16 PROCEEDINGS OF THE NATIONAL MUSEUM vol.67 



SIPHOGENERINA ADVENA Cushman 



Plate 5, figs. 3a, b 



Siphogenerina advena Cushman, Publ. 311, Carnegie Inst. Washington, 1922, 

 p. 35, pi. 5, fig. 2; Bull. 104, U. S. Nat. Mus., pt. 4, 1923, p. 173, pi. 42, 

 fig. 15. 



Description. — Test elongate, somewhat compressed, early portion 

 either triserial or biserial, later portion, which makes up the larger 

 portion of the test, imiserial; chambers numerous, distinct, inflated; 

 sutures somewhat depressed, the early portion and a part of the 

 uniserial portion with fine, longitudinal costae, more or less broken, 

 followed by two or three chambers slightly spinose, after which the 

 remaining chambers are smooth and very finely punctate; aperture 

 elliptical, each one connecting with the preceding by an internal 

 funnel-shaped tube. 



Length up to 0.65 mm. 



Distribution. — This species was originally described from the 

 Tortugas region of southern Florida in comparatively shallow water. 

 It has also occurred in the western part of the Caribbean off Central 

 America in 382 fathoms, and off the Carolina coast in 168 fathoms. It 

 seems therefore to be a species of the tropical western Atlantic. 



A small species was figured by Goes as " Textularia Pennatula, var. 

 aculeata forma Bigenerina'V^ and he afterwards gave it a new name, 

 Sagrina pygmaea.^^ The specimen was from 300 fathoms in the 

 Caribbean Sea. It may possibly be the same as our species, but the 

 figure does not show any surface ornamentation, and his description 

 is inadequate. I have not found his type specimen. 



SIPHOGENERINA BIFRONS (H. B. Brady) 



Plate 3, figs. 7-9; plate 4, fig. 4 



Sagrina bifrons H. B. Brady, Quart. Journ. Micr. Sci., vol. 21, 1881, p. 64; 



Rep. Voy. Challenger, Zoology, vol. 9, 1884, p. 582, pi. 75, figs. 18-20.— 



MiLLETT Journ. Roy. Micr. Soc, 1903, p. 270. — Chapman, Journ. Linn. 



Soc. Zool., vol. 30, 1910, p. 415. — Schubert, Abhandl. geol. Reichs., vol. 



20, pt. 4, 1911, p. 86. — Heron-Allen and Earland, British Antartic 



Exped., Zoology, vol. 6, 1922, p. 186. 

 Siphogenerina {Sagrina) bifrons Egger, Abh. kon. bay. Akad. Wiss. Miin- 



chen, CI. II, vol. 18, 1893, p. 317, pi. 9, figs. 25, 26, 29. 

 Siphogenerina bifrons Cushman, Bull. 71, U. S. Nat. Mus., pt. 3, 1913, p. 



105, pi. 45, figs. 1, 2, 5-7; Bull. 100, vol. 4, 1921, p. 277, pi. 56, figs. 2, 3. 



Description.— Test elongate, compressed, straight or very shghtly 

 curved, in end view elliptical, median portions of the broad faces 

 somewhat concave, megalospheric form with the initial end broadly 

 rounded and of about the same diameter as the rest of the test, 

 microspheric form with the initial end much more attenuate, grow- 



1" Kongl. Svensk. Vet. Akad. Handl., vol. 19, No. 4, 1882, p. 79, pi. 5, figs. 165, 166. 

 » Bull. Mus. Comp. Zool., vol. 29, 1896, p. 51. 



