52 



BULLETIN 71, UNITED STATES NATIONAL MUSEUM. 



Distribution.— Type-specimen (Cat. No. 8339, U.S.N.M.) from 

 Albatross station D4970, in 500 fathoms, off Japan. Two other 

 specimens were found at this station. 



This species differs from the other abruptly tapering species of the 

 genus by its more depressed sutures and its spinose surface. 



Subfamily 3, VERNETJHL.I3STIN-^E. 



This subfamily includes those genera which, at least in their early 

 development, have a distinctly triserial arrange- 

 ment of the chambers. In Verneuilina this 

 method of arrangement is continued through- 

 out the development of the test, but in other 



genera becomes 

 variously modi- 

 fied. In Gaudry- 

 ina the early por- 

 tion of the test is 

 triserial and the 

 adult arrange- 

 ment is biserial 

 and comparable to 

 Textularia. In 

 Clavulina there 

 is still another 

 regressive step 

 and the young are 

 triserial, while 

 the adult arrange- 

 ment is uniserial 



Figs. 83-84.— Pleurostomeu.aspinosa. X75. S3, a, front view; 6, aper- with a central 



TURAL VIEW WITH THE UPPER END OF THE CHAMBER SLIGHTLY BROKEN 



AND JAGGED. 84, FRONT VIEW OF ANOTHER MORE INFLATED SPECIMEN. apertUTe. 



Genus VERNEUILINA d'Orbigny, 1840. 



Verneuilina d'Orbigny (type, V. tricarinata d'Orbigny), Mem. Soc. Geol. 

 France, ser. 1, vol. 4, 1840, p. 38.— H. B. Brady, Rep. Voy. Challenger, 

 Zoology, vol. 9, 1884, p. 382. 



Bulimina (part), Reuss, Verst. Bohm. Kreid., pt. 2, 1845, p. 109, and other au- 

 thors. 



Polymorphina (pari), Schultze, Organ. Polyth., 1854, p. 61. 



Textularia (part). Pakker and Jones, Philos. Trans. Roy. Soc., vol. 155, 1865, 

 p. 371 and other authors. 



Description. Test tree, more or less elongate, tapering, in cross 

 section rounded or triangular, composed of a series of chambers 

 spirally arranged, but in three vertical columns; walls variable, 

 arenaceous or hyaline; aperture a slit at or near the base of the inner 

 margin of the chamber. 



