AET. 25 GENEEA SIPHOGENERHSTA AND PAVONINA CUSHMAN 13 



SIPHOGENERINA DIMORPHA (Parker and Jones) 



Plate 3, fig. 5 



Uvigerina (Sagrina) dimorpha Parker and Jones, Philos. Trans., vol. 55, 

 1865, p. 420, pi. 18, fig. 18. 



Sagrina dimorpha H. B. Brady, Journ. Roy. Micr. Soc, 1887, p. 915. — H. B. 

 Brady, Parker and Jones, Trans. Zool. Soc. London, vol. 12, 1888, p. 

 225, pi. 45, fig. 6.— Goes, Kongl. Svensk. Vet. Akad. Handl., vol. 25, 

 No. 9, 1894, p. 52, pi. 9, figs. 510, 511.— Kiaer, Rep't. Norwegian Fish, 

 and Mar. Invest., vol. 1, No. 7, 1900, p. 37. — Heron-Allen and Ear- 

 land, Trans. Linn. Soc. London, ser. 2, vol. 2, 1916, p. 266. 



Siphogenerina dimorpha Cushman, Bull. 104, U. S. Nat. Mus., pt. 4, 1923, 

 p. 175, pi. 42, figs. 16-18. 



Description. — Test somewhat compressed, very slightly tapering, 

 the greatest width usually near the apertural end; chambers com- 

 paratively few, rather broader than high, slightly inflated; sutures 

 distinct, the basal portion in the last-formed chambers sometimes 

 slightly excavated tending to bridge the sutures between the excava- 

 tions at regular intervals; wall with a coarsely pitted surface; aperture 

 circular, terminal, at the end of a short neck, usually with a distinctly 

 phialine lip. 



Length not over O.GO mm. 



Distribution. — This species should be distinguished from the fol- 

 lowing variety. Parker and Jones figured as their type a specimen 

 from the Abrohlos Bank off Brazil. It must, therefore, be taken as 

 the type, and the Pacific form made a variety. 



Atlantic records include the i\.brohlos Bank (Parker and Jones: 

 H. B. Brady, Parker and Jones) ; Bukken and Oster Fiords, near 

 Bergen, Norway (Norman) (Brady) (Goes) (Kiaer); Vest Fiord 

 (Kiaer) ; low water, Howport, Girvan, Scotland (Robertson) (Brady) ; 

 west of Scotland, rare (Heron-Allen and Earland) ; off Gomera, 

 Canaries, and off Culebra Island, West Indies (Brady) , and possibly 

 in the South Atlantic, off Ascension Island (Brady). 



I have had specimens from off the coast of Georgia, between Cuba 

 and Yucatan, and from three stations in the Caribbean. 



It has, therefore, a rather wide Atlantic distribution. 



The Pacific form is the following variety: 



SIPHOGENERINA DIMORPHA (Parker and Jones), var. PACIFICA, new variety 



Plate 2, fig. 9; plate 3, figs. 6a, h 



Uvigerina {Sagrina) dimorpha Parker and Jones (part), Philos. Trans., 

 vol. 155, 1865, p. 420. 



Sagrina dimorpha H. B. Brady (part). Rep. Voy. Challenger, Zoology, vol. 

 9, 1884, p. 582, pi. 76, figs. 1-3.— Bagg, Bull. 34, U. S. Nat. Mus., 1908, 

 p. 152. — Schubert, Abhandl. geol. Reichs., vol. 20, pt. 4, 1911, p. 86. — 

 Sidebottom, Journ. Roy. Micr. Soc, 1918, p. 148. — Heron-Allen and 

 Earland, British Antarctic "Terra Nova," Exped., Zoology, vol. 6, 1922, 

 p. 186. 



