Chaster — On the MoUusca ohtained hj the R.I. A. Cruises. 29 



Las^a etjbea, Montagu, sp. {Cardkim). 



Log 9, 18, 25, 28, 35, 40, 42, 62, B, C, D, E, F. 



MoNTAcrrTA BiDENTATA, Montagu, sp. {My a). 



Logs 6, 9, 11, 12, 16, 21. 22, 24, 26, 28, 31, 33, 35, [39], 

 40, 41, 42, 55, 57, 62, 63, 64, 70, 73, C, D, E. 



Var. TEIANGTJLAEIS. 



Log 63. 



M. suBSTEiATA, Montagu, sp. {Ligida). 



Station YIII. Logs 9, 11, 18, 20, 22, 28, 33, 42, 55, 73. 

 Yalves only. 



M. i^EEUGiisrosA, Montagu, sp. (Mya). 



Logs 11, 28, 42, [55]. Yalves only. 



Decipitla oyata, Jeffreys. 



Logs 11, 12, 21, 28. A few small valves. The discovery 

 of this species off the south-west of Ireland is a matter of great 

 interest. Jeffreys found a single valve at Station 18 of the 

 " Porcupine " Expedition (outside Donegal Bay). I met with 

 a pair of valves in material from the same dredging. It cannot 

 be, as Jeffreys states, the Tellimya ovalis of Gr. 0. Sars, for the 

 latter author figures the hinge, which is of the ordinary 

 Montacuta type and very different from that of the species 

 ujider consideration. 



Lepton squamosum, Montagu, sp. {Solen). 

 Logs [62], 63. 



L. zaTiDirM, Turton. 



Logs 6, 9, 12, 21, 26, 28, 30, 33, 35, 40, 42. 



Va/r. CONVEXA, Jeffreys. 



Station YIII. Logs 11, 12, 21, 28, 30, 33, 40, 50, 63, 70. 

 Both type and variety are represented by valves only. 



L. Syxesii, Chaster. 

 Logs 11, 13. 



L. Claekls;, Clark. 



Station YIII. Logs 11, 12, 22, 28, 39, 42, 63, D. Yalves 

 only and everywhere rare. There is a considerable amount of 

 variation in the shape of the different specimens. 



L. oBLiauATTJM, Montcrosato. 



Logs 11, 42, 55, 63. A valve or two from each locality. 



