Clare Island Survey — Marine Mollusca. 22 27 



masses of living specimens, some 64 mm. long, attached to Laminaria 

 roots were dredged in l§f. off' Annagh Island. In from 3-10 f. among 

 weeds, Clew Bay : Forbes '53. 



Modiolus phaseolinus (Philippi). (Mytilus.) W. M. E. Bare : in 4 hauls, 5-10 f., 

 a total of 1 living specimen (in 8 f.), 1 pair of valves, and 7 single 

 valves, all juveniles of small size, the largest hardly more than 1 mm. 

 long. Mature examples of this species appear to be quite rare. The 

 largest specimen I have taken on the Dublin coast, where it is not 

 uncommon in shore gatherings, scarcely exceeded 1"5 mm. in length. 



Modiolaria marmorata (Forbes). W. M. E. Bather rare. Living between 

 tide-marks, Portlea, Clare Island, and in 5 f . off the Castle and off Inish- 

 lyre; valves occasional in dredgings, 8-15 f. Some of the Inishlyre 

 specimens were of large size, one measuring 17 mm. x 9 mm. 



M. discors (Linne). W. E. Frequent, living in 5 f. off the harbour, Clare 

 Island, and in 2-5 f. in the Westport Channel ; occasional between tide- 

 marks. 



M. costulata (Bisso). M. Six living specimens dredged in 10 f. in the bay, 

 May, 1909 (communicated by Miss A. L. Massy). 



Order FSEUDOLAMELLIBEANCHIATA. 



Ostraea edulis Linne. M. E. Valves of the Oyster occurred frequently on 

 the shores of the inner islands and were dredged in the bay in large 

 numbers in 6 hauls, 16-19 f. The oyster is found, too, in a living state, 

 either native or the remains of older cultivation, in the shallow channels 

 amongst the inner islands. 



Pecten pusio (Linne). M. Bare ? In 5 dredgings, 5-16 f., 1 living and 

 5 perfect and 5 broken valves. 



P. varius (Linne). W. M. E. This is the characteristic Pecten of the inner 

 islands. Living examples of large size are abundant on the shores of 

 Annagh Island, Dorinish, Scotch Bonnet, Inishlyre, &c, and frequent 

 in dredgings here amongst the muddy channels in from 2-5 f. A specimen 

 dredged off Scotch Bonnet in May, 1910, measured 60 mm. x 54 mm. 

 Valves were taken in 6 dredgings in the open bay, 8-19 f. 



P. opercularis (Linne). W. M. E. Frequent : valves taken in 12 dredgings, 

 2-19 f., the largest 57 mm. in breadth. Living in 2 f. and in 16 f. 



P. maximus (Linne). M. E. Local. Living and well-grown specimens 

 were found to be abundant in May, 1910, in a shallow bay on muddy 

 bottom between Dorinish and Inishimmel. They were visible here from 

 our boat at low water on a calm day, and were easily fished up with an 

 oar. Valves occasional in 4 dredgings in the bay, 10-16 f. 



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