64 BULLETIN 161, UNITED STATES NATIONAL MUSEUM 



Variety differing from the typical in the addition of a surface orna- 

 mentation consisting of a series of costae on the lower half of the 

 penultimate chamber, occasionally on the ultimate also. 



The only specimens of the variety occur in material from Vavau 

 Anchorage, Tonga Islands, 18 fathoms; and Mokaujar Anchorage, 

 Fiji. 



PYRGO MURRHINA (Schwager) 

 Plate 15, Figures 1—3 



Biloculina murrhina Schwagee, IVouara-Expedition, Geology, vol. 2, p. 203, 

 pi. 4, figs. 15 a-c, 1866. — Mtjniee-Chalmas and Schlumberger, Bull. Soc. 

 Geol. France, ser. 3, vol. 13, p. 283, figs. 9, 10 (in text) ; p. 290, figs. 15, 16 

 (in text), 1885. — Schlumbeeger, Mem. Soc. Zool. France, vol. 4, p. 165, pi. 9, 

 figs. 52, 54; figs. 8, 9 (in text), 1891.— Egger, Abh. kon. bay. Akad. Wiss. 

 Miinchen, CI. II, vol. 18, pi. 1, figs. 19, 20, 1893.— Goes, Bull. Mus. Comp. 

 Zool., vol. 29, p. 87, 1896.— Schubert, Abh. k. k. Reichs., vol. 20, p. 122, 

 fig. 17 (in text), 1911. — Pearcey, Trans. Roy. Soc. Edinburgh, vol. 49, 

 p. 994, 1914.— Cushman, U. S. Nat. Mus. Bull. 71, pt. 6, p. 19, fig. 25 (in 

 text) ; p. 75, pi. 28, fig. 3; pi. 29, fig. 1, 1917; U. S. Nat. Mus. Bull. 100, 

 vol. 4, p. 470, 1921 ; Bull. Scripps Inst. Oceanogr., Tech. Ser., vol. 1, p. 140, 

 1927. 



Biloculina depressa d'Orbigny var. murrhyna H. B. Brady, Rep. Voy. Challen- 

 ger, Zoology, vol. 9, p. 146, pi. 2, figs. 10, 11, 18S4. — J. Wright, Proc. Roy. 

 Irish Acad., ser. 3, vol. 1, p. 462, 1891. — Chapman, Proc. Zool. Soc. London, 

 p. 7, 1895.— Bagg, Proc. U. S. Nat. Mus., vol. 34, p. 117, 1908.— Chapman, 

 Journ. Linn. Soc. Zool., vol. 30, p. 395, 1910; Zool. Res. Endeavour, pt. 3, 

 p. 310, 1912 ; Biol. Res. Endeavour, vol. 3, pt. 1, p. 5, 1915. — Sidebottom, 

 Journ. Roy. Micr. Soc., 191S, p. 9. — Heron-Allen and Earland, British 

 Antarctic Expedition, Zoology, vol. 6, p. 62, 1922. 



Pyrgo murrhina Cushman, U. S. Nat. Mus. Bull. 104, pt. 6, p. 71, 1929. 



Test in front view, in young specimens, nearly circular, in adult 

 specimens somewhat longer than broad, in end view ellipsoidal, with 

 the borders extended and carinate, the carina interrupted at the 

 point opposite the aperture, leaving a sinus, rather deep and often 

 with a long spine at each angle in young specimens ; in adults, sinus 

 less deep, and the spines usually reduced or wanting; wall smooth; 

 aperture in the young with a neck not exceeding the periphery of 

 the test; in adults with a prominently exserted tubular neck with a 

 bifid tooth partially filling the nearly circular opening. Diameter, 

 up to 1.5 mm. ; thickness, 0.5 mm. 



This species is widely distributed in deep water in all the oceans 

 and occurs in the Pliocene of the Indo-Pacific at the type locality, 

 Kar Nikobar, and in the Pliocene of Fiji. 



