CHASTER AND HEATHCOTE : MOLLUSCA OF OBAX. 311 



notice, these are of characteristic form. On the Lancashire 



coast both are well known, the one littoral and the other 



at depths of 15 — 20 fathoms, yet no intermediate forms 



have occurred to our knowledge. 

 Mya truncata, L. On Coram Ledge ; j'oung shells dredged 



alive. 

 Sphenia binghami, Turt. {Myabinghami). [A.M.N.] One 



dredged alive. 

 Corbula gibba, Olivi. Abundant, and of large size. A few 



examples of the var. rosea, Brown were dredged in mud off 



Lismore. 

 ** Saxicavella plicata, Mont. {Panopea plicata). A valve 



dredged. Very rare in the Clyde district (Brown). 

 Saxicava rugosa, L. The type and var. antica, L. were 



taken in Laniitiaria bases, and dredged. 



* Barnea Candida, L. {Pholas Candida). [Jeffreys.]. 



* Zirphssa crispata, L. {Pkolas crispata). [Mud under 



Dunstaffnage Head, R.D.D. MS.]. 

 Lucina borealis, L. Valves dredged. 

 L. spinifera, Mont. Dredged with moderate frequence in 



Kerrera Sound. All the specimens are of small size. 



* Tellina crassa, Penn. 



T. tenuis, Da Costa. [R.D.D.]. Young examples dredged. 



T. fabula, Gron. [A.M.N.]. A valve dredged. 



** T. donacina, L. Dead but fresh specimens and valves 



dredged off Maiden Island. 

 T. balthica, L. [Very scarce and small, R.D.D, MS.] One 



or two very young examples dredged. 



* Scrobicularia piperata, Gmel. [A.M.N. ; living on 



Coram Ledge, R.D.D. MS.]. 

 Abra alba, S. Wood. {Scrobicularia alba). Dredged alive in 



Kerrera Sound. 

 ** A. prisnnatica, Mont. Two valves dredged. 



