708 



BULLETIN 106, UNITED STATES NATIONAL MUSEUM. 



Genotype. Plagioecia (Diastopora) patina Lamarck, 18 1G. 

 Range. Jurassic-Recent. 



V 



B D j 



FIG. 232. Genus Crisidia Milne-Edwards, 1838. 



A. Zoarlnm natural size of Crisidia (Sertitlaria) cornuta Ellis, 1755. 



B. Portion of a colony, X 36, of Crisidia (Crisia) franciscana Robertson, 1910, showing 

 method of branching, and formation of ordinary and of ooecial internodes. The ordinary uui- 

 serial interuode consisting of a zooecium (zoe) giving origin to two other zooecia (fir). The 

 (oe) the second member, the zooecium s 3 , a third member. Arising from a basal ramus (ba. r.) 

 on the third zooecium is a fourth zooecium ('), which serves to continue the branch upward. 

 The prominent ooecium (oe) having a well developed tube (ocst. t.) at its summit, bent slightly 

 backward. (After Robertson, 1910. 



C. Ovicell of Crisidia cornuta Ellis. (After Harmer, 1891.) 



D. Branch of Crisidia cnrmita Ellis, 1755, X 36, showing uniserial arrangement of zooecia. 

 (A-H after Hincks, 1SSO.) 



The other known species belonging to this genus are : 



Berenicea latomarginata D'Orbigny, 1852. Piocene-Recent. 



Diastopora lactea Jullien, 1884. Recent. 



Proboscina sartha-censis Pergens, 1890. Cenomanian. 



Mesenteripora compressa. Goldfuss, 1827. Cretaceous. 



Reticulipota obliqua D'Orbigny, 1850. Cretaceous. 



Discosparsa clypeiformis D'Orbigny, 1853. Turonian-Senonian. 



Entalopliora ramosissima D'Orbigny, 1850. Cenomanian-Coniacian. 



Diastopora echinata Pocta, 1892. Cenomanian. 



Berenicea folium Novak, 1877. Cenomanian. 



Berenicea archiaci Haime, 1854. Jurassic. 



Berenicea diluviana Lamouroux, 1821. Bathonian. 



Diastopora michclin.i Blainville, 1830. Bajocian-Bathonian. 



Berenicea undulata Michelin, 1846. Bajocian-Bathonian. 



