NORTH A.MKRirAX EARLY TERTIARY BRYOZOA. 

 AIMULOSIA CLAVUI.A, new species. 



429 



H:lk> 9. figs. 13-16. 



Description. The zoarium incrusts bryozoa and shells. The zooecia are 

 distinct, short, a little elongated: the frontal is smooth, convex, surrounded with 

 h'.rge. triangular areolae. The apertura is somilunar with n concave poster. The 

 ovicell is large, globular, hyper-tomial: it is opened largely above the apertura. 





oes 



ph 



mr 



B 220 



FIG. 127. Genus .iiiintlosia Jullien, 1888. 



A-C. Aiiiiiilnisin auntrnlis Jullien, 1SSS. A. /ooecia, X 25. B. Polypide in place seen from 

 the dorsal face. X 220. It is rather strange that often in the digestive apparatus of bryozoa 

 the stomach .shows as an appendage of the esophagus, and that the latter appears to replace 

 in its abnormal volume the functions of the stomach (gastroid esophagus). C. Avicularium of 

 the frontal face witii its two musdi-.. r_'o. (After Jullien, 1888.) gt, tentacular sheath; 

 miir, elevator muscle of the aviculariau mandible: mr, large retractor muscles of the polypide; 

 ocs, gastroid esophagus; ph, pliaryn.N ; /. tentacles. 



The frontal avicularium is adjacent to the apertura; it is small, round, with pivot, 

 and it opens externally. 



|f<7.= . 

 M , asun mi nts. Apertura ,, 



) mm. 

 mm. 



. [7,3=0.50 mm. 

 Zooecia , 



lfe=0.25-0.30 mm. 



a. The areolae are originally small (fig. 15) ; they become larger in 

 becoming funnel shaped (fig. 13). They probably allow to pass the endocystal 

 buds, which are developed above the frontal and which deposited an irregular 

 pleurocyst (fig. 15). Very frequently the ovicell is wider than the zooecium. which 

 thus assumes the form of a nail. 



