NO. 26 



NEW MYSIDACID CRUSTACEANS TATTERSALL 



Sixth joint of the cndopod of the third to the eighth thoracic hmhs 

 (text fig. 3^) divided by a suture into two subjoints; in the third 

 limbs the proximal one is half as long as the distal and the dactvlus 



Fig. 2,.—Siriella occidcntalis, n. sp. a, antennal scale and peduncle ; b, sixth and 

 seventh joints of the endopod of a thoracic limb; c, distal extremity of the endo- 

 pod of the third pleopod of the male; d, distal extremity of the exopod of the 

 third pleopod of the male: e, distal extremity of the endopod of the fourth 

 pleopod of the male ; /, distal extremity of the exopod of the fourth pleopod of the 

 male. All X 64. 



is more than one-third but less than one-half of the length of the 

 sixth joint. 



Telson (text fig. 4a) rather narrowly lanceolate in form, three 

 and one-third times as long as broad at the base, lateral margins with 



