78 Annals of the South African Museum. 



PALAEMONETES NATALENSIS, n. sp. 

 Plate LXXXIII. 



The dorsal teeth of the carapace are eleven in all, three behind the 

 base of the orbit, followed by seven in close succession on the 

 rostrum, but the two foremost more widely spaced than the rest, 

 and finally a longer interval leading to a denticle just in advance of 

 the apex ; the three ventral teeth nearly correspond in position with 

 the dorsal three behind the denticle. The sixth pleon segment is 

 much longer than the fifth. The telson is nearly three and a half 

 times as long as its greatest breadth, narrowing evenly to a shallowly 

 triangular apex, the median point flanked by two small spines, out- 

 side of which is a much larger pair, with a very small pair at the 

 corners similar to two lateral pairs, one about at the middle of the 

 telson's length, the other intermediate between that and the apex. 



In the first antennae the third joint is less than twice as long as 

 broad, shorter than the second, both combined much shorter than 

 the first, which has an apical tooth, the basal spine reaching little 

 beyond the middle of the joint and scarcely beyond the globular 

 cornea of the eye ; the stouter flagellum with its longer branch is 

 considerably longer than the peduncle ; the shorter branch, which is 

 also rather the stouter, is subequal in length to the part from which 

 both branches spring, and combined with that part gives a length 

 equal to the peduncle ; the more slender independent flagellum 

 equals in length the stouter in combination with its longer branch. 

 The proportions of these flagella in Palaemonetes varians (Leach) 

 and Palaomonopsis willeyi, Borradaile, differ markedly from those 

 just described. The scale of the second antennae differs little from 

 that of P. varians, the flagellum, which is incomplete, could scarcely 

 have been the full length of the body. 



The incisor process of the mandible has three unequal teeth. The 

 palp of the first maxilla is apically bilobed, with a little upturned 

 tooth or spinule on the inner lobe. In the second maxillae the 

 lacinia interna is not produced into lobes, the median lobes are 

 very slender, and the apical plate is unarmed. In the second 

 maxillipeds the second and third joints are completely fused, the 

 large sixth joint a little outflanks the large transversely attached 

 and strongly fringed seventh. The antepenultimate joint of the 

 third maxillipeds is long and curved, the exopod reaching nearly 

 to its apex. 



First peraeopods unknown ; the second have the fourth joint about 

 as long as the first three combined, considerably longer than the 



