TANAIDACEA AND MARINE ISOPODA FROM JUAN FERNANDEZ 



527 



Colour slightly bluish gray; under a lens pale yellow, but strongly mar- 

 morated with dark-brown, forming a pattern of various-sized light spots. 



Antennulae about as long as carapax. ist joint about 3 times as long as 

 it is broad and 2 V2 times as long as the 2nd. The relation between the lengths 

 of the joints is 47 : 19 : 1 5 : 2. 



Antennae (fig. 2 a) as long as the antennulae without the last small joint. 

 1st joint almost as long as the 3rd, 2nd joint the longest, a little longer than 

 the 4th. The short flagellum consists of 2 small joints, together in the sub- 

 adult male about as long as the last peduncular joint. 



Maxillipeds, vide fig. 2 b. 



Clielipeds, iviniature specimen (fig. 2 c). 

 Very strong. The last 3 joints are turned 

 out a little, so as to be visible also in a dor- 

 sal view. Carpus V4 longer than wide. Pro- 

 podus only Yg as long again as it is broad. The 

 immovable finger with its base very broad, 

 much broader than dactylus. The free distal 

 margin of propodus only slightly convex. 



Clielipeds, subadult mole {fig. 2 d) have the 

 free distal margin of propodus slightly concave. 

 The dactylus is more evenly slender and, 

 near the propodus, slightly turned at an angle. 

 Its lower margin, except near the propodus, 

 is almost straight. The propodus has about 

 II setae in two groups on the distal margin 

 and about 7 on the lower margin. 



znd—'jth pereiopods. The small ischial 

 joint was only distinguishable on the 6th and 

 7th legs. 



2nd pereiopod (fig. 2 e). 6th joint distally 

 considerably decreasing in width, slightly 

 longer (about V?) than the 4th and 5th to- 

 gether and about half as long again as the 7th 

 joint, with claw. 



3rd pereiopod (fig. 2 f). 6th joint a little 

 shorter than the 4th, which is half as long 

 again as the 5th. 5th joint on the posterior 



and lower side with a distal row of 5 strong setae, of which the upper is the 

 longest. One seta is situated on the anterior side near the lower distal angle. 



^th pereiopod. Like the 3rd, but the 6th joint has only 4 setae distally on 

 the posterior side, the small lower one being reduced, but on the rostral side 

 there are instead two broad setae near each other. 



^th—jth pereiopods. 3rd joint on the 6th and 7th pereiopods small and 

 indistinctly limited. 4th joint distally with a circle of 8 broad setae. On the 

 7th pereiopods (fig. 2 g) the carpus is almost half as long again as the merus, 

 and the propodus about 7? as long again as the carpus. In the figure only 6 



Fig. I. 



Tanais (Anatanais) maniwraius, 

 subadult male, X 38. 



