iRT. 25 GENERA SIPHOGENERINA AND PAVONINA CUSHMAN 21 



Specimens are recorded from the Miocene (Filter Quarries) of 

 Victoria by Heron- Allen and Earland.^^ I have had specimens from 

 the same locality, but none of them show the embracing chambers 

 of typical recent specimens, and the surface ornamentation seems 

 different. Howchin 2* records the species from the Eocene of Muddy 

 Creek, Victoria, but does not figure it. 



The figures of this species given by Heron-Allen and Earland 

 from the Kerimba region show very beautiful tests. The largest of 

 their specimens figured is slightly more than a millimeter in diameter. 



Pavonina fiabelliformis is replaced in the Atlantic by the following 

 species : 



PAVONINA ATLANTICA Cushman 



Plate 6, figs. 5, 6 



Pavonina flabelliformis H. B. Brady (in part) (not d'Orbigny), Rep. Voy. 

 Challenger, vol. 9, 1884, p. 374, pi. 45, fig. 18 (not 17, 19-21).— Wood- 

 ward, The Observer, vol. 4, 1893, p. 104. 



Pavonina atlantica Cushman, Bull. 104, U. S. Nat. Mus., pt. 3, 1922, p. 51, 

 pi. 19, fig. 1. 



Description. — Test subtriangular, slightly longer than broad, initial 

 end with a short spine, very much compressed, the sides carinate; 

 chambers comparative!}^ few, the earliest ones alternating, biserial, 

 those of the adult uniserial, broad, and low, extending across the 

 width of the test, slightly curved backwards at the ends; sutures 

 somewhat limbate, wall thin and transluscent, finely perforate; 

 apertures numerous on the terminal wall of the last-formed chamber. 



Length up to 0.5 mm. 



The type specimen of this species is from off Sand Key, Florida, 

 in 92 fathoms. It was also found at stations off Florida and in the 

 Tortugas lagoon. The specimens recorded by Brady as P. flabelli- 

 formis from off Culebra Island in 390 fathoms are this species. 

 Plate 45, Figure 18, of the Challenger Report is from this station. 

 Figures 19 and 20 are P . flabelliformis from shore sand of Tamatave, 

 Madagascar, and Figure 21 is from off Calpentjm, Ceylon in 2 

 fathoms. I have no data for Figure 17, but it is probably from 

 Madagascar. 



Brady's figure (pi. 45, fig. 18), shows the traces of the lateral car- 

 inae characteristic of P. atlantica. 



Pavonina atlantica in its very triangular form throughout instead 

 of the circular form of P. flabelliformis is very distinctive. In this 

 character P. atlantica is nearer to the following species: 



23 Journ. Roy. Micr. Soc, 1924, p. 141, pi. 8, fig. 22. 



2< Trans. Proc. Roy. Soc. So. Australia, vol. 12, 1889, p. 7. 



