192 MARINE MOLLUSCA ; PELECYPODA. 



Fam. Mytilidae. 

 Mytilus edulis, L. Everywhere abund. 



var. pellucida, Penn. Campbeltown : Rothesay : Helensburgh(B.) : bottom 



of ' Ark ' Cumbrae (R.). 



var. incurvata, Penn. c., Kenmore, L. Fyne (K.). 

 Modiolus [ = Mytilus] modiolus, L. Very c. 



var. umbilicata, Penn. Gareloch (K.). 

 M. barbatus (L.). Scarce ; U. L. Fyne 75 f. (Hoy.): Rothesay 1. w. (Wotton): 



Dunoon basin 20 f. (M.): Machrie B. : off Pirnmill (G.). 

 M. phaseolinus(PM.). Note.; Lamlash(L.Som.): King's Cross(H.): Tarbert 



(Som : M'A.): bet. Sanda and Mull of Kintyre 19 f. (K.). 

 Modiolaria marmorata (Forb.). c. (in tests of Ascidia mentula). 

 M. discors (L.}. Plentiful among Corallina officinalis. 



var. semilaevis, Jeff. Cumbrae: Brodick in corallines (Som.). 

 [M. discrepans (Leach) [ = nigra]. Very r.; Dunoon basin 20 f. (M.) : off Mull 



of Kintyre 9 mis. 55 f. (K.).] 



Crenella decussata (Mont.). r.; Lamlash (Sm. L.): bet. Sanda and Mull of 

 Kintyre 19-25 f. : inside Sanda 25 f. (K.). 



Fam. Pteriidae. 



Pinna fragilis, Penn. [ = rudis]. Very r. ; only once at Arran (L.) : once 

 dredged by Major Martin off Largs, given by him to Rev. Dr. C. P. 

 Miles, F.L.S., by him to (Sv.), and is now in cabinet of (K.). 



Fam. Ostreidae. 



Ostrea edulis, L. Not c. 



var. parasitica, Turt. Widely dist. 

 var. hippopus, Lmk. Rothesay B. (B.) 

 var. deformis, Lmk. Not c. 



Fam. Pectinidae. 



Pecten maximus (L.). Gen. dist. and fairly c. 

 P. (Hinnites) pusio (L.). Gen. dist., but scarce. 

 P. (Chlamys) varius (L.). Valves freq., not c. living. 



var. purpurea, Jeff. Cumbrae (R.): Kyles (C.). A white form of varius 



(not nivea) occurs in Kyles (Som.), and below Carrick, L. Goil (fide P.). 

 [var. nivea, Macg. Cumbrae (Sm.).] 

 P. (Aequipecten) opercularis (L.).c. 

 var. lineata, da C. Off Craigmore (B.). 

 var. elongata, Jeff. Kilbrennan Sd. 55 f. (Mar.) 

 P. (Peplum) clavatus var. septemradiatus, Midi. Locally abund., most c. 



in d. w. 



var. alba, Jeff. Occasional, L. Fyne 36-70 f. : L. Goil 24-40 f. (M.) : Cum- 

 brae (R.) : L. Fyne (Som.). 

 var. dumasi, Payr. [ = septemradiatus, var.]- -Toward : L. FynelGf. (Som.): 



Cumbrae (R.) : L. Goil 35-40 f. (M.) : Dunoon basin 5-30 f. (C.) 

 P. (Palliolum) tigerinus, Mull. [ = tigrinus]. Widely dist. and c. 



var. cpstata, Jeff. c. with the type. 

 P. (Palliolum) incomparabilis (fiisso). [ = testae]. Very r., L. Fyne (M'A. 



N.) : one recent valve, Lamlash 10 f. (Henderson). 

 P. (Palliolum) striatus (Mull.). Gen. dist., but not plentiful. 

 P. (Palliolum) similis (LasJc.). Gen. dist. but scarce living. 



Fam. Limidae. 



Lima elliptica, Jeff. Scarce, fairly freq. in L. Fyne. 

 L. subauriculata (Mont.). Not c. 'living ; L. Fyne (M'A.), Tarbert 40 f. (d.) 



