208 THE FAUiNA OF THE SALCOMBE ESTUAIiY. 



Tapes pullastha, Wood. This was by far the commonest bivalve on 

 the Salstone, especially on the western shore. It was found lying on 

 the surface of the muddy gravel, or buried to a depth of three or four 

 inches. A few were found on the other grounds, but it was nowhere 

 so common as on the Salstone. 



Venus striatula, Donovan. Living specimens of this mollusc were 

 found lying on the surface of the clean sand at Gazebo and Millbay. 



Venus fasciata, Donovan. One or two were found lying on the 

 clean sand in Millbay. It is most commonly found on gravelly ground, 

 such as one finds near Plymouth, one mile west of Stoke Point. 



Venus ovata, Pennant. Only two specimens were taken — one with 

 the cheese-cloth trawl on the zostera of Salcombe estuary, and the other 

 with the dredge between Snape's Point and the mouth of the harbour. 



Cardium edule, Linnccus. Was commonest on the Salstone, lying 

 on or near the surface of the muddy gravel on the west and south-east 

 shores, and of the fine mud on the north-east. It also occurred on 

 several other grounds, especially in the Kingsbridge estuary. 



Cardium norvegicum, Spengkr. Shell dredged in Salcombe Harbour. 



LuciNA BOREALis {Linna'us). This species was found chiefly in the 

 zostera banks on the east side of the harbour between Millbay and the 

 Ferry House, one or two only being found in the zostera bank under 

 the Marine Hotel. It was always buried six or eight inches deep. 



LuciNA FLEXUOSA (Montagu). Not uncommon in the sand and zostera 

 banks between IMillbay and Ferry House, buried several inches below 

 the surface. 



MoNTACUTA FERRUGINOSA (Moutagu). This species was always found 

 commensal with Echinocardium cordatum in the clean sand at Millbay, 

 and always in the same position, i.e. in a burrow opposite the post-anal 

 impression of the Uchinocardiu7n. Each burrow contained from one to 

 six Montacuta of all sizes, generally the latter number or thereabouts. 

 The shells, especially near the umbonal regions, were coloured red by an 

 incrusting reddish deposit, consisting of organic debris, which Gwyn 

 Jeffreys thinks may be due to the fasces of the animal itself. It might 

 also be due to the fteces of the Echinocardium. In the case of some 

 specimens of Echinocardium which were obtained from the Yealm, one 

 Montacida was found adhering to one of the post-anal spines, in the 

 same way as M. suhstriata attaches itself to the spines .of Spatang^is 

 •picrpureus. 



DiPLODONTA ROTUNDATA {Montagu). Shell dredged in Salcombe 

 Harbour. 



Kkllia suborbicularis {Montagu). Was often present in dredge 

 material, generally in dead bivalve shells in which there was a deposit 

 of mud. 



