io6 Bulletin 29 270 



from the Gallopagos Islands. 



Locality. — (Exp'd '16) Zone B, Rio Gurabo at Los Oue- 

 mados. 



Simpulum antillaruwi variety cercadicum, n. var. 

 Plate 17, Figure 2 

 Cf. Triton antillarum d'Orbigny, De la Sagra, Hist. Pol. y Nat. Isla 



de Cuba, vol. 5, p. 248, 1845; Atlas pi. 23, fig. 20, 1855. 

 Shell intermediate between d'Orbigny' s two recent species, 

 S . antillarum and S. americamim, resembling the first in form 

 and the second in the callus and wrinkles of the inner lip. 

 Length 45, width 24 mm. Tryon places antillartim in the syn- 

 onymy of tuberosum Lamarck, of which we have specimens from 

 the Monte Cristi beach. It is quite a different shell with the por- 

 cellanous callus of a true Gutturnium, while our fossil shells are 

 referable to Simpulum. 



Locality. — (Exp'd '16) Bluff 3, Cercado de Mao. 



Genus Lotorium Montfort 



Lotorium prcefemorale , n. sp. 



Plate 17, Figure 3 

 Tritonium (Cymatium) femorale Gabb, Trans. Amer. Phil. Soc, vol. 

 15, p. 211, 1873. Not Triton .femoralis Linne. 

 Triton femoralis Guppy, Geol. Mag. London, p. 438, 1874. Not of 



Linne. 

 Triton femoralis Guppy, Quart. Jour. Geol. Soc. London, vol. 32, p. 

 522, 1866. Not of Linne. 



Shell resembling the recent L. femorale Linne, but differing in 

 the following respects: — ( 1 ) the spire is fusiform in the early stages, 

 the whorls not carinate, nor coronate. In femorale the spire is 

 fulguriform, coronated by a single row of tubercles; (2)the ape- 

 ture is ovate in the fossil, biangulate in the recent. 



Our party collected the recent shell on the beach at Monte 

 Cristi. It is the descendant of the ancestral species fossilized in 

 the river bluffs. 



Locality.—- (Exp'd '16) Zone F, Rio Gurabo at Los Quem- 

 ados. 



