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PROCEEDINGS OF THE NATIONAL MUSEUM. 



vol. 59. 



d'Orbigny. If the very young are compared with the figure of 

 P. dubius it will be seen that they are very like that figure, and when 

 a comparison of the magnification of the figures of the two species 

 is made it will be seen that this is probably a correct solution. Proteus 

 is a well-chosen specific name, for some specimens were seen where a 

 nearly complete specimen was growing directly from another, and 

 various outgrowths are common. 



Specimens were common in Montego Bay at stations 3, 4, 5, and 

 6. D'Orbigny's specimens were from Cuba and Jamaica. 



PENEROPLIS DISCOIDEUS Flint. 



Plate 18, fig. 20; plate 19, figs. 1-3. 



Peneroplis pertusus (ForskAl), var. discoideus Flint, Ann. Rep. IT. S. Nat. Mut., 

 1897 (1899), p. 304, pi. 49, figs. 1, 2.— Cushman, Publ. 291, Carnegie Inst. 

 Washington, 1919. p. 69. 



Specimens of this species were obtained at Montego Bay at station 4. 

 It is found also as a fossil species in the West Indies in the Miocene of 



13 14 15 16 



Figs. 13-16.— Peneroplis proteus d'Orbigny. Specimens from 6 fathoms, Montego Bay, 

 showing different forms of this species. x 50. 



Santo Domingo, and deserves to rank with the other species of the 

 genus. 



Genus ORBICULINA Lamarck, 1816. 



ORBICULINA COMPRESSA d'Orbigny. 



Plate 19, figs. 4-6. 



Orbiculina cotnpressa d'Orbigny, Foram. Cuba, 1839, p. 66, pi. 8, figs. 4-7. — 

 Cushman, Publ. 291, Carnegie Inst. Washington, 1919, p. 70, pi. 7, fig. 6. 



There seems to have been a misunderstanding of this species, for 

 it is very distinct from 0. adunca. Brad} f remarks about this species, 

 which he places as a synonym of 0. adunca, as follows: 



He [d'Orbigny] stops short, however, at the spiral varieties, and fails to perceive 

 how slight is the modification involved in the addition of a few annular chambers to 

 the already nearly discoidal shell, and distinguishes the circular or nearly circular 

 specimens by a separate name, Orbiculina compressa. 



