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. 
D *25 
Fig. 31. — Genus Ellisina Norman, 1903. 
A, B. Ellisina levata Hineks, 1882. A. Several zooecia magnified. (After Hincks, 1882.) 
B. Sketch showing dietellae. (After Norman, 1903.) 
C. Ellisina coronata Hincks, 1881. Several zooecia. (After Hincks, 1881.) 
D. Ellisina incrustans Waters, 1898. Zooecia, X 25. (After Waters, 1898.) 
The recent species belonging to this genus are as follows : 
Ellisina ( Membranipora ) levata Hincks, 1882. 
Ellisina, ( Membranipora ) coronata, Hincks. 1881. 
Ellisina ( Membranipora ) albida Hincks, 1880. 
Ellisina ( Membranipora ) minuscula Hincks, 1882. 
Ellisina ( Membranipora ) incrustans Waters, 1898. 
The fossil species are : 
Ellisina ( Membranipora ) profunda MacGillivrav, 1894. 
Ellisina (M embranipora) rhomboidalis D’Orbigny, 1852. 
Ellisina ( Reptoflustrella ) simplex D’Orbigny, 1852. 
Ellisina (Reptoflustrella) ovalis D’Orbigny, 1852. 
Ellisina \ (Membranipora) hwnaliata Brydone, 1910. 
Ellisina (E scharinella) altimuralis Ulrich and Bassler, 1901'. 
Ellisina ? angusta , Ulrich, 1901. 
Ellisina spiculosa Ulrich, 1901. 
