Contributions to the Crustacean Fauna of South Africa. 389 



a further similar row runs along the extreme upper margin of the 

 side-plate. 



Assuming that these two rows are absent in the Mediterranean 

 form, this feature and the conical processes on the posterior margin 

 would seem to be a valid reason for giving a varietal name to the 

 South African form. 



Eyes subtrigoual rather than oval. 



Flagellum of antenna 2-3-jointed ; 3rd joint very small, without 

 any row of denticles along the lower margin. In Koehler's specimens 

 the flagellum was serrulate. 



Four pairs of marsupial plates, that on the 1st segment very 

 distinct and almost as large as those on segments 2 and 3, which 

 have probably not reached their full development, that on segment 4 

 also not fully developed since in the anterior part they scarcely meet 

 in the middle line, but posteriorly they are fused in the middle line 

 so that the presence of an inset-piece is not determinable. 



The specimen contains several irregular masses of yolk-granules 

 representing maturing ova, and shows in the appendages the new 

 skin developing under the old, so that the next moult will see the full 

 development of the marsupial plates. 



Length: 7'5 mm. ; breadth: 1mm. 



Colour: In spirit yellowish, eyes reddish. 



Locality: Umkomaas Eiver, NW. by W. W., distant 5 miles. 

 40 fathoms. 1 uouovigerous $ on the G-orgonaceau Villogorgia 

 mauritiensis Eidley. s.s. " Pieter Faure." 31/12/00. (S.A.M. 

 No. A4144.) 



Geogr. Distribution: Villefranche, Mediterranean (Koehler). 



GEN. AECTURELLA Sars. 



1897. Ardm-ella Sars, Crust. Norw. vol. 2, p. 92. 



1904. Norman, Ann. Mag. Nat. Hist. (7), vol. 16, p. 448. 



1908. Stebbiug, S. A. Crust, pt. 4, p. 51. 



1911. Koehler, I.e. pp. 4, 39. 



1911. Arcturopsis id. ibid. p. 8. 



Reasons have already been given for merging Arcturopsis in the 

 earlier Arcturella. There seems to be no essential difference between 

 them unless one considers the relative lengths of the 4th segment in 

 the male ; in A. dilatata and danmonensis it is not longer than the 

 rest of the body posterior to it, though it varies somewhat, being much 

 shorter in the former, but in the latter only a little shorter, or even, 

 in one Plymouth specimen I have seen, equal to the rest of the body 



