BRYOZOA. 69 



3 to 5 millimeters across, and from 6 to 8 millimeters from crest to crest. The zooecia 

 are arranged in fairly definite rows, about .23 mm. apart, and about the same dis- 

 tance apart in the rows, giving a reticulate pattern to the surface. They average .25 

 mm. in diameter. The margins of the peristomes are strong, and the posterior part of 

 the margin is the more distinctly elevated. 



Occurrence — Mineola of Montgomery County. 



Order Trepostomata 



Family Batostomellidae 



Genus Lioclema Ulrich 



Lioclema occidens (Hall and Whitfield) 

 Plate 4, figures 7 and 8; plate 9, figure 15; plate 10, figures 4 and 7. 



1873. Fistulipora occidens Hall and Whitfield, Twenty-third Ann. Rept. New York 



State Cab. Nat. Hist., pp. 228-229, pi. 10, figs 9 and 10. 

 1878. Callopora cincinnatiensis Ulrich, Jour. Cincinnati Soc. Nat. Hist. I, p. 93, 



pi. 4, figs. 8, 8a. 

 1882. Callopora cincinnatiensis Ulrich, Jour. Cincinnati Soc. Nat. Hist., V, p. 142, 



pi. 6, figs. 18, 18a. 

 1890. Leioclema occidens Ulrich, Geol. Sur. Illinois, VIII, pp. 426-427. 

 1900. Lioclema occidens Nickles and Bassler, American Fossil Bryozoa, Bull. U. S. 



Geol. Surv., 173, p. 305. 

 1909. Leioclema occidens Greger, Am. Jour. Sci., XXVII, p. 376. 



Ulrich's description — "Zoarium exceedingly variable in form, commonly irregu- 

 larly ramose or lobate. Surface smooth, occasionally (in exceptionally well preserved 

 specimens) minutely spinulose, but this is never a conspicuous feature. Walls of 

 zooecia thin, somewhat flexuous in the axial region, slightly thickened in the peri- 

 pheral region. Apertures of zooecia circular from 0.15 to 0.20 mm. in diameter, seven 

 or eight in the space of two mm.; encircled by a single series of large angular or sub- 

 circular mesopores, on an average about two-thirds the size of the true zooecia. Dia- 

 phragms rather few and remote in the zooecial tubes, in the mesopores more numerous, 

 and about their diameter or more apart. Acanthopores small., present in moderate 

 numbers, and at times encroaching a little upon the zooecia." 



Remarks — Of the Missouri specimens none shows acanthopores; the diaphragms 

 are about as numerous in the mesopores as in the zooecia; in some places more than one 

 row of mesopores separates the zooecia. In the original description mention is made of 

 "low, rounded tubercles" irregularly spaced on the surface of the zoarium, and such 

 tubercles are present on most of the Missouri specimens, though they are widely spaced 

 and often absent over large surfaces. Lioclema occidens (Ha\\ and Whitfield) is abundant 

 near the bottom of the Snyder Creek shale, at many places in Callaway and Mont- 

 gomery Counties. In the same bed Stropheodonta boonensis Swallow is abundant. 



Order Cryptostomata 



Family Fenestellidae 



Genus Fenestella Lonsdale 



Fenestella missouriensis n. sp. 



Plate 9-, figures 13 and 14. 



Description — Species known from one fair specimen and several fragments. Zoar- 

 ium growing into large flabellate expansions. Branches averaging about 5 in 10 milli- 



