MARYLAND GEOLOGICAL SURVEY 435 



length and about 0.35 mm. in widtli. Orifice oblique^ depressed in 

 front, transversely subovate, broadly sinuate below; peristome scarcely 

 thickened. Central portion of surface very high, the slopes traversed 

 by rows of large punctures in radially disposed furrows. Ovicells not 

 ol:tserved ; nor avicularia, unless certain elongate-acuminate, curved 

 depressions, with a pore at the l)roader lower extremity, that sometimes 

 may be observed close to the rim of the orifice, are of that nature. 



This rather highly ornamented form reminds in certain respects of 

 Cribrilina, but on the whole it agrees better with Lepralia. The strik- 

 ingly monticular elevation and strongly puncto-radiate marking of the 

 surface of the zooecia will, we l)elieve, serve very well in distinguishiiiii' 

 the species. 



Occurrence. — St. Mary's Formation. St. Mary's Eiver. 



Collection. — Mar3'land Geological Survey. 



Lepralia marylandica n. sp. 

 Plate CXVII, Fig. 2. 



Description. — Zoarium forming small patches on shells. Zooecia 

 oblong subquadrate, averaging 0.5 mm. long and only half as wide, 

 arranged in irregular radial series ; impressed border line between ad- 

 joining cells not sharply defined; surface coarsely punctate, very mod- 

 erately convex. Orifice terminal, transverse, semielliptical to subquad- 

 rate, the lower border nearly straight, thick, and generally with a small 

 central tubercle, the anterior rim usually a little depressed. Surface 

 punctures variable, generally of smaller size for some distance behind 

 the orifice, but sometimes consisting of two concentric rows of which 

 those making up the inner row are quite as large as those in the outer 

 row. Avicularia small, constantly one on each side of the orifice, the 

 acuminate and more or less elevated anterior extremity pointing some- 

 what obliquely outward and forward. Ovicells not very numerous, a 

 little larger than the zooecial orifice, moderately convex, minutely punc- 

 tate. 



This species probably will not be allowed to remain under Lepralia 

 when the classification of the Bryozoa has been advanced to an approxi- 



