90 GEOLOGY AND PALEONTOLOGY OF THE WEST INDIES. 



Family CRTBRILINID.S: Hincks, 1880. 



Genus PUEIXINA Jullien, 1886. 



Puellina radiata carolinensis Gabb and Horn, 1862. 



(Plate 1, Figure 12.) 



Reptesekarella carolinensis Gabb and Horn, Journal Academy Natural Science, Philadelphia, 

 5, p. 136, plate 19, fig. 18, 1862. 



This variety is characterized by its smooth peristome, without 

 tuberosities, and by the small canal of the avicularium, which is larger 

 than in the type. 



In reality the spines have hot disappeared; on the perfect specimens 

 they are still visible; but they never have the size and importance of 

 those which decorate the type. The zocecia are a little larger and have 

 16 costules. 



Occurrence. — Jacksonian of South Carolina and Alabama; Vicks- 

 burgian of Alabama; Oligocene (Anguilla formation), southwest side 

 of Crocus Bay Bluff, 125 feet above sea-level, Anguilla (loc. No. 6967) ; 

 Oligocene (Antigua formation), Rifle Butts, Antigua (loc. No. 6854), 

 T. W. Vaughan, collector. 



Family ESCHARELLID^ Levinsen, 1909. 



Genus SCHIZOPODRELLA Canu and Bassler, 1917. 



Schizopodrella (?) mutabilis, new species. 



(Plate 6, Figures 3 to 5.) 



The following is a description of this species: 



The zoarium is unilamellar, tubular; it incrusts the fine radicells of algae. 

 The zocecia are little distinct, elongate, elliptical; the frontal iB little convex, 

 surrounded by areolar pores and garnished with some large tremopores. The 

 apertura is elongate, oval, with a wide rimule separated from the anter by two 

 salient condyles. 



Measurements. — Apertura: ka=0.18 to 0.20 mm., Za=0.12 mm.; zocecium: 

 1*2=0.70 mm., te=0.34 mm. 



Affinities. — The very thick incrustation of the tremocyst renders the 

 aspect of the species quite changeable and sometimes absolutely un- 

 recognizable. 



We have not discovered the ovicell, so the classification naturally 

 remains doubtful. 



Occurrence. — Lower Miocene (Bowdeh horizon), Cercado de Mao 

 (Bluff 3), Santo Domingo. 



Schizopodrella unicornis Johnston, 1847. 



Lepralia unicornis Johnston, History of British Zoophytes, ed. 2, p. 320, plate 57, fig. 1, 1847. 



Schizoporella unicornis Hincks, British Marine Polyzoa, p. 238, plate 35, figs. 1-5, 1880. 



Schizoporella unicornis Jelly, A Synonymic Catalogue of Marine Polyzoa, p. 236, 1889. 

 (General bibliography.) 



Schizoporella unicornis Canu, Bryozoaires f ossiles des Terrains du Sud-ouest de la France, 

 Bulletin de la Socifitfi geologique de France, p. 516, 1906. (Bibliography.) 



Schizoporella unicornis Osburn, The Bryozoa of the Tortugas Islands, p. 205, 1914. (Ameri- 

 can bibliography.) 



Schizoporella subguadrata Ulrich and Bassler, Maryland Geological Survey, Miocene, p. 420, 

 plate 114, fig. 1; plate 118, figs. 5, 6, 1904. 



