74 Bulletin 29 238 



After examining the types, Guppy stated that Sowerby's V. 

 soror was undoubtedly synonymous with V. palchella. 



We have a fine series of this handsome and abundant shell. 

 A single specimen has been found by Dall in the Tampa silex 

 beds. 



Localities. — (Exp'd '19) Bluff 1 (Abundant), Bluff 3, Cerca- 

 do de Mao; Zones A, B, D, E, F, Rio Gurabo at Los Quema- 

 dos; Rio Amina between Potrero and Hato Viejo. 



Genus Mitra Lamarck 



Mitra Henekeni Sowerby 

 Plate 12, Figures 5, 5a 



Mitra Henekeri Sowerby, Quart. Jour. Geol. Soc. London, vol. 6, p. 



46, pi. 9. fig. 5, 1849. 

 Mitra Henekeni Gabb, Trans. Amer. Phil. Soc, vol. 15, p. 219, 1873. 

 Mitra Henekeni Guppy (in part), Quart. Jour. Geol. Soc. London, vol. 



32, p. 528, 1876. 



Sowerby's type was immature and decollate. The adult 

 shell has ten whorls and measures 56 X 15.5 mm. A character- 

 istic is the slight truncation of the whorls at the suture, The 

 young resemble M. filosa. 



We have a large series of this fine Mitra, which also occurs 

 in the Caroni Series, Trinidad, and at Bowden. 



Localities. — (Exp'd '16) Zones A, B, E, F, Rio Gurabo at 

 Los Quemados; Zones H and I, Rio Cana at Caimito; Bluff 1, 

 Cercado de Mao. 



Mitra longa Gabb 



Plate 11, Figures 11, 11a 



Mitra tonga Gabb, Trans. Amer. Phil. Soc, vol. 15, p. 219, 1873. 

 Mitra longa Brown and Pilsbry, . Proc Acad. Nat. Sci. Phila., p. 346, 

 pi. 24, fig. 11, 1913. 



This shell is easily differentiated from M. Henekeni by its 

 slenderer form, greater number of columellar plications, and the 

 more reticulated aspect of the surface between the main revolv- 



