174 Cincinnati Society of Natural History. 



VINELLA REPENS, n. Sp. 



Fig. 1.— Vinella repens, n. gen. et sp. a, two colonies attached to the inner side of 

 the ventral valve of a thin variety of Streptorhychus filitextus, Hall, b, part of one of 

 them magnified eighteen times. The pores are absent, probably not having been 

 preserved, c, Part of another portion of same, xl8, showing a central point with 

 five divisions of the tubular stolon radiating from it. This portion of the specimen 

 also preserves the pores, marking the points where the zooecia were attached, d, 

 another specimen attached to fragment of shell, e, small portion of same where 

 three tubes lie parallel with each other. No pores could be made out on this speci- 

 men, but the longitudinal lines are more distinct than on the other specimen. 



Zoarium repent, the stolons delicate, thread-like, often longitu- 

 dinally striate, straight or flexuous; from 0.06 to o. 11 mm. in 

 diameter ; bifurcating often and sometimes arranged in a radical 

 manner about a central node. Where best preserved, very small 

 pores arranged uniserially along the center of the upper surface of 

 the threads; about eleven in 2.5 mm. Zocecia unknown, prob- 

 ably deciduous. 



Similar organisms occur in Cincinnati, Wenlock and Chester 

 groups. Being undescribed, comparisons would be useless. 



Position and locality : Upper beds of the Trenton Shales at St. 

 Paul, Minn. 



