66 CHAS. L. WALTON AND OLWEN M. KEES. 



to assume actual identity. If the Cornish form should prove to be 

 identical with the Irish specimens considered to be H. chrysanthellum 

 by Haddon, well and good ; it is also possible that H. arenaria has a much 

 wider range. Meanwhile many identifications can only be accepted 

 provisionally. British records of H. chrysanthellum include : Fowey 

 (Peach) ; Gwyllyn Vase, Pennance, etc. (Cocks) ; Salcombe (Allen and 

 Todd) ; River Yealm (" Plymouth Marine Invertebrate Fauna ") ; 

 Isle of Man (Herdman) ; East of Ireland (Haddon) ; Firth of Forth 

 (Leslie and Herdman), etc. 



In 1907 one of us examined some twenty living specimens of Halcampa 

 collected in the River Yealm. Considerable variability was noted as to 

 incrusting sand, the retractility and size of the physa, and the colouration. 

 Lack of time unfortunately prevented any further inquiry on that 

 occasion. Recently, however, three preserved specimens collected in 

 the Yealm were examined and found to agree in all external features. 

 Sections have been cut, and the anatomical characters compared with 

 Haddon's figures of his East Irish specimens and found to be identical. 

 It is noteworthy that both Haddon and Gosse state for this species that 

 the physa is large and non-retractible, and this character should prove 

 to be a useful aid to identification. The following is a description 

 of the external characters of the specimen examined anatomically 

 (preserved in spirit) : Total length 20 mm., divided as follows : physa 

 3-5 mm. long and 3-5 mm. broad, scapus 13 mm. x2 mm., capitulum 3-5 : 

 Physa globular, delicate, semitransparent, studded with small white 

 suckers to which adhered numerous sand grains ; Scapus slightly wrinkled; 

 Disk convex, elevated, M-mark on the margin distinctly visible. 



In another specimen 31 mm. in length the physa was similar in form 

 and showed the same numerous small white suckers and attached sand 

 grains. 



IV. Halcampa arenaria, Haddon. 



This species was described by Haddon in 1886 from specimens obtained 

 from the Kenmare River, S.W. Ireland, 38-44 fathoms (1885), and 

 again, mouth of Bantry Bay, 38 fathoms (1886). We are indebted to 

 Mr. J. H. Orton for a specimen from Rum Bay, Plymouth Sound, 

 November 19th, 1910. He further provided us with some interesting 

 sketches made while the anemone was alive. In his opinion this specimen 

 was H. arenaria, and our anatomical examination has proved this to be 

 correct. The following notes describe the specimens after preserva- 

 tion. Total length 38 mm., greatest diameter of scapus 4-5 mm., of 



