THE FAUNA OF THE EXE ESTUARY. 317 



III. A Complete List of the Species Identified, with an 

 Account of their Local Distribution. 



ACTINOZOA. 



[Nomenclature : GossE, British Sea Anemoivcs and Corals.] 

 Anthea cereus (HUis and Solander). Not uncommon among 

 Orcombe Kocks. 



Actinia mesembryanthemum, MHs and Solander. Common among 

 Orcombe Kocks. 



Anemones were only found at Orcombe Eocks at the mouth of the 

 harbour. None were seen within the estuary itself. The absence of 

 Sagartia hcllis, which is so common on the mud-flats at Salcombe and 

 in the Yealm, is noteworthy, but is probably explained by the fact 

 that a stony ground, covered with a moderately thin layer of mud, 

 such as this species requires, is not met with in the Exe. 



PORIFERA. 



Halichondria panicea, Pallas. Dredged in large quantities in the 

 channel between the pier and Checkstone Ledge (sta. 14b). The 

 sponge occurred in large masses, less dense in structure and with a 

 looser and more fibrous skeleton than the variety of tbis species 

 commonly found on rocks on the shore. (See note by Mr. Bidder, p. 380, 

 to whom we are indebted for the examination and identification of the 

 specimens.) The shore variety occurred at Orcombe Eocks. 



Sycon compressum, found at Orcombe Eocks, and S. ciliatum (?) in 



Exmouth Dock. 



HYDROZOA. 



[Nomenclature: Hixcks, British Hydroid ZoojyJi tjtes.] 



Hydractinia echinata {Fleming). A colony from the dock on 

 Buccinum shell inhabited by Pagarus Bernliardus. 



Perigonimus repens ( T. S. Wright). A few colonies on the posterior 

 ends of Donac vittatus, from Polesands. 



Sertularia pumila, Linn. Common at Orcombe Eocks. 



Sertularia argentea, Pllis and Solander. Dredged in channel 

 (sta. 14b) : found on Polesands. 



ECHINODERMA. 



[Nomenclature : Jeffkey Bell, Catalogue of British Echinoderms in tlie 

 British Museum.] 



Ophiothrix fragilis {0. F. Mullcr). A few small ones dredged on the 

 sponge ground in the channel (sta. 14b). 



Amphiura elegans {Leach). Common under stones at Orcombe 

 Eocks. A few dredged on the sponge ground (sta. 14b). 



Echinus miliaris (Gmclin). One dredged in the channel off the 

 pier (sta. 14a). 



