1 6 Bulletin 29 180 



Localities. — (Exp'd '16) Bluff 3 (very abundant), Bluff 2 

 (one only), Cercado de Mao; Zone H (one only), Rio Cana at 

 Caimito. 



Acteocina (Cylichnella) ov um- lacerti Guppy 



Cylichna ovum-lacerti Guppy, Geol. Mag. London, vol. xi, p. 407, pi, 



18, fig. 22, 1874. 

 Cylichnella bidentata Gabb (in part), Trans. Amer. Phil. Soc, vol. 15, 



p. 273, 1873. 

 Tornatina {Cylichnella) ovum-lacerti Dall (in part), Proc. U. S, Nat. 



Mus., vol. 18, no. 1035, p. 27, 1895. 



As noted under the preceding species, among hundreds of 

 Cylichnellas we have none over 3 mm. in length; but one of 

 Gabb's Dominican shells sent to Cornell (Museum No. 7638) as C. 

 bide?itata is 4 mm. in length by 2 in width. The shell is worn 

 so one cannot tell whether the entire surface was striate, but its 

 size alone discriminates this shell from all the rest. Apparently 

 it is referable to Guppy' s species. 



As with all of Gabb's Dominican specimens, no locality is 

 given; but Dr. Dall has identified as C. ovum-lacerti specimens 

 No. 113746 m the U. S. National Museum from Potrero, Rio 

 Amina. The type locality was Trinidad. 



Genus Volvula A. Adams 



Volvula cylindrica Gabb 

 Plate 3, Figure 5 



Volvula cylindrica Gabb, Trans, Amer. Phil. Soc, vol. 15, p. 246, 1873. 

 Volvula cylindrica Guppy, Quart. Jour. Geol. Soc. London, vol. 32, p. 



518, 1876. 

 Volvula oxytata Bush, Trans. Conn. Acad., vol. 6, p. 468, pi. 45, fig. 



12, 1885. 

 Volvula oxytata Dall, Bull. 37, U. S. Nat. Mus., p. 86, pi. 41, fig. 12, 



1889. 

 Volvula cylindrica Dall, Trans. Wagner Inst. Sci., vol. 3, pt. 1, p. 16, 



1890; Id. pt. 6, p. 1583, 1903. 

 Ci. Bulla {Volvula) cf. oxytata Toula, Jahrb. K — K. Geol. Reichs- 



anst., Wien, vol. 58, p. 709, pi. 28, fig. 4, 1908. 



