3i8 



DISCOVERY REPORTS 



pleopods and, if it were not for the absence of epipods, would be regarded as an Axiid. 

 Species B.R. XI has lost the exopods from all the legs, and so has gone further in 

 reduction than any known Callianassid. It has also a very remarkable character, namely 

 the rudimentary endopod of maxillipede 3, seated low down on the basis, a character 

 which I supposed was confined to the Upogebiidae, Laomediidae and Anomura. If it 

 is properly placed among the Axiid-Callianassid group this character ceases to have the 

 systematic importance I have attached to it. 



Group II A 



Telson of "A" type with four pairs of pleopods. 



Exopod of leg 5 reduced or absent 



Thalassinid D. X (Figs. 18, 19) 



Discovery St. 690. 



Rostrum 4-2 mm. ; body 9-94 mm. 



Rostrum long, slender, with long narrow smooth distal part. Carapace with small 

 spine at anterior angle and few marginal teeth. Abdomen : somite 2 with dorsal spine 

 longer than somite 3 ; somites 3-6 slightly ridged, with small spines. Pleura all rounded. 



Fig. 18. Thalassinid D. X. St. 690. 

 a. Side view. b. Telson. c. Palp of maxillule. 



