Erythrcean Molluscan Fauna. 195 



History Society in January 1896, with a supplement published 

 a few months afterwards *. The main list contains 547 

 names, the appendix 57, making a total of 604. 



A considerable residuum, however, existed undifferentiated, 

 and tliis has been kindly placed by Commander Shopland in 

 my hands for examination. 



I do not propose within the limits of the present paper to 

 do more than describe and figure certain new forms, in the 

 hope that in due time the catalogue just mentioned will be 

 still further amplified and extended by its author, so as to 

 include all additions to date. By thus doing, 40 or 50 more 

 names could now be added, making the very respectable total 

 of over 650 species. 



In the meantime it may be well, at the outset, to touch 

 briefly on the fauna of Aden and contiguous seas, so as to 

 present at a glance a resume of the work already done, and a 

 record of the investigators who were chiefly instrumental in 

 carrying out the task of elucidating the varied forms of marine 

 Mollusca native in the lied Sea and off the Arabian coasts. 



The names of Niebuhr (1761), Forskal (1771), Brocchi 

 (1819),Savigny (1825), Ehrenberg and Hemprich (1820-31), 

 and Biippell (1828) stand out prominently as the pioneers of 

 investigation in Egypt, Suez, and the Red Sea, and they in 

 turn were followed by Laborde and Linantf (1830), L. Pfeiflfer 

 (1846), Jonas (1846), Vaillant (1865), and E. von Martens 

 (1866), the latter describing the collections made by the well- 

 known Eastern traveller Dr. E. Schweinfurth two years 

 previously in the Red Sea. 



Especial mention must be made of Arturo Issel +, in whose 

 enumeration of Erythraean Mollusca 573 recent species, in- 

 cluding many novelties, which are mostly figured, are given. 

 A separate catalogue embraces the fossil forms. An appendix 

 containing the recent species quoted in Paetel's Berlin Cata- 

 logue as natives of the Red Sea, not, however, found by Issel, 

 is printed, giving 67 additional names, thus forming a grand 

 total of 640. 



This, curiously enough, almost exactly tallies with the 

 number, as given above, in Commander Shopland's Aden lists, 

 a coincidence which may be significant, as tending to show a 

 probable equalization, numerically speaking, in both centres 

 of investigation, i. e. the Red Sea without Aden, and Aden 

 and the contiguous shores of the province of Yemen. 



* T. c. pp. 503, 504. 



t ' Voyage de I'Aiabie Petree ' : Paris, 1830. 



X ' Malacologia del Mar Rosso, ricerche zoologiche e paleontolo- 

 giche di A. Issel ' : Pisa, 1869. 



