368 Annals of the South African Museum. 



Both bicarinata and japonica are stated to be very closely allied to 

 C.pilosaM. Edw. (1840, Hist, Nat. Crust, vol. 3, p. 213), and the question 

 arises whether it would be better to " lump " all the forms together, 

 with or without varietal names for the local forms, or to separate 

 them under distinctive names. At present, however, the published 

 information about all the forms is inadequate ; for instance, neither 

 Bichardson nor Thielemann have described the maxilliped in japonica- 

 It is on the form of the maxilliped and the presence of the four 

 tubercles on the telson that I have relied in assigning the Natal 

 specimens to japonica rather than to bicarinata. The variety is 

 characterised by the anterior pair on the telson being stronger than 

 the posterior pair. 



Length : $ 6'5 mm., $ 5*5 mm. ; breadth : <$ and $ 3 mm. 



Colour : In spirit yellowish, the tubercles in the adult <$ white. 



Locality : Umkomaas River N.W. by W. % W., distant 5 miles 

 (Natal). 40 fathoms. 1 adult and 1 immature <$ , 1 ovigerous $ , in 

 sponges, s.s. " Pieter Faure." 31/12/00. (S.A.M. No. A4160.) 



Geogr. Distribution : Japan and Korea, surface, 59 and 846 fathoms 

 (Richardson); Philippine Islands (Richardson) ; Japan (Thielemann). 



C. bicarinata has been recorded from the Maldive Archipelago and 

 Ceylon ; C. pilosa from the Mediterranean. 



CYMODOCE CBYPTODOMA n. sp. 

 (Plate XVI. Figs. 6, 7.) 



Body strongly convex, parallel-sided, minutely granulose, more 

 especially posteriorly, sparsely setulose, the setae mostly developed 

 on the lateral and posterior portions. Head with anterior margin 

 rounded, with a small triangular median point. Head and anterior 

 peraeon segments without additional sculpturing. Peraeon segments 

 6 and 7 with two transverse rows of small conical tubercles. 



Pleon segment 4 entire. 



Telson in with 2 subuiediau broad ridges or longitudinally 

 elongated bosses, both posteriorly truncate with the margins so 

 formed denticulate, dorsally with a median moderately sharp keel, 

 feebly denticulate, setose and in profile convex, following the curve 

 of the telson ; in 9 with 2 low rounded submedian bosses ; apex 

 deeply notched in <$ , the median lobe reaching the same level as 

 the lateral lobes, a semicircular row of granules just anterior to the 

 base of the median lobe, distal margin minutely denticulate ; in $ apex 

 feebly notched, the median lobe scarcely or not projecting beyond the 

 lateral lobes, distal margin not denticulate. 



