80 Annals of the, South African Museum. 



GEN. ALPHEUS, Fabricius. 



1798. Alpheus, Fabricius, Suppl. Ent. Syst., pp. 380, 404. 



Notice has been already taken of this genus in the General 

 Catalogue, South African Crustacea, part 5, 1910. The litera- 

 ture discussing it is very extensive. 



ALPHEUS NOTABILIS, n. sp. 

 Plates LXXXIV., LXXXV. 



The interesting specimen here described, besides being solitary, 

 was without flagellum to the second antennae, had only one member 

 of the first pair of peraeopods, neither of the second pair, and only 

 one representative for each of the three following pairs. All the 

 limbs were detached, but as there was no other specimen in the 

 bottle there can be no reasonable doubt that the lirnbs belonged to 

 the body which they accompanied. 



The rostrum protrudes from between the raised and distally 

 rounded eye-lobes and its carina is continued along two-thirds of the 

 carapace. The covered eyes are dark and sub-rotund. In the first 

 antennae the second joint is nearly as long as the first and two and 

 a half times as long as the third ; the shorter flagellum has its 

 thickened part about half as long as its slender companion, with a 

 slender 12-joiuted continuation equal to nearly a third of the pre- 

 ceding length ; this is composed of 26 joints, only the last of them 

 having a freely projecting tip, which carries two long sensory 

 filaments, 19 pairs of filaments being distributed over 9 joints. The 

 well-marked apical tooth of the bent and strongly plumose scale of 

 the second antennae just reaches the apex of the plumose portion. 



The incisor process of the mandible has one rather large tooth 

 between three or four much smaller teeth above and five very 

 minute ones below; the powerful molar is fringed with combs or 

 brushes of hair-like teeth ; the palp with seta-fringed second joint is 

 bent as usual on to the inner surface of the mandible. The palp of 

 the first maxillae has a bilobed apex, with a single spine on the tip 

 of the inner lobe. The corresponding joint of the second maxillae is 

 small with a spinule at the narrow apex and a few setae low down 

 on the outer margin. In the slender terminal part of the endopod 

 of the first maxilliped the jointing is obscure. In the second 

 maxillipeds there is a very large branchial plate attached to the first 

 joint, the second and third joints are completely coalesced, the part 

 representing the third joint being distally expanded, the sixth is 



