426 F. W. GAMBLE AND J. H. ASHWORTH. 



16—28 pairs of brancliial tufts^ and by the posterior portion 

 of the body being abranchiate and apodous. We have been 

 at some pains to obtain the types or specimens of this species. 

 Unfortunately the types are lost from the museums both of 

 London and Paris. We have not been able to find among the 

 large number of specimens we have obtained^ any which, 

 while agreeing in other respects, exhibit a tail of the length 

 figured by Milne Edwards. It is possible that the species 

 A. branchialis is founded upon a specimen of either A. 

 ecaudata (which it resembles in the position of the first 

 pair of gills) or A. Grubii, in which the last few pairs of 

 gills have not been formed. We have several times found 

 specimens of A. Grrubii without gills, and parapodia on the 

 last two somites, and indeed specimens of this kind belong- 

 ing to the species A. Grubii have been sent to us from 

 Paris labelled A. branchialis. It seems to us that as the 

 descriptions and figures of this species are insufl&cient to 

 enable it to be identified, and as the type specimens have been 

 lost, for all practical purposes it must be ignored. 



While working at Port Erin, Isle of Man, during Easter, 

 1897, we collected near Port St. Mary specimens of 

 Areuicola — with gills extending to the end of the body — 

 which would be called A. ecaudata by most naturalists. 

 On examination we found that these specimens could be 

 separated into two sections ; the members of one were 

 characterised by the first gill being attached to the twelfth 

 cheetigerous segment, while those of the other section had the 

 first gills on the sixteenth segment (PI. 22, figs. 3, 4). More- 

 over a careful scrutiny of the nephridiopores showed that 

 the first section had only five pairs of nephridia, but the 

 second had no less than thirteen pairs. On comparing these 

 specimens with A. Grubii from Naples, we saw at once that 

 those specimens which had five pairs of nephridiopores and 

 gills commencing on the twelfth chaetigerous segment belong 

 to this species, which had not hitherto been recorded from 

 Britain ; while the specimens with thirteen pairs of nephridio- 

 pores correspond exactly with Johnston^s description and 



