Contributions to the Crustacean Fauna of South Africa. 405 



two appendages are a little distance apart, characteristic of 

 Exospkaeroma ; (2) where they are contiguous, characteristic of 

 Cymodoce and Dynamenella ; (3) where they are fused in part, the 

 only example of this case known to me being Dynoidcs serratisinus 

 n. g. et sp. (see infra). The other genera, so far as known to me, 

 can be arranged in either the first or the second group. 



SPHAEBAMENE, n. g. 



Maxillipeds with 4th, 5th and 6th joints inwardly produced. 

 Anterior peraeopods without natatory setae. Outer ramus of 3rd 

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

 branous, 2-jointed. Seventh peraeon segment without processes. 

 Telson in $ with a slit widening anteriorly ; in $ entire. Uropods 

 not lamellar. Mouth parts in 2 not metamorphosed. Marsupial 

 plates not overlapping. Development in internal pouches. 



SPHAEEAMENE POLYTYLOTOS, n. sp. 

 (Plate XXXIII. A.) 



1905. Sphaeroma (?) scabriculum, Hansen, Q. J. Microsc. Sci. vol. 49, 



pt. 1, pp. 102, 103, 116 (non 

 Heller). 



1910. Exosphaeroma ,, Stebbing, Gen. Cat. S.A. Crust. 



p. 429. 



Head, peraeon and pleon with flat-topped, button-like tubercles 

 with the posterior margins projecting freely. They are disposed as 

 follows : the head has a small rostral point, behind this 2 transverse 

 rows, the anterior ones being the larger, near the posterior margin 

 of head 2 small median tubercles, 1 large submedian and 2 small 

 ones between this and the eye. 



The first peraeon segment, which is slightly longer than any of 

 the following segments, bears 6 large tubercles with intermediate 

 smaller ones, the epimeron has 2 large tubercles, the one anterior 

 to the other. Each of the remaining peraeon segments bears 6 large 

 tubercles with 3 smaller intermediate ones, the epirnera each bear 2 

 large tubercles (except the 7th which bears only 1), the one dorsal to 

 the other, and a small tubercle on the junction with the segment. 



Whole of 1st and central portion of 2nd and 3rd pleon segments 

 hidden beneath 7th peraeon segment, which is without any pro- 

 cesses. Lateral portions of the 2nd and 3rd segments with 

 2 small tubercles. The 4th segment bears 6 tubercles, the 2 sub- 



31 



