2o8 BuUJSTlN 29 372 



Carpenter 1855, an d renamed Gabbi by Dall in 1900. This spe- 

 cies has never been figured but the description sounds like our 

 shell except Gabb says it is smooth while ours is minutely punc- 

 tate. We have no metatypes of Gabb's for comparison but 

 should the two species prove identical puncturella has precedence. 

 Localities. — (Exp'd '16) Bluff 3, Cercado de Mao ; Zone I, 

 Rio Cana at Caimito. 



Genus Montacuta Turton 



Montacuta cercadica, n. sp. 



Plate 39, Figure 2 



Shell very inequilateral, with the general form of M. aciino- 

 phora Dall from the Oligocene of Oak Grove, Florida ; but with 

 the posterior, shorter end more evenly rounded ; the anterior, 

 longer and more pointed ; and the shell decidedly inflated, not 

 at all compressed. Substance of shell thin and fragile, trans- 

 lucent ; surface marked only by delicate, irregularly spaced con- 

 centric striations ; hinge delicate with a rather strong cardinal 

 "hook." Length 6.60, altitude 5.50, semidiameter 1.50 mm. 

 This genus has never before been found in the blue clays of San- 

 to Domingo, nor is it known at Bowden. 



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



Montacuta maoica, n. sp. 

 Plate 39, Figure 3 



Shell fragile, very inequilateral, resembling in form M. chip- 

 olana Dall, from the Oligocene of Florida, and closely related to 

 that species. Our fossil is, however, thinner, somewhat more in- 

 flared, and the sculpture of delicate concentric lines is more ele- 

 gant ; the umbones are nearly smooth but the concentric lines 

 elsewhere are raised and sharp. The hinge characters are like 

 those of M. chipolana. Length of largest shell 9.50, altitude 6, 

 semidiameter 2 mm. A smaller shell measures 7 . 10 X 4. 50 X 1 . 50. 



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



