306 PROCEEDINGS OF THE ACADEMY OF [PaRT II 



Some years ago Mr. Charles W. Johnson and the writer under- 

 took to supplement Gabb's work by the preparation of figures of 

 his type specimens with notes on these and other specimens con- 

 tained in his collection. The work was interrupted by Mr. John- 

 son's removal to Boston, and its completion, devolving upon the 

 senior author alone, was delayed by the pressure of other duties. 

 The paper was finally submitted to the Academy for publication 

 February 27, 1917,« Under existing conditions prompt publication 

 could not then be made, so that an extract containing descriptions 

 of new species was pubHshed.'' Meantime, Miss C. J. Maury had 

 issued the text of a report on the geology and paleontology of Santo 

 Domingo,^ anticipating the appearance of our paper by a few days. 

 Having access to a partial set of Gabb's specimens, Miss Maury, 

 with great enterprise, anticipated our revision by renaming certain 

 of the Gabb species having invalid names, and described others 

 from his collection. In now publishing our notes and figures, such 

 synonymy as was obvious in looking over Miss Maury's work has 

 been noted, and some paragraphs which now appear superfluous 

 have been deleted; otherwise the paper is left as originally written.^ 

 When a critical comparison of the Gabb and Maury specimens can 

 be made doubtless some further cases of identity will be apparent; 

 but it is clear that each collection contains many species not in the 

 other. It is an evidence of the remarkable richness of the faunas. 



Gabb had selected a type series of his fossils. In a few cases 

 which we have noted below, his trays contained more than one 

 form, but practically all of the species described by us as new were 

 shells which Gabb had determined incorrectly, others which he had 

 set aside as duplicates; or they were selected from packages which, 

 from their condition and the dates of newspapers used as wrappings, 

 apparently had not been opened since they were packed in Santo 

 Domingo. 



« Proc. A. N. S. Phila., 1917, p. 82. 



^ New Mollusca of the Santo Domingan Oligocene, by H. A. Pilsbry and C. W. 

 Johnson. Proc. A. N. S. Phila., 1917, pp. 150-202. The separate copies were 

 dated May 4, but on the reverse of title-page of the Proceedings the date is given 

 as May 5, 1917. 



* Santo Domingo Type Sections and Fossils. Bull. American Paleontology, v, pp. 

 1 -120 March 31, 1917, pp. 121 - 2.51, April 20,1917. The plates appeared May 

 29, 1917. 



^ Certain recent changes in generic nomenclature might have been adopted, 

 but it seemed better to leave the latter uniform with our paper of 1917. The 

 valuable papers of C. W. Cooke, 1919, and B. Hubbard, 1920, were received 

 since this paper was completed. 



