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PART VI. 



CRUSTACEA OF SOUTHERN PATAGONIA. 



BY 



A. E. ORTMANN, 



Carxegie Museum, PrrrsBURCH. 



LETTER OF TRANSMITTAL. 



Sir : 



I have the honor to transmit herewith the report on the recent Crus- 

 tacea collected in Patagonia by Mr. J. B. Hatcher. 



The collection is a small one, and contains, of marine forms, only such 

 as are more or less well known, adding, however, for some of them new 

 localities on the eastern coast of Patagonia, a region that scarcely has been 

 properly investigated. 



The most valuable part of the collection consists of freshwater Crus- 

 taceans found by Mr. Hatcher in the interior of southern Patagonia : among 

 them are several very important new and rare species. 



Very respectfully, your obedient servant, 

 Arnold E. Ortmann, Ph.D 



Dr. W. B. Scott, 



Professor of Geology, 

 Princeton University. 



INTRODUCTION. 



The collections of Crustaceans made by Mr. J. B. Hatcher in southern 

 Patagonia are partly marine, partly freshwater. The following are locali- 

 ties from which marine forms have been secured : they are all close to the 

 shore, in shallow water, and are situated — with the exception of the first 

 — on the eastern coast of Patagonia. 



1. Punta Arenas, Straits of Magellan. 



2. Gallegos, at the mouth of the Gallegos River, South Patagonia. 



3. Cape Fairweather, entrance of Gallegos Bay, northern side. 



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