

AMERICAN SPECIES OP VERTIGO. 87 



and Jamaica, have not been satisfactorily differentiated. Un- 

 til sufficient material is brought together for definite con- 

 clusions the whole may be referred provisionally to V. ovata. 



A bleached Vertigo from Santo Domingo, collected by W. M. 

 Gabb, measures 1.9 x 1.2 mm. There is a suprapalatal tubercle 

 but no other accessory teeth. The surface is distinctly, finely 

 but not sharply striate, but otherwise agrees with ovata 

 (pi. 13, fig. 13). 



Three specimens from Humacao, Porto Rico (pi. 13, fig. 16), 

 similar to V. ovata in color and surface, are small, length 1.7, 

 diam. 1.15 mm., with 4% whorls. There are weak infra- 

 palatal nodules in two of them, all having a suprapalatal. 

 None has an infraparietal lamella. Possibly this and the pre- 

 ceding forms are separable as subspecies, but the material seen 

 is insufficient for a decision. 



The J. B. Henderson collection contains a Cuban specimen 

 of V. ovata, received from Poey through Gill, 2.1 x 1.36 mm., 

 having a minute suprapalatal but no other accessory teeth. It 

 does not differ from many northern examples. 



Pupa hexodon is not known to me by Jamaican specimens. 

 In the description, repeated below, there is nothing to dif- 

 ferentiate it from six-toothed individuals of V. ovata. 



Pupa hexodon (C. B. Adams). " Shell ovate; brown; 

 smooth and shining; spire with convex outlines; whorls 5, 

 rather convex, with a well impressed suture; aperture semi- 

 oval, with the transverse lip rather oblique, constantly with 

 six teeth, of which two are on the transverse lip, the inner one 

 being a little larger; two teeth are on the columella, the 

 upper one being a little larger, and on the outer lip are two, 

 of which the lower one is a little larger ; umbilicus very small. 

 This species resembles P. ovata Say. Length .085 inch, 

 breadth .055 inch" [about 2.12x1.4 mm.] (Adams). 



Jamaica, C. B. Adams. 



Pupa hexodon C. B. ADAMS, Contributions to Conchology, 

 no. 3, p. 37. SHUTTLEWORTH, Diagn. n. Moll., no. 6, p. 145. 



Vertigo neglect a Poey (pi. 13, fig. 11). Shell dextral, 

 rimate-perforate, ovate, very delicately striate, thin, pale 

 brown; spire conic, obtuse; whorls 4%, convex, the last ex- 



