32 PROCEEDINGS OF THE NATIONAL MUSEUM vol. 7tt 



A-fjinities. — This second species of Diplonotos differs from the- 

 genotype D. costulaturtv^ new species, in the much larger zoarial 

 dimensions, in the absence of an oral mucron, in the absence of ner- 

 vules on the cells, in the much rarer and transversely arranged vibices, 

 and in the presence of sulci and of vacuoles. The number of frag- 

 ments collected does not permit a more detailed study of this strange 

 species. 



Occurrence. — Galapagos Islands, D. 3408. 



Cofypes.—C-At No. 8504, U.S.N.M. 



Family CREPIDACANTHIDAE Levinsen, 1909 

 Genus CREPIDACANTHA Levinsen, 1909 



Norman, 1907, has given the bibliographj^ of the genotype Flustra 

 poissonii Savigny-Audouin, 1828. In 1926 we rediscovered this 

 species as a fossil at Panama, and we also gave its bibliography. In 

 1929 (Philippines) we specified the characters of the genus and we 

 tried to clear up the known species and those confused with the 

 genotype, describing three new species. We can now give the list 

 of the known species and outline the geographic extension. 



Recent species. — 



Crepidacantha (Flustra) pof ssouii Andouin, 1826 Atlantic, Pacific. 



Creindacaniha {HippofJwa) setiffcra Smitt, 1873 Gnlf of Mexico. 



Crepidacantha longiseta Canu and Bassler, 192S Gulf of Mexico. 



Crepidacantha crinispina Levinsen, 1909 Siam, Australia. 



Crepidacantha setifera, new name {=Lepra!ia poissonii MacGillivray, 1882). 



Australia. 

 Crepidacantha soJea, new name i=LepraIia poissonii Kirkp;itrick, 1888). 



China Sea. 

 Crepidacantha zelanica, new name {=Lepralia poissonii Waters, 1889). 



New Zealand. 



Crepidacantha papulifera Canu and Bassler, 1929 Sulu Sea. 



Crepidacantha altirostris Canu and Bassler, 1929 Sulu Sea. 



Crepidacantha grandis Canu and Bassler, 1929 Pacific (Philippines). 



Fossil species. — 



Crepidacantha (LepraUa) odontostoma Reuss, 1874 Miocene (Europe). 



Crepidacantha (Flustra) poissonii Audouin, 1826 Pleistocene (Panama). 



Crepidacantha parvipora, new name (=Lepralia poi- 



sonii Hincks, 1885) Miocene (New Zealand). 



This is an equatorial genus. Only the genotype occurs as far north 

 as Madeira, so that it passes but little from the warm zone. The 

 bathymetric dispersion is quite variable even for the same species. 

 However, the depths observed are never great. Below 120 meters 

 representatives of the genus are very rare. 



