194 
Genital area and its surroundings of female, >< 150. 
Male seen from below, 121. 
Another male seen from left side, 151. 
Larva seen from above, 117. 
Larva seen from below, >< 185. Most part of the long sete of the caudal stylets and the 
hairs on the branches of the left natatory Jeg of the first pair (thus on the right side of 
the figure) and of the right natatory leg of the second pair are omitted. 
4. Spheronella paradoxa n. sp. 
Female seen from below, > 30. 
Another female with a spermatophore seen from right side and attached by its ventral 
thread to a marsupial plate, x 30. 
Male, 30. 
Ovisac, X 30. 
Hinged larva, developing itself into a male, >< 30. 
“Female pupa’ seen from below, > 30. 
Young female that has just burst the “skin of the pupa” (the shrivelled skin of the larva), 
SK a). 
Male seen from below, > 134; q. spermatothece, s. frontal thread. 
Another male seen from left side, < 134. 
The dorsal side of the head of the male shown in fig. 4i, exhibiting the hollow spaces 
beneath the skin, * 134. 
Much protruding rostrum of a male, exhibiting the mouth-border, the antenna and the ma- 
xillula with its two principal branches and the additional branch, >< 270. 
PLATE IV. 
1. Spheeronella paradoxa n. sp. (continued). 
Head of female, >< 263. 
Genital area of female, >< 220. The receptacula seminis indicated by dotted lines; the 
caudal stylets without sete. 
Free larva, >< 167. Parts of the natatory legs omitted. 
Hinged larva, developing itself into a male, > 103. Comp. pl. Ill, fig. 4 e. 
Anterior half of the cephalothorax of a larva which had been hinged a rather short time, 
> 236; s. adhesive plate. 
“Female pupa” seen from below, 170. The female develops itself beneath the larval 
skin which has shrunk extremely, and most of the appendages of which are seen: a. anten- 
nula, c¢. antenna, g. maxilliped, m. first natatory leg, ». second natatory leg, o. abdomen, 
s. adhesive plate. 
Young female that has just burst the ‘skin of the pupa” (the same animal as shown in 
pl. Ill, fig. 4¢), seen from right side, 150; s. adhesive plate. 
rather young female, seen from below, >< 88: ¢. ventral projection terminating in a thread; 
wu. the disk-like expanded end of the thread, 
