187 Dominican Fossils — Maury 23 



two thickened bands first losing their riblets. The three sets of 

 riblets are at first discontinuous, but later become continuous. 

 A fragment including nine whorls measures 65 by 15 mm. 



Specimens of T. sulcifera from Bailey's Ferry, Florida, 

 have the early whorls exactly like those of the Dominican shells, 

 but the second band in the later whorls tends to be slightly 

 narrower. 



The species is also reported by Guppy and Dall from the 

 Bowden beds, Jamaica. Our specimens were collected by Gabb 

 in Santo Domingo. 



Terebra Gabbi Dall 



Terebra Gabbi Dall, Proc. U. S. Nat. Mus., vol. 18, no. 1035, p. 34, 



i8 9 5- 

 Terebra Gabbi Dall, Trans. Wagner Inst. Sci., vol. 3, pt. 6, pi. 59, fig. 



31. 1903- 



This singular species, which appears like an abnormality, is 

 characterized by very rapid increase in diameter, and complete 

 loss of sculpture on attaining old age. Dr. Dall's type in a length 

 of 70 mm. widened from 2.75 to 24 mm. It is a culmination of 

 the tendency begun in T. sulcifera. 



Type locality. — Potrero, Rio Amina (Bland). 



Terebra bipartita Sowerby 

 Plate 3, Figure 14 



Terebra bipartita Sowerby, Quart. Jour. Geol. Soc. London, vol. 6, p. 



47, 1849. Not T. bipartita Deshayes, 1859. 

 Terebra bipartita Gabb, Trans. Amer. Phil. Soc, vol. 15, p. 225, 1873. 

 Terebra (Acus) bipartita Dall, Proc. U. S. Nat. Museum, vol. 18, no. 



1035, p. 38, 1895. 



Whorls girdled by a single incised line cutting them into 

 nearly equal halves; ornamentation of undulating longitudinal 

 riblets rendered discontinuous by the girdling line. Length of 

 a fragmentary shell 50, greatest diameter 12 mm. 



