Fnrther Observatious on Koeueiiia. 433 



Fig. 23. Front view of the female appendages of K. mimhUis wbich 

 have beeu flattened through pressure (1 oc, 7 obj., 1/2 reduction). 



Figs. 24 and 25. Frontal and lateral seusory oi'gans of third 

 stage. KOH preparation (8 oc, 7 obj., 1/2 reduction). 



Plate 22, 



Fig. 26. Extended flagellum, baisam preparation, of an adult male 

 K. irhcderi (1 oc, 7 obj., 1/2 reduction). Segments 1 — 10 inclusive are 

 normal. The smootb setae are only drawn in one plane, except in the 

 second segment. This flagellum lacks the regulär joints 11, 12, and 13, 

 which are like joints 5, 7, and 9, though somewhat narrower in the per- 

 fectly normal appendage. 



Fig. 27. Flagellum of female A'. whcehri of the last stage (1 oc, 

 7 obj., 1/2 reduction). Cleaned with KOH. An air bubble was in 

 flagellum and when cover glass was accidently dropped on it, the breaking 

 took place as is shown in the figure. a) The articulating membrane which 

 doubles in on contraction ; b) the cuff that fits over the following sub- 

 Joint ; c) Seg. 7 is abnormal in that it has smooth setae, while seg. 8 

 is abnormal in that it has only two smooth setae. 



Fig. 28. Flagellum of youngest known stage of A'. icheckri. 

 The first Joint is not shown as is the case also in Fig. 27. 



Fig. 29. Last three joints of flagellum showing the usual terrai- 

 uation (1 oc, 3 obj., 1/2 reduction). 



Fig. 30. Terminal joints sometimes seen on a flagellum that has 

 sixteen joints, which this one has (1 oc, 7 obj., 1/2 reduction). 



Fig. 31. Terminal Joint showing great size and irregulär ai'range- 

 ment of setae (1 oc, 7 obj., 1/2 reduction). 



Figs. 32, 33 and 34. Cephalothoracic sternal hairs present on dif- 

 ferent individuals of both sex. 



Fig. 35. Section through terminal portion of the fourth Joint and 

 all of the fifth of a coutracted flagellum. The camera was used as is the 

 case in all the drawings and the utmost care taken with the aid of 8 

 ocular and 7 objective, to show the relative thickness of chitin and the 

 manner of union of the joints (reduced 1/2). 



Fig. 36. Section through joints 7 and 8 of a completely relaxed 

 flagellum (8 oc, 7 obj., 1/2 reduction). 



Fig. 37. The three proximal joints of a greatly contracted specimen 

 (1 oc, 7 obj.). 



Fig. 38. Posterior end of the abdomen showing the anus and the 

 three proximal joints of the uplifted flagellum. (1 oc, 7 obj., 1/2 reduction). 



Fig. 39. Side view of last abdominal segment and fii'st Joint of 

 flagellum. Through the chitinous walls of the two segments can be seen 

 the plow-share-shaped thickening of the abdominal segment and the 



