TANAIDACEA AND MARINE ISOPODA FROM JUAN FERNANDEZ 



537 



laterally thin and with the margin very slightly convex. The 3 following joints 

 of the peduncle increase slightly in length, so that the 5th is about 73 as long 

 again as the 3rd. First joint of the fiagellum is a little shorter than the 4th 



Fig. 6. Paranthura gracilipes. a ist pereiopod (right), seen from the anterior (= inner 

 side, X 45. b and pereiopod (right), X 65. c 6th pereiopod (rigiit), X 65. ^/ ist pleopod 

 (right), X 45- e and pleopod (right), X 45- / telson and uropods, X 34- 



joint of the peduncle. Three very minute and obscure apical joints are 

 present. The relation between the lengths of the peduncular joints and the 

 flagellum is 25:35:18:19:25:18. 



