On some South-African Phyllopoda. 7 



Total length of body from lhe frontal edge of the carapace 



to the end of the last caudal segment 30 mm. 



Length of carapace 15 — 



Greatest width of same 11 — 



Median length of same 12 — 



Length of exposed part of body 18 — ' 



Median length of exposed pedigerous part of body 9 — 



Length of caudal part of body 9 — 



AVidth of exposed pedigerous segments ........ 3 — 



Width of last caudal segment 2 — 



Length of 4th endite of 1st pair of legs 15 — 



Length of caudal filaments 15 — 



As will appear from these dimensions, and from an 

 examination of fig. 1 on PI. I, the general form of the body 

 is very slender, much more so than in the European species 

 Apus cancriformis, and even more than in . the Australian 

 species as represented by Messrs. Spencer and Hall, re- 

 sembling more in this respect the North American species 

 Apus lucasanus, Packard, or perhaps still more Apus longi- 

 cauclatus, Leconte. 



The carapace is comparatively of rather small size, 

 scarcely occupying half the length of the body, and is 

 almost circular in form, though the length somewhat exceeds 

 the width. It is but slightly vaulted, and has the cervical 

 sulcus very distinctly marked, exhibiting in the middle the 

 convex mandibular segment. The frontal part of the cara- 

 pace is evenly rounded anteriorly and rather convex above, 

 carrying on its most elevated part the eyes and the post- 

 ocular tubercle. From the cervical sulcus extends a well- 

 marked keel along the middle of the back to the posterior 

 sinus of the carapace. The latter is not very deep, and 

 quite evenly rounded at the bottom, its edges being armed 



