Contributions to the Crustacean Fauna of Soidli Africa. 355 



with the Indian Ocean species. Further specimens are now available 

 which render possible a more complete definition of the Cape species, 

 proving that this species is distinct from any of the other species of 

 the genus. 



In the <$ previously examined the characteristic features were so 

 slightly developed that they were overlooked, but with the clue afforded 

 by the new specimens they can be just distinguished ; the two lots of 

 specimens are thus undoubtedly conspecific. In the original description 

 mention was made of the horn on the head and the 2 ocular tubercles ; 

 there is in addition a slight concavity on the 1st peraeon segment, 

 being a continuation of that on the head. In the fully developed <$ 

 there is a tubercle on either side of this hollow and also a short 

 transverse ridge-like median tubercle on the posterior margin of the 

 same segment (1st). Thus there are altogether six elevations on the 

 head and 1st peraeou segment. This is the diagnostic feature of 

 the species. 



In the 9 the median point of the head is prominent and margined 

 but not upturned ; behind it is a very shallow median longitudinal 

 cavity. 



The surface of the body in both sexes is rather coarsely pitted, the 

 setae arising from these pits ; the pitting remains the same irrespective 

 of the setose covering. This pitting causes the posterior margins of 

 the 7th peraeon segment and 1st and 2nd pleon segments, especially 

 the lateral portions of the latter segment, to appear as if crenulate or 

 denticulate. 



The 9 is always more densely setose than the $ . 



The frontal lamina is somewhat variable in shape and proportions, 

 but appears to be at least as long as broad, usually a little longer 

 than broad, the lateral margins slightly thickened and raised, con- 

 verging to a narrow base. 



Maxilla 1 in the adult <$ and the larger $ $ is stronger, in some 

 cases very like that of zeylanica Stebb. 



The (J appears to assume its full complement of dorsal tubercles at 

 a length of about 7'5 mm. and grows to a length of 10 mm. Ovi- 

 gerous 9 9 range from 7'5 mm. to 11 mm. in length. Specimens 

 taken between tide-marks do not seem to grow as large as those from 

 deeper water. 



Colour : Spirit specimens are dull pinkish, with a few black pigment 

 specks still visible. 



Additional localities: Kalk Bay. 1 immature ^ (R. M. Lightfoot), 

 low tide. Bakkoveu Rock NW. by W., distant 2 miles. 24 fathoms. 

 1 <, 2 ovigerous $ $ ; Buffel's Bay. 30 fathoms. 1 ^ ; Cape 



