Contributions to the Crustacean Fauna of South Africa. 399 



pleopod 2-jointed. Outer rami of 4th and 5th pleopods membranous, 

 2-jointed. Seventh peraeon segment with median process in $ , 

 with or without in 5 . Telson with a notch widening anteriorly 

 in $ , in 5 entire. Uropods lamellate, at least in $ . Mouth parts 

 in ? not metamorphosed. Marsupial plates overlapping in middle 

 line. Development in internal pouches. 



Separated from the following genus, Sphaeramene, by the process 

 on 7th peraeon segment and the lamellate uropods, which latter 

 character connects it with Isocladus. 



PARISOCLADUS STIMPSONI (Heller). 



(Plate XXXII. G.) 

 1843. Spliacroina perforata, Krauss, Siidafr. Crust, p. 65 (non 



M. Edwards). 

 1866. ,, stimpsoni, Heller, Novara Crust, p. 139, pi. 12, 



fig. 10. 

 1905. Exosphaeroma ,, Hansen. Q. ,T. Microsc. Sci. vol. 49, 



pt. 1, pp. 116, 118. 



1910. ,, (?) ,, Stebbing, Gen. Cat. S.A. Crust. 



p. 428. 



Heller's concise and clear diagnosis makes the identification of 

 specimens an easy matter. But whereas his description of the 

 telson and the process on the 7th peraeon segment applies to the 

 female, his figure evidently represents a male. It would seem that 

 the specimens in the Copenhagen Museum (if correctly named), 

 which Hansen has seen, must be all females, since if he had seen 

 the male he could not have assigned this species to Exosphaeroma. 

 Stebbing accepts Hansen's opinion, but draws attention to the 

 inconsistency of placing this species in the genus Exosphaeroma 

 as defined by Hansen. 



The transverse rows of tubercles on the peraeon segments are 

 not present in Heller's specimens. And indeed these are very 

 variable, being sometimes quite obsolete, sometimes (especially in 

 specimens from False Bay) very distinct ; the posterior ones being 

 always more distinct than the anterior ones. The full complement 

 is 6 tubercles in a transverse row on each segment, sometimes there 

 is also a minute one on each epimeron. Two small tubercles on 7th 

 segment, one on either side of the process. 



The process on the 7th peraeon segment is apically bifid (in side- 

 view) in $ , entire in 5 . 



The epimera are not distinct from the segments, and each bears 



