Mollusks. 7245 



Addenda. 



Molgula ? I dredged a species, which may perhaps be 



M. rustica, in great abundance in 1857, between Clachland Point and 

 the Corriegills. It occurred in deep water. Further observation is 

 required to identify the species. 



Pholas Candida. In "An Account of a Day's Excursion to Bute, 

 by James P. Fraser, Esq.," a short paper published in the ' Naturalist' 

 (vol. i. 1851, p. 127), I find the following reference to this shell as 

 occurring at Rothesay : — " The state of the tide precluded our getting 

 at the ground where Pholas Candida is very abundant ; but we were 

 not much too late, for one of our party, who in his enthusiasm had 

 rushed into the water, said he was standing on the bank which 

 contained them." Mr. Fraser does not appear to have procured 

 specimens, and an error may have been made with respect to the 

 species. 



Lyonsia norvegica. " Between Holy Island and Clachland Point." 

 — Greville and Miles. 



Tapes pullastra. " Holy Island, &c." — Greville and Miles. 



The following names occur in Mr. Smith's ' Catalogue,' which 1 find 

 it impossible to recognise as synonyms of our admitted species : — 

 Tellemya ovata, Brown, perhaps a form of Kellia suborbicularis ; 

 Amphidesma ovale ; Tellina punicea, exotic ; Crassina depressa, 

 fossil ? {vide Forbes and Hanley, vol. i. p. 471) ; Venus sulcata, exotic 

 {vide Forbes and Hanley, vol. i. p. 470) ; Cardium medium, exotic ? ; 

 Lima sinuosa, synonym of Lima hians ? ; Pecten medius ; Turbo oli- 

 vaceus ; Pyramis pallidula ; Cerethium elegans, exotic. 



The following in * Landsborough's Excursion ' present similar diffi- 

 culties : — Crania spiralis ; Cardium medium ; Turritella ambigua ; 

 Helix bicolor, probably one of the Skeneae ; Cerethium elegans ; Ris- 

 soa scalariformis. 



Of the Mollusca referred to in this Catalogue the following seventeen 

 may safely be considered to have been erroneously recorded as denizens 

 of the Clyde : — 



Panopaea norvegica Pecten islandicus 



Venus verrucosa Trochus exiguus 

 Astarte arctica ,i crassus 



Cardium aculeatum Janthina communis. 



Leda oblonga Rissoa abyssicola 



„ truucata Cheuanitzia clathrata 



