240 



D:. M. Klialil on the 



postero-lateral rays. The conimon trunk of tiie latter two 

 rays is only clivii-lcil in its terminal halt'. The two rays lie 

 close to each other ; they are plumb at the seat of bitiireation, 

 and they become suddenly constricted, terminating in fine 

 points (tig. 4). 



The externo-doisal rays arise from the common trunk of 

 the dorsal ray 0"2 mm. from its origin. These rays are of 

 practically the same thickness throughout, having blunt conical 



Via. 5. 



Fijr. 6. 



SO y" 



300 /J 



Fig. 5. — Side view of female tail. 

 Fiof. 6. — Ova. 



ends that fall considerably shoit of the edge of the bur.<a. 

 The dorsal ray is 0*53 mm. long ; it bifurcates in the ter- 

 minal O'l mm. Each branch is tridigitate. The two lateral 

 digitations lie close together, while the inner branch is widely 

 separated from the rest. 



Genital Cone. — The genital cone is elongated and is almost 

 cylindrical when viewed from the ventral or dorsal surface. 

 Viewed laterally it is cone-shaped. The length of the cone is 



