357 Dominican Fossils — Maury 19: 



icate concentric lines; outline sub -rhomboid al, hinge line recti- 

 linear. Length 8, altitude 15, semidiameter 3 mm. This shell 

 is of the same general type as the recent M. tulipus and the Mio- 

 cene inflatus, and belongs to the section Modiolus, sensu stricto. 

 No shell of its type has been reported from the blue clays of 

 Santo Domingo or the Bowden beds of Jamaica. Although prob- 

 ably immature it seems best to name it, thus calling attention to 

 the fact that we have found both smooth and ribbed representa- 

 tives of the genus in the blue clays. 



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

 shell). 



Genus Botula Moerch 



Botula hispaniol<z, n. sp. 

 Plate 35, Figure n 



Shell resembling the Oligocene to recent, species B. cinnamo- 

 mea Lamarck and the Pliocene B. incurva Gabb from Costa Rica 

 but very much smaller than either and apparently distinct. All 

 our shells are of uniform size and appear adult, they are strongly 

 marked with irregularly spaced concentric growth lines and the 

 surface shows very fine radial striae. Our recent specimen of B. 

 cinnamomea from the West Indies is nearly smooth, its length 33 

 and greatest altitude 15, being more than twice the length of 

 our fossils. Gabb's B. incurva is 23 long and its beaks are more 

 incurved than in our shells, which measure in length 16, altitude 

 7, diameter 9 mm. 



This curious shell is quite different from any other form we 

 collected and easily recognized by its odd shape and deeply sinu- 

 ous base. It is the first Botula ever found in the blue clays. 



Locality. — (Exp'd '16) Zone H, Rio Cana at Caimito. 

 (Quite common boring in coral). 



Genus Lithophaga Bolten 

 Lithophaga antillarum d'Orbigny 



Lithodomus antillarum d'Orbigny, Hist. Pol. y Nat. Isla de Cuba, 

 p. 351, 1845; Atlas pi. 28, figs. 12, 13, 1855. 



