150 TRANSACTIONS LIVERPOOL BIOLOGICAL SOCIETY. 



Puffin Island is typical — are homes of Eulalia viridis. 

 The only other rock surroundings where I have found this 

 species in any number was on rock surfaces encrusted 

 with large Balani shells, many of which being dead and 

 empty formed fairly good hiding places. 



I cannot think that its bright green colour is in any 

 way mimetic and protective as has been suggested. For 

 it is most numerous on brown Fucus-covered rocks w^here 

 green algae are conspicuous by their absence. Besides its 

 activity is incessant, and this alone prevents its enemies 

 passing it unnoticed. Protectively coloured animals as 

 far as I know, are usually sluggish in their movements, 

 as for instance VorceUana platijcheles as noted by Professor 

 Herdman. 



Family. — Tomoptet^id^. 

 Tomopteris onisciformis, Esch. 



Tow-netted off Puffin Island and Port Erin. 



Section— SEDENTAKIA. 

 Family. — OpheliadtE . 

 * Ophelia Umacina, Rathke. 



Hab : " Despatch" expedition, 1886, from 18 fms. 

 The dredge, during this expedition ("central area") 

 brought up two individuals — the only ones I have been 

 able to obtain in this district, although the species is not 

 uncommon in the stomachs of Cod. 



^Ammotrijpane aulogaster, H. Rathke. 



Hab : 3, 0, 12. Dredged from 8—21 fms. 



To judge by the great number of examples dredged at 

 each of the above stations, this worm seems to be very 

 plentiful in our local area. The great majority were 

 collected in May, and these were in all cases minute, not 

 exceeding 4 nun. in length. 



