374 ALLAN HANCOCK PACIFIC EXPEDITIONS VOL. 5 



Remarks. — The specimens obtained by the Velero III are the first 

 since Faxon's types and include the only male specimens known. 



This species was encountered sparingly until 1938, when a dredge 

 haul made off Daphne Minor Island brought up 47 specimens. This 

 might indicate either that the channel between James and Indefatigable 

 Islands in which Daphne Minor is located may be the metropolis of 

 the species, or simply that the depth of the haul, 70-80 fathoms, is more 

 favorable than the relatively shallow depths at which most of the small 

 boat dredging was done in earlier years. 



The geographical range of E. granulata has been extended to include 

 the entire Galapagos Archipelago, and its bathymetric range from 52 

 fathoms to 150 and shoalward to 20. 



Description of the male. — The male of Euprognatha granulata differs 

 from Faxon's description and figure of the female in the following par- 

 ticulars : 



1. The ratio of length to breadth of carapace is greater, the male 

 measuring 10.0 mm by 7.7 mm, the female 7 mm by 6 mm. 



2. The chelipeds are elongated to almost four times the length of the 

 carapace, or 38 mm, in the 10 mm male above. Of this length the chela 

 occupies over half, or 18.9 mm. 



3. The ambulatory legs are correspondingly attenuated and decrease 

 regularly in length from first to last. 



4. A third median spine is present in addition to the gastric and 

 cardiac spines mentioned by Faxon and is located on the intestinal region. 



5. The pterygostomian region is tumid and is clearly visible in dorsal 

 view between the postorbital lobe and the hepatic spine. 



6. The under side of the postorbital lobe is concave. 



7. The outer maxilliped, described by Faxon only as granulated, has 

 a triangular merus sharply produced at the anterointernal angle, broad- 

 ened toward the anteroexternal angle, and but weakly grooved for the 

 insertion of the thickened and compressed palpus. The exognath is also 

 broad, particularly for its basal two-thirds. 



8. The male abdomen is widest opposite the third segment and nar- 

 rowest at the union of the fifth and sixth. The last two segments appear 

 to be fused. A well-developed median spine is present on the first segment, 

 and rudimentary spines on the following two, rather than three, segments. 



Genus DASYGYIUS Rathbun, 1897 

 Key to the Galapagos Species of the Genus Dasygyius 



A^ Carapace subglobular, rostrum bifid; first leg not appreciably 

 shorter than others; tip of male abdomen triangular 

 D. gibbosus 



