46 



Arabella (Akacoda) ikicolok, Montagu, 1802, var 

 c.4^:KrLa^A, Sclimarda. 



1802. Xereis iricolor, Montagu, Linn. Trans, vii. p. 82. 



1 86 1. Aiacodd avnthva, Schmarda, Neue wirb. Thiere. I. ij. 



p. 115, Taf. xxxii. fig. 253. 

 1865. Liiinbricoiicn'is fricoloi, Johnston, Cat. B.M. p. 141. 

 1885. Notocirnis capensis, M'Intosh, "Challenger" p. 236, PI. 



xxxvii. figs. 3, 4; PL xviiia. fig. 15. 

 1888. Maclovia <ligiintc(i, De St. Joseph, Ann. sc. nat. <S:c., 



ser. p. 230, PI. ix. figs. 92-95. 

 1901. Anicoda uienihuu Ehlers, Polych, Magellan, u. Chilen., 



p. 143, Taf. xix. figs. 1-6. 



Between tide marks at St. fames', False Bay, appartntlv in 

 considerable numbers. 



In general aspect this form closely resembles the Anihclhi 

 iricolor of Montagu. 



The head forms a blunt cone which varies in outline accord- 

 ing to the specimen, in some having a tendency to an ovoid 

 outline, whilst in others it is more elongate. In lateral view it 

 is distinctly conical. At the base dorsally are four black eyes 

 arranged in a transverse line. The central pair are usually 

 most distinct, and young examples show the eyes best. The under 

 surface of the snout is often marked by a central hollow. The 

 first (peristomial) and the succeeding segments resemble those 

 of A. iricolor, and the same may be said for the rest of the body, 

 including the feet. 



The dental apparatus (Plate iv. fig, 16,) presents the same 

 arrangement, three toothed plates being in front of the great 

 dental plate, but the size of the individual teeth in these plates 

 is considerably larger in the British forms. This is very noti- 

 ceable in the first — a single fang, and in the second. There is 

 thus a tendency to diminution. The great dental plates have a 

 more distinct, pointed process externally and anteriorlv, and 

 they are somewhat shorter than in the British type. 



The maxillae are also rather shorter, and their bases are trun- 

 cated transversely. About 6 teeth are visible at the edge of the 

 broad basal region. These teeth are more numerous in those 

 from the Channel Islands, 7 or 8 at least being present. The 

 posterior appendages articulate with the maxilhe by a broad 

 triangular process which obliquely slopes to the long appendage 

 on each side, whereas in the British this is longer and narrower. 

 Moreover, three appendages instead of two occur posteriorly, 

 the additional process being somewhat broader, sh(^rter and 

 median. 



The mandibles (Plate iv., fig. 17) ;ilso show certain differences, 

 being broader, stouter and shorter in the African, narrower and 



