LITTORAL BRACHYURAN FAUNA 

 OF THE GALAPAGOS ARCHIPELAGO 



(Plates 49-87; 1 Text Figure) 



By John S. Garth 



Research Associate 



Allan Hancock Foundation 



The University of Southern California 



INTRODUCTORY REMARKS 



The present study is essentially a report on the brachyuran Crustacea 

 obtained in the Galapagos Islands by the Allan Hancock Expeditions of 

 1932, 33, 34, 35, and 1938. However, Velero III collections were found 

 to represent so large a proportion of the known insular fauna that the 

 scope of the work has been expanded to include references to the re- 

 mainder, albeit without descriptions or figures which would have had to 

 be duplicated from other sources. 



It was thought that by publishing several short papers containing 

 descriptions of new species as rapidly as discovered the work could be kept 

 current and tedious descriptive material could be avoided at this 

 writing. However, it has been found necessary in the interest of taxonomic 

 clarity to designate as new one species in addition to those included in 

 Rathbun (1933, 1935), Garth (1939), and Glassell (1940). Supple- 

 mentary descriptions are given of two species previously known from one 

 sex only and of one species heretofore represented solely by immature 

 specimens. Several species known previously from unique types are listed 

 in numbers and from several localities within the islands. A total of 44 

 species, 32 genera, and 5 families of Brachyura are recorded for the first 

 time from the Galapagos area. New information on range, habitat, depth, 

 variation, and relationship is presented concerning the 102 species, 77 

 genera, and 15 families represented among the nearly 15,000 specimens 

 obtained by Velero III collectors, which with the 18 species of 10 genera 

 not encountered by Hancock Expeditions increases the known Galapagos 

 brachyuran fauna to 120 species, 87 genera, and 15 families. 



Excluded from the present paper and from the above compilation are 

 larval forms and species which, because of the depths at which they were 

 taken, belong in the abyssal rather than in the littoral benthos. The latter 

 include Rochinia cornuta (Rathbun), R. vesicularis (Rathbun), and R. 



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