BRYOZOA OF THE PHILIPPINE REGION 121 



Genotype. — Exechonella (Hiantopora) magna MacGillivray, 1895. 



Range. — Eocene (Lutetian) — Recent. 



We have classed the known species in three groups as follows: 



1. AVICULARIA PRESENT 



Exechonella (Hiantopora) magna MacGillivray, 1895 Miocene, Recent- 



Exechonella (Cyclicopora) laticella Canu and Bassler, 1920 Jacksonian. 



Exechonella (Cheilopora) prelucidioides Canu and Bassler, 



1 930 Jacksonian 



Exechonella auriculata, new species Vicksburgian. 



Exechonella (Phylactella) magniporosa Canu, 1918 Lutetian. 



2. AYICULARIA ABSENT 



Exechonella pumicosa Canu and Bassler, 1928 Recent (Gulf of 



Mexico). 



Exechonella (Cyclicopora) grandis Duvergier, 1921 Aquitanian. 



Exechonella (Lepralia) lucernula Manzoni, 1869 Miocene. 



1# ™ fOSsm mm Wc ft \ 



Jm^mkM^ «-v l *■)>• 



Fig. 28. — Genus Exechonella Canu and Bassler, 1927 



A, B. Exechonella magna MacGillivray, 1895. A. Zooecia, X 26. The 

 ectocyst is hidden by the porous calcified frontal. (After MacGillivray, 1895.) 

 B. Operculum, X85 (Philippines). 



C. Exechonella pumicosa Canu and Bassler, 1928. Operculum, X85 (Gulf of 

 Mexico). 



3. AVICULARIA ABSENT BUT VERY LONG PERISTOMIE PRESENT 



Exechonella discoidea, new species Recent (Philip- 

 pines) . 



Exechonella (Cellepora) tubulosa D'Orbigny, 1851 Burdigalian. 



Exechonella (Tubucellaria) marginata MacGillivray, 1S95 Miocene. 



The third group in which the ovicell is known, could perhaps be 

 separated as a special genus, but the number of specimens known is 

 really very small. 



EXECHONELLA MAGNA MacGillivray, 1895 



Plate 19, figs. 1-4 



1895. Hiantopora magna MacGillivray, Monograph of the Tertiary Polyzoa 

 of Victoria, Transactions Royal Society Victoria, vol. 4, p. 62, pi. 8, 

 fig. 23, pi. 10, fig. 27. 



Description. — The zoarium encrusts nullipores, sponges and shells. 

 The zooecia are distinct, separated by a furrow, somewhat elongated, 

 elliptical or orbicular; the frontal is convex, perforated by 10-15 

 large orbicular pores with small salient peristomes; it bears laterally 

 two small triangular avicularia with pivot, in which the beak is 



