THE FAUNA OF THE EXE ESTUARY. 



315 



ECHINODERMA. 



Ampliiura elegans. Common. 



POLYCHiETA. 



Lepidonotus clava. Not uncommon. 

 Marjiliysa sanguinea. One or two. 

 Nereis cultrifera. One. 



,, fucata. One in shell with Eiqxt- 



yurus Bernhardus. 



Nereis irrorata. One. 

 Eulalia viridis. A few. 

 Audouinia tentaculata. One. 

 Sabellaria alveolata. Very common. 

 Pomatoceros triqueter. Several. 



CRUSTACEA 



Cancer i^agurus. Small. 

 Portunus puber. A few. 

 Porcellana platycheles. Common. 



Pagurus Bernhardus. 

 Gnathia maxillaris. 

 Idothea balthica. 



Small, common. 



MOLLUSCA. 



Mytilus edulis. Young, very common. 

 Kellia suborbicularis. One. 

 Saxicava rugosa. Common. 

 Pholas dactylus. Common. 



„ parva. Common. 

 Patella vulgata. Very common. 



Trochus cinerarius. Shells. 

 Rissoa parva. One. 

 Purpura lapillus. Very common. 

 Buccinum undatum. Shells. 

 Cyprsea europcea. A few. 



POLYZOA. 



Membranijjora niembranacea. 

 Busula turbinata. Common. 



Common. 



Blennius pholis. Common. 



PISCES. 



Ammodytes tobianus. One. 



Station 19. EXMOUTH DOCK. 



As the Dawn was moored in Exmoiith Dock opportunities were 

 constantly offered for observations on the fauna there found. The 

 dock gates are opened daily, generally about an hour before high water. 

 The dock itself being small, the water in it is in this way very 

 frequently changed, and a considerable number of animals flourish 

 in the sheltered situation which it provides. During the present 

 summer one of the most interesting features of this dock fauna was 

 the immense profusion of the Ascidian Cio)ia intestinalis, which covered 

 the wall and piles underneath the Engineering Company's stage on the 

 eastern side of the dock. The two walls immediately inside the dock 

 gates were also covered with these Ascidians (cf. also p. 330). The 

 Polyzoan Bugula turbinata covered the bottom of the Dcmn and other 

 boats which remained in dock during the summer, and considerable 

 numbers of Ascidiella aspcrsa and Ciona intestinalis were found in the 

 same situation. 



