12, 12 a, 13, 13 a. 



Description. — Zoarium small, elongate (irregularly cylindrical?), slio wing in a 

 tangential section numerous oval or petalloid zooecia about *2 mm. in diameter, 

 with rather thick walls, more or less entirely isolated by numerous small sub- 

 angular mesopores, and occasional acanthopores. Zocecial tubes apparently (as 

 seen in a natural axial section) very long, subcylindrical, arching, and constricted 

 near the surface. 



Size of Fragment. — Length 7 mm., width 1'5 mm. 



Locality. — Lummaton. Two fragmentary specimens are in my Collection. 



Remarks. — These two small specimens have proved very perplexing ; and at 

 last I have concluded that they probably belong to the same species. One of 

 them is a transparent section which seems to show the tangential structure very 

 clearly. The zooecia are normally oval, but appear to be rendered occasionally 

 petaloid by the existence of lateral acanthopores. The mesopores vary 

 considerably in size, and would seem from their occasional opacity to possess 

 frequent diaphragms. 



The other specimen is a natural section along the axis, and shows indistinctly 

 very long tubes which arch out gently from the axis. It is by no means certain 

 that it belongs to the same species. 



I was at first inclined to regard this as a species of Gallopora, comparing it 

 with G. subnodosa, Ulrich, 1 to which it seemed very similar ; but further examination 

 revealed the evident presence of acanthopores, and therefore shut it out of this 

 genus. On the other hand, a further comparison of the two specimens with the 

 various species of Batostomella given by Ulrich seemed to show so many common 

 features that I think it may with sufficient probability be provisionally referred to 

 that genus, although the mesopores seem on the whole larger than appears to 

 be the case in any of Ulrich' s figured species. It is certainly unfortunate that I 

 have been unable to procure a transverse section. As the specimens show some 

 beautiful detail, and seem unlike anything I know, I venture to suggest the 

 specific name. 



1 1S90, Ulrich, ' Geol. Surv. Illinois,' vol. viii, p. 417, pi. xxxiii, figs. 5 — 5c. 



