ORDER i CYCLOSTOMATA 265 



Discoporella, Gray), (Figs. 430, 431 ). Like Apsendesia, except that interstitial cells occur 



Fio. 4LV,. 



l>:.-n;t,-iit!.t c mil-til, d'Orb. Upper Cretaceous ; France. Specimen 3 /4 

 natural size, and three views of same enlarged (after d'Orbigny). 



Fio. 427. 



:l!il<l'-IIIH, (illl'lf. sp. 



t"]i|T ('retari't.us ; Mat-strirlit. 

 .1, /(inriiini, '/i- /.'. 1'rotile of 

 same. C, Upper surface, enlarged. 



between the elevated rows of zoo2cial apertures, on a depressed space at the centre of 

 each disk, and often also on the under surface of the zoarium. Jura to Recent. 



Fio. 428. 



Apsendesid Gaudryana, d'Orb. 

 Upper Cretaceous ; France. 

 Upper surface, 8/j. 



Fio. 429. 



Apsendesia (Buskia) tabulifera, Roeiner sp. Astrupp, Westphalia. A, 

 Zoarium, i/ z . J5, Cluster of zocecial apertures, enlarged. 



Stellocavea, d'Orb. Zoaria discoidal, the upper surface exhibiting the salient edges of 



FIG 430 



Lichennpora (Rudiopora) stellata, Goldf. sp. Planer; Plauen, Saxony 



5: SStfL Same> enlarged - c > Ver " cal section of specimen from 



numerous radially arranged plates, few of them reaching the centre. Zocecial tubes 



