ART. 14 FOSSIL AND EECEiS'T BEYOZOA^ — CAjSTU AND BASSLEE 133 



clearly schizoporoid and somewhat different from the apertiiral fomi 

 of the other species. 



The genus TremoscJiizodina is therefore not yet perfectly limited. 

 Very few specimens have been found and we have not been able to 

 make tangential sections necessary for a more complete study. It is 

 a tropical genus. 



Occurrence. — Pliocene : Minnitimmi Creek, Bocas Island, Almirante 

 Bay, northwest Panama. 



Holotype.—C&t. No. 70866, U.S.N.M. 



Genus HIPPOPODINA Levinsen, 1909 



HIPPOPODINA FEEGENSIS Busk, 1884 



Plate 34, Figures 1, 2 



1913. Lepralia feegensis Waters, Bryozoa from Zanzibar. Proceedings Zoo- 



logical Society, London, p. 514, pi. 70, figs. 21, 22. (Bibliography.) 

 Not Lepralia feegensis MacGillivray. 



Variations. — The operculum figured by Waters, 1913, indicates 

 oral dimensions of 0.22 by 0.19 mm. The aperture figured by Levin- 

 sen, 1909, measures 0.18 to 0.20 mm. in diameter or 0.21 by 0.19 mm. 

 The aperture on our specimen is 0.21 by 0.19 mm. or 0.25 by 0.22 

 mm.; it is, then, slightly larger. All the other characters are quite 

 identical with those which can be observed on the excellent figures 

 of Busk and of Levinsen. Our determination appears to us perfectly 

 exact. 



This is a tropical species observed from the African coast to the Phil- 

 ippine Islands in the Indian Ocean. Its presence has not yet been 

 noted in the Gulf of Mexico, where it may perhaps be found some 

 day, Scrupocellaria retiformis Smitt, 1872, has an analogous geo- 

 graphic distribution and we have noted its occurrence as a fossil in 

 Panama and as a living species in the Gulf of Mexico. 



Occurrence. — Pliocene : Minnitimmi Creek, Bocas Island, x4.1mirante 

 Bay, northwest Panama. 



Geographic distribution. — Indian Ocean: Philippines, 29 meters 

 (Busk); Hongkong, Sifu (Philipps); Manaar; Andamans; Cargados 

 (Thornely); Wasin, British East Africa, 16 meters (Waters). 



Plesiotype.—Csit. No. 70842, U.S.N.M. 



Family CREPIDACANTHIDiE Levinsen, 1909 



Genus MASTIGOPHORA Hincks, 1880 



MASTIGOPHORA PESANSERIS Smltt, 1873 



Plate 21, Figure 9; Plate 34, Figure 4 



1873. Hippothoa pesanseris Smitt, Floridan Bryozoa. Kongl. Svenska Ve- 

 tenskaps-Akademiens, Handlingar, vol. 11, p. 43, pi. 7, figs. 159, 160. 



1914. Escharina pesanseris Osbukn, Bryozoa of the Tortugas. Publication 



Carnegie Institution, Washington, No. 182, p. 207. 



