THE BRACHYURA 
As dredging and shore collecting were of secondary importance during 
the two cruises of the “ Albatross” in the tropical Pacific, the adult Decapods 
obtained by no means represent the complete fauna of the area visited. 
Nevertheless, 136 species of Brachyura were obtained, and among them 18 
species and one genus new to science. 
The majority of the new forms are from the Caroline Islands and the 
Paumotu Archipelago, while two come from Easter Island. A remarkable 
discovery is that of a Callinectes inhabiting Tahiti and the Fijis. The genus 
is one heretofore restricted to middle America and the west coast of Africa. 
The insular species, even as observed in the young, is a strongly marked 
one. An addition to the deep-water fauna is a Scyramathia, dredged in 500 
fathoms off the Galapagos. 
A young specimen of the shore crab, Grapsus longitarsis, only 6.5 mm. 
wide, but having the form of the adult, was taken in the intermediate tow- 
net, between 300 fathoms and the surface, at station 4717, about 600 miles 
southwest of the Galapagos Islands, where the depth of the ocean is 2153 
fathoms, and where the South Equatorial Current sweeps in a northwesterly 
direction past the Galapagos towards the Mid-Pacific. It is not surprising, 
then, that this species when full grown does not inhabit the Galapagos, but 
is known to occur at the Paumotus, the Ellice, and the Hawaiian Islands. 
If this single example is representative, the species is fully equipped for its 
littoral life long before it reaches its final habitation. 
The type specimens described below are in the United States National 
Museum. 
The drawings were made by Miss E. G. Mitchell, the photographs by Mr. 
Clarence Dodge. 
