424 AuGüSTA Rücker, 



3. Second metatarsus witli two of tliese hairs wliich arise one 

 on the Upper and one on tlie posterior or onter surface. 



4. Tlie first metatarsus lias only one tactile oi'gan which is 

 situated near its distal end on the anterior surface. 



5. The tibia possesses one of these tactile organs on its outer 

 surface and about one third of its length from the distal end. 



6. The third metatarsal Joint bears on its outer surface, near 

 its distal end, the large flat and hollow seta. 



7. Bifurcated hairs are present on both tarsus and first, second, 

 and fourth metatarsus. I was able to distinguish on one specimen, 

 which was particularly favorable, four bifurcated hairs, three on 

 the inner surface and one on the upper surface of the terminal Joint 

 of the tarsus. 



8. The metatarsus of the last leg has the hollow stiff sen- 

 sory seta. 



Abdomen. Two pairs of lung sacs are found on the ventral 

 surface of the fourth and fifth Segments of the abdomen. Eight 

 hairs, instead of six, are present on both segments, but on the fourth 

 they are crowded close together in two groups of four hairs each, 

 which act as a protection over the slits of the lung sacs. In the 

 fifth Segments there are two groups, each of three hairs, which act 

 for protection, while to the outside and in line with these is a fourth 

 hair. The ventral surface of the sixth segment has eight hairs but \ 

 uo trace of lung sacs. 



Reproductive Appendages. In reality these appendages j 

 first make their appearance at this stage, since the appendages which i 

 appeared in the preceeding stage were nothing more than slight , 

 flaps over the orifice of the lung sacs. There is very little to these ^i 

 external organs. for the second segment, simply a pair of small flaps i 

 with a papilla-like tip. These appendages possess two setae each, ; 

 at the point where they have their origin from the body wall. The ] 

 third segment has just underneath and on a line with these small i 

 triangulär projections of the second segment, a pair of shght \ 

 papillae — so slight that in a distended specimen they disappear — ti 

 each tipped with a small seta. ! 



Flagellum. Of this appendage a description must be given j 

 from observations made on only one specimen. The flagellum has i 

 twelve joints ; the second, third, fourth, sixth, eight and tenth joints j 

 have the regulär whorls of smooth setae; all of the joints, save the ) 

 first, have the one whorl of plumulose setae. I was rather surprised 



