No. 10 GARTH : BRACHYURAN FAUNA OF THE GALAPAGOS 



407 



acters given by Rathbun (1925, p. 509) and requiring supplementary 

 description which can best be given by a point-by-point comparison with 

 the Atlantic species. 



In comparing the above-mentioned female of Tyche lamellifrons with 

 a female specimen of T. emarginata loaned by the U.S. National Museum 

 (Cat. No. 46770) and a male with loaned male No. 46772, the following 

 differences became apparent : 



1. The rostral horns are parallel in lamellifrons and are almost 

 joined half way to their extremities by protuberances which almost, if not 

 actually, touch one another on the midline. The rostral horns of emargi- 

 nata, on the other hand, are strongly divergent from their bases and have 

 no suggestion of such protuberances. 



TEXT FIG. 1 

 Left outer maxilliped of Tyche emarginata White 



