REVISION OF W. M. GABB'S TERTIARY MOLLUSCA 

 OF SANTO DOMINGO. 



By Henry A. Pilsbry. 



The Tertiary beds of northern Santo Domingo were first brought 

 to scientific notice by the receipt in London of a collection of fossils 

 made by Mr. T. S.Heneken/ and described by J. Carriker Moore 

 and G. B. Sowerby.^ Subsequently Mr. Heneken reported on the 

 geology and Mr. Moore on another sending of fossils.^ The Hene- 

 ken collection also served as the basis of a paper by Mr. R. J. L. 

 Guppy,^ describing further species, and for numerous notes in other 

 publications by the same author. 



William More Gabb, in the course of a geological reconnaissance 

 of Santo Domingo in the years 1869-1871, collected extensively 

 in and about the region covered by Mr Heneken 's work. His ob- 

 servations on the geology and descriptions of the fossils were pub- 

 lished by the American Philosophical Society,^ and the fossils were 

 presented to The Academy of Natural Sciences of Philadelphia. 

 Unfortunately, Gabb was not able to figure his species. The de- 

 scriptions are not always sufficiently full to insure their recognition 

 when encountered in other beds except by reference to the original 

 specimens. The progress of tropical American paleontology has 

 undoubtedly been impeded by the uncertainty attaching to many 

 of Gabb's Santo Domingan species. 



A certain number of fossils of Santo Domingo and Haiti have 

 been described or discussed by Dr. W. H. Dall, in his great work on 

 the Tertiary fauna of Florida and in the Proceedings of the U., S. 

 National Museum. Others have been published by Dr. A. P. 

 Brown and the writer in papers on fossils of the Canal Zone, Col- 

 ombia, and Haiti. 



^ Mr. Heneken 's name was spelled Heniker in the original publication. 



"^ Quarterly Journal of the Geological Society, vol. vi, 1849. 



' Same Journal, vol. ix, 1853. 



■* Quarterly Journal of the Geological Society, vol. 32, 1876, pp. .516-532. 



* Notes on the Topography and Geology of Santo Domingo. Trans. American 

 Philosophical Society, XV, pp. 49-259. Separate copies with special title-page 

 dated 1873. The exact date of pubUcation remains uncertain. Dr. I. Minis 

 Hays, Secretary of the Society, informs me that the records of the Publication 

 Committee were not preserved; but a proof of Gabb's map was exhibited at the 

 meeting of October 2, 1873. The paper was reviewed in the American Journal of 

 Science for March, 1874. It may be inferred that the work was not actually dis- 

 tributed until late in 1873 or early in 1874. In the absence of proof to the con- 

 trary, the date of the title-page may be accepted. 



Gabb described the new genera and illustrated their type species in : Description 

 of some new genera of Mollusca. Proc. A. N. S. Phila. for 1872, pp. 270-274, pi. 

 9-11, published Feb. 11, 1873. 



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