138 Annah of the South African Museum. 



FAMILY SYMPODOMMATID.E, n. 



Without distinct telson ; with exopods only on the first three 

 pairs of pergeopods in both sexes ; with five pairs of pleopods in the 

 male. 



SYMPODOMMA, n. g. 



General form slender, elongate, width diminishing gradually from 

 carapace to pleon. Eyelohe narrowly linguiform, separating the 

 pseudorostral lobes, in which the sinus is well defined by the pro- 

 duced antero-lateral angle. All five pedigerous segments dorsally 

 exposed, the first short. Pleon elongate ; telsonic segment produced 

 between the bases of the uropods. First antenna with both flagella 

 slight. Third maxilliped with second joint distally much produced, 

 fifth not much distally widened. First three pairs of peraeopods in 

 both sexes with exopods, fourth and fifth pairs without any. Five 

 pairs of pleopods in the male. Uropods with both rami two- 

 jointed. 



The name of the genus is compounded of the tribal name and 

 oyu^o, an eye. 



Under this genus I group the new species Sympodomma africanus, 

 and three previously known under other names : 1. S. anomalus, 

 assigned by G. 0. Sars in 1871 and 1873 with much hesitation to the 

 genus Leucon, but in 1879 and 1887, again with some doubt, trans- 

 ferred to Vaunthompsonia ; 2. S. wcberi, described by Caiman in 

 1905 as Heterocuma ? weberi, and 3. S. diomedece, the species 

 described by Caiman in 1912 as a companion of the preceding species 

 in the genus Heterocuma. 



SYMPODOMMA AFEICANUS, n. sp. 

 Plate L. 



The present species bears a close resemblance to that recently 

 described by Dr. Caiman from Japan under the name Heterocuma 

 ilimiiedecB (Proc. U.S. Mus., vol. xli., p. 612, text figs. 6-9, 1912), but 

 is distinguished by the different armature of the carapace and by the 

 proportions of the uropods. 



The pseudorostral lobes are kept quite apart by the advanced eye- 

 lobe, the slightly expanded pellucid apex of which appears to be 

 occupied by numerous small lenses ; an angular antennal sinus is 

 formed by the well-advanced antero-lateral angle, from which com- 

 mences a serration carried some way along the lower margin. A 



