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PROCEEDINGS OF THE ACADEMY OF 



[Part II 



This species is far more solid than C. bidetitata (Orb.), and con- 

 stantly broader in a considerable series of both examined. For 

 comparison a figure is given of a specimen of C. bidentata measuring 

 length 3.7, diam. 1.9 mm., from Albatross Station 2275, off North 

 Carolina (Text-fig. 6). 



The only published figure of C. ovumlacerti is so inadequate that 

 one of Gabb's specimens is illustrated in text-fig. 7. 



Cydichna (?) aff. Cylichnella. bidentata d'Orb., of Toula, Jahrb. K. 

 K. Geol. Reichsanst., Bd. 61, 1911 p. 510, pi. 31, fig. 25, may be 

 the young of this species. 



The genus Cylichnella has been subordinated to Cylichna by some 

 authors, to Tomalina by others; but it appears to us gen- 

 erically distinct from both, being distinguished from Cylichna by 

 characters of the columella and from Tornatina by the wholly 

 buried spire. 



Volvula oxytata B\ish 



Volvula cyliudrica Gabb, Trans. Amer. Philos. Soc. xv, 1873, p. 246. (Not 

 of Carpenter, 1865, or of E. A. Smith, 1871.) 



This species was taken rather abundantly. It appears to be 

 quite identical with the recent form. 



The type lot of V. cijlindrica is no. 3179 A. N. S. P. 



P'ig. 9. Volvula cylichnoides P. and J. Fig. 10, Atys cinctorii P. and J. Fig. 

 II, Volvula paralella P.& J. Fig. 12, Atys sulculorum P. and J. Fig. 13, Volvula 

 ornata P. and J. 



Volvula ornata Pils. and Johns. Text-flg. 13. 



Proe. A. N. S. Phila., 1917, p. 151. 



