63 



such good work amongst the annehds collected by himself at 

 Zanzibar, and to whom the specimens had been shown before 

 then- final examination. The present examples are compara- 

 tively small — much less than those from Herm and Guernsey, 

 or even from Shetland. 



So far as can be gleaned from Stimpson's account, the same 

 form is referred to, though he places the great bristles on the 

 3rd. foot. The general description and the number of teeth in 

 the uncini agree. He found his examples at Simon's Bay, Cape 

 of Good Hope. Schmarda procured his Chcetoptenis hauiatus 

 (op. cit.) from the same bay, and though his description is lax, 

 there is little doubt, taking his figures also into consideration, 

 that he refers to the present species. He mentions that the 

 tube is constructed externally of fine sand-grains, whilst in- 

 ternally it is smooth. His figure of the animal in its tube gives 

 a good idea of the relative proportions. 



Cluvtopicnis variopcdatits is one of the most beautifully lumin- 

 ous annelids, bright flashes being emitted from the posterior 

 feet, but the most vivid phosphorescence is at a point on the 

 dorsum between the lateral wings of the tenth segment. Here 

 the copious mucus exuded by the animal can be drawn out as 

 bluish purple fire of great intensity, which besides, now and 

 then gleams along the edges of the wing-like processes and 

 illuminates the surrounding water. A very characteristic odour, 

 somewhat resembling that of phosphorus in combustion, is 

 given out by the animal during such experiments, and in this 

 connection it may be observed that Quoy and Gaimard mention 

 that an odour similar to that around an electric machine is 

 produced by luminous marine annelids. An elaborate account 

 of this phenomenon is given by Panceri,* who concludes that 

 the luminosity arises in special epithelial cells. 



The species of Clia'topfci iis stand much in need of revision, 

 and when this is carried out it will be found in all probability 

 that the species here mentioned (C. vai iopedaius) has a very wide 

 distribution and has been described under various names as 

 new species ; nor is this surprising in an annelid which frequents 

 the shores of at least three great continents, viz. : — Europe, 

 Africa, and America. 



Fam. ARICIIDJE. 



Theodisca (Anthostoma) hexaphyllum, Schmarda, 1861. 



1861. Antliostoiiui //d'avi'/>//\7//n;/, Schmarda, Neue wirb.Thiere, 

 I., II., p. 61, Taf. xxvii., fig. 217. 



Obtained between tide marks at St. James', False Bay. 



Atti d. Accad. d. Scien/e. Xapoli. 1875. 



