50 COJLORADO COLLEGE STUDIES. 



ASTROECENIA NIDIFORMIS, Sp. nov. 



Stock massive, broad and low, its breadth increasing more 

 or less from the base xapwaixl, its summit excavated, the prom- 

 inent, narrowly-rounded border-region of the summit being 

 irregularly lobed; cells united by 'rather thicks walls, calyces 

 small, irregularly iwlygonal or slightly rounded-polygonal; 

 columella short; septa rather stout, their free margins appar- 

 ently a little uneven, their summits moderately depressed 

 below the level of the calyx-borders, the primary and sec- 

 ondary septa six each, short septa of the third order also 

 appearing. 



Measurements.— Maximnm breadth of polyp-stock 102, 

 breadth at right angle to line of maximum breadth 95, height 

 29; average diameter of calyces, including half of the inter- 

 calycular walls 2, thickness of inter-calycular substance .4-. 7 

 (average about .5) mm. 



Occurrence. — The type was collected, several years since, 

 from the platform of arenaceous shell-conglomerate that caps 

 the Cheyenne sandstone and forms the base of the Kiowa 

 shales at Belvidere, Kansas. (No. 5 of the writer's Belvidere 

 section.) A second specimen was recently collected by the 

 w^riter, but was so poorly preserved as to be of little use for 

 purposes of study. 



Hemipedina charltoxi, sp. nov. 



Test small, round-pentagonal, arched above, concave be- 

 low; apical disc and periproct moderately broad; peristome 

 considerably smaller in proportion to the test than in Psendo- 

 diadema fexannm, Roemer; pore-belts straight, the pores 

 somewhat elongated in the direction of the belt, the pore- 

 pairs simple throughout and somewhat oblique; ambulacral 

 arese half as broad as the interambulacral, each ornamented 

 with two rows of primary tubercles that are somewhat smaller 

 than those of the row of largest tubercles on the interambu- 

 lacral arepe, each primary tubercle being subtended by an 

 irregularly polygonal string of smaller (secondary) ones; 

 interambulacral arete with six rows of primary tubercles, 

 these being much larger in the middle row of each semiambu- 



