474 BULLETIN 100, UNITED STATES NATIONAL MUSEUM 



The study of the inner face is very interesting. Manifestly the 

 animal wishes to remove itself from its substratum and for this reason 

 it constructs this bizarre formation of tuberosities and spines as may 

 be readily observed. 

 Occurrence. — 



D. 4807. Cape Tsiuka, Sea of Japan; 41° 36' 12" N.; 140° 36' E. 

 D. 5137. Jolo Light, Jolo; 6° 4' 25" N.; 120° 58' 30" E.; 20 



fathoms; S. Sh. 

 D. 5141. Jolo Light, Jolo; 6° 9' N.-; 120° 58' E.; 29 fathoms; 



co. S. 

 D. 5145. Jolo Light, Jolo; 6° 4' 30" N.; 120° 59' 30" E.; 23 



fathoms; co. S., Sh. 

 D. 5147. Sulade Island, Sulu Archipelago; 5° 41' 40" N.; 120° 



47' 10" E.; 21 fathoms; co. S., Sh. 

 D. 5151. Sirun Island, Sulu Archipelago; 5° 24' 40" N.; 120° 



27' 15" E.; 24 fathoms; co. S., Sh. 

 D. 5162. Tinagta Island, Tawi Tawi Group; 5° 10' N.; 119° 47' 



30" E.; 230 fathoms; S. brk., Sh. crs.; 11.6° C. 

 D. 5574. Simaluc Island, north of Tawi Tawi; 5° 30' 45" N.; 



120° 07' 57" E.; 340 fathoms. 

 D. 5577. Mount Dromedario, north of Tawi Tawi; 5° 20' 36" 

 N.; 119° 58' 51" E.; 240 fathoms; crs. S.; 12.4° C. 

 Cotypes.— Cat. Nos. 8267-8270, U.S.N.M. 



Family MAMILLOPORIDAE Canu and Bassler, 1927 



Hexapogona with orbicular zoarium without pit. The cells are 

 juxtaposed. The proximal border of the apertura is oriented towards 

 the apex. The ovicell has a special interzooecial cavity and is closed 

 by the operculum. 



We believe that the genera of the old family of Conescharellinidae 

 can be separated into two groups. The first is one rich in species 

 with very frequent ovicells; the second comprises the species with 

 very rare ovicells. It is very difficult to conceive that their larvae 

 are identical. Moreover Conescharellina with its distal sinus and its 

 inferior aperture is certainly of very different anatomical structure. 



The genera of this family are Mamillopora Smitt, 1872, Fedora 

 Jullien, 1881, Ascosia Jullien, 1882, and Anoteropora and Stenosipora 

 Canu and Bassler, 1927. 



According to Waters, 1919, it is necessary to class with Mamillopora 

 the ancient genera Discoflustrellaria D'Orbigny, 1852, (part); Eioni- 

 della Koschinski, 1875 and Prattia, D'Archiac, 1847. 



