406 SYSTEMATIC PALEONTOLOGY 



Crisina striatopoea n. sp. 

 Plate CXVII, Figs. 1, 2, 3, 4. 



Description. — Zoariiim erect, ramose, probably not exceeding 1 cm. in 

 height, dividing dichotomonsly at intervals of about 1.5 mm. ; Ijranches 

 subovate in cross-section, thickest, uniformly convex and traversed longi- 

 tudinally by from sixteen to twenty punctate striae on the reverse side, 

 narrower and carrying alternating series of zocecial apertures on the 

 obverse side. Zocecial apertures rarely three usually four in each series, 

 in contact laterally, the inner one of each series largest, most prominent, 

 and subcircular, the outer one smallest, drawn out distally and apparently 

 grading into the pores lying between the longitudinal ridges of the 

 reverse side. Series of zooecia curving first forward then slightly back- 

 ward, separated by a deep interspace averaging about 0.2 mm. in width ; 

 about five rows in 2.0 mm. Over the Imsal part of the zoarium the 

 zocecial apertures are covered one after the other by the growth of the 

 striato-punctate dorsal integument. 



This handsome species is readily distinguished from all others known 

 to us having the character of Crisina, by the frequent dichotomization 

 of the branches. Differences in cross-sections of the branches and in 

 other respects also are to be observed when compared with most of the 

 species. 



Occurrence. — Choptank Formatiox. Jones Wharf. 



Collection. — Maryland Geological Survey. 



Family FASCIGERID/E. 



Genus THEONOA Lamouioux. 



Theonoa glomerata n. sp. 



Plate CIX, Figs. 4a, 4b, 4c, 5a, 5b. 



Description. — Zoarium cake-shaped when young and growing irregular 

 with age, the under side covered with a concentrically wrinkled epitheca, 

 the upper side with short or broken irregularly arranged celluliferous 

 ridges separated by deep interspaces. Eidges abruptly elevated, their 

 flattened summits usually exhibiting a double row of subangular zocecial 

 apertures. Here and there, probably through confluence of two or more 



