126 



BULLETIN 106, UNITED STATES NATIONAL MUSEUM. 



This is the Membranipora coronata group of Waters, which he defined as 

 follows : " Small avicularium above the zooecium : ovicells small, globular, or 

 cucullate." 



The opercular valve always closes the ovicell. but may open it either by eleva- 

 tion or depression for the escape of the larvae. 



,'A 



D.25 



FIG. 31. Genus Ellisina Norman, 1903. 



A, B. EUisina Icrata Hincks, 1882. A. Several ximccia inainiitieil. (After Hincks, 1882.) 

 B. Sketch showing dietellae. (After Norman, 1903.) 



C. Enisina coronata Hincks, 1881. Several zonecia. (After Hineks, 1881.) 



D. EUisina incrustans Waters, 1898. Zooecia, X 25. (After Waters, 1898.) 



The recent species belonging to this genus are as follows : 

 Enisina. (Membranipora'] levata Hincks. 1882. 

 Ellixina (Membranipora) coronata Hincks. 1881. 

 ElJisina (Membranipora) albida Hincks. 1880. 

 EWisina (Membranipora) minuscula Hincks, 1882. 

 EUisina (Membranipora) incnistaris Waters. 1898. 

 The fossil species are : 



Ellisina (Membranipora] pro fv ml a MacGillivray, 1804. 

 Enisina (Membranipora) rkomboidalis D'Orliigny, 1852. 

 EJlisinn (Reptof/ustrella) x/mpli.i' D'Orbigny. 1852. 

 EUisina (Reptoilustrella) oralis D'Orbigny. 18;-)2. 



(Membranipora) Jnimalififa- Brydone. 1910. 



(Escharinella) altimiiralis Ulrich and Bassler. 1907. 

 Ellisina f.angusta, Ulrich, 1901. 

 Ellis'ina spiculosa ITlrich, 1901. 



