412 Annals of the South African Museum. 



of the telson between the two " carinae." Heller uses the word 

 " carinae," but it would be better to say "humps," tuberculate 

 externally, smooth internally. 



In the female the tubercles on the peraeon are barely visible 

 except on the posterior segments, where they are nevertheless 

 smaller than in the male. The tubercles on the pleon are also 

 smaller in the female, and the telsonic notch is less expanded 

 anteriorly. 



Epimera not distinctly separated from segments, not keeled, the 

 inferior margins forming the outline of the animal in dorsal view, 

 epimeron of 7th segment not hidden ventrally by pleuron of 2nd 

 pleon segment. 



First antenna, 1st joint longest, 2nd joint shortest, both with upper 

 and lower margins sharply keeled, inner face of 1st joint hollowed 

 for reception of first 2 peduncular joints of second antenna, that of 

 2nd joint with median longitudinal keel, 3rd joint cylindrical and 

 slender, flagellum 8- jointed, not quite as long as 1st peduncular 

 joint. 



Second antenna reaching to posterior margin of 3rd peraeon 

 segment, 5th joint longest, 2nd and 4th subequal, 1st shortest, 

 flagellum equal to peduncle, 16-jointed. 



Upper lip distally rounded, setose, only the proximal third 

 embraced by the epistome, the proximal end of which is bluntly 

 pointed. 



Lower lip, lobes fairly elongate with rounded and setose apices. 



Mandibles resembling those figured for D. perforata by Moore 

 (Bull. U.S. Fish. Cornm. vol. 20, pt. 2, 1902, pi. 10, fig. 14) elongate, 

 cutting-edge bluntly rounded, secondary cutting-edge in left obscurely 

 bidentate, spine-row with ca. 5 spines in left, ca. 8 in right, molar 

 not prominent, denticulate, with tuft on setae on posterior margin, 

 palp slender, joints decreasing in length, 2nd and 3rd setose. 



First maxilla, outer plate with 10 spines, the inner ones denticu- 

 late, inner plate with 4 plumose setae. 



Second maxilla, outer and middle plates with 8 spines. 



Maxilliped 2nd joint elongate, 4th, 5th and 6th joints internally 

 obed. 



The mouth parts project rather prominently owing to their 

 elongate character. 



First peraeopod, 4th joint strongly produced and furry on outer 

 apex, fur on inner margins of 4th, 5th and 6th joints, thick and 

 rather long, secondary unguis not bifid, inner margin of 7th joint 

 denticulate. 



