72 Annals of the South African Museum. 



Ampelisca and Haploops. They can easily be discarded, should 

 they through fresh discoveries cease to be useful for their original 

 employment. 



BYBLIS ANISUBOPUS, n. sp. 

 Plate XXXVI. 



The first four segments of the peraeon are short, the side-plate of 

 the first broadly produced forward with fringed margin, that of the 

 fourth segment narrowly produced backward ; the three following 

 segments are much larger. The first three segments of the pleon 

 are large, with the postero-lateral corners rounded ; the fourth 

 segment is dorsally raised in a sharp nasiform projection above the 

 compound segment which has a dorsal depression and the dorso- 

 lateral edge rounded on each side as it approaches the telson. 



The lower corneal lenses project beyond the margin of the head. 

 Both pairs are backed by dark masses of pigment, and to the rear of 

 the upper pair are also small patches of pigment, perhaps such as 

 have suggested the idea of a third pair of eyes in Ampelisca rubella, 

 Costa. 



The first antennas have a short peduncle, the joints successively 

 decreasing, with a flagellum of 17 or 18 joints, more than twice as 

 long. The second antennae are longer than the whole body, the 

 peduncle rather longer than the first antennae, the gland-cone of the 

 second joint acutely projecting, the fifth joint long, but shorter than 

 the fourth, the flagellum of about 45 joints with long setae. 



Upper lip with emargination scarcely perceptible. Spine-row of 

 mandibles containing 8 furcate spines, the right mandible without 

 accessory cutting plate. The inner plate of first maxillae with one 

 seta on each side a little below the apex ; the outer plate carrying 

 11 spines in one of the pair, but apparently only ten in the other ; 

 the long second joint of the palp having 4 spines on its indented 

 apical margin. 



The gnathopods have the usual abundant furniture of the fifth and 

 sixth joints, the fifth being considerably longer in the second pair 

 than in the first. The finger has a fringe of spinules on the inner 



margin. 



In the first and second peraeopods the fifth joint is short and 

 stout, decidedly shorter than the tapering sixth, and equal in length 

 to the finger. The third pergeopods have the second joint strongly 

 convex in front, considerably broader than long. In the fourth pair 

 this joint is but little broader than long. In the fifth pair the second 

 joint is produced nearly to the end of the fourth, behind which it is 



