22 26 Proceedings of the Royal Irish Academy. 



Nucula nitida &. B. Sowerby. W. M. Local : taken in 6 dredgings, 8-19 f., 

 but occurring in 4 of these only as single valves. Laving, 21 specimens, 

 in 8 f., and 1 in 19 f. 



Order FLLIBEAXCHIATA. 



Anomia ephippium Linne. W. M. E. Common, living, all round the shores 

 of the bay ; immature valves frequent in almost all dredgings from 

 4-19 f. At low water on the inner shores of Dorinish in May, 1910, this 

 species was found to attain to a large size. One living specimen found 

 growing here on the shell of a living Peeten varius measured 3 inches 

 1 76 mm.) in its longest diameter ; many others reached to fully 2^ inches 

 (64 mm.). 



A. patelliformis Linne. E. Eare ? Under stones at low water, Armagh 

 Island B. LL Praeger) : probably frequent, but overlooked. 



Area tetragona Poli. TV M. Eare. A Hving specimen measuring 19 mm , 

 x 11 mm was found by Miss Stephens in a rock-pool at Portarriv, 

 July, 1910, embedded in a thick slab of Lithopliyllum incrustans and 

 associated with Saxicava rvgosa and KtlUa. suborbicularis. Valves to the 

 number of 20 were taken in 5 dredgings, 8-19 f. 



Pectunculus glycimeris < Linne I. W. M. Frequent : in 5 dredgings, 5-21 f., 

 a total of 12 living specimens and 10 valves. Living in 3 hauls in from 

 oj-21 f. Of 6 living specimens taken in one of these hauls, 4 exceeded 

 60 mm. in their longest diameter and one measured 6S mm. x 67 mm. 



Mytilus edulis Linne. W. M. E. Common all round the bay ; valves dredged 

 in from 8-21 f. 



Modiolus adriaricus i Lamarck). (Myti! ; .» M. Very rare: in 2 dredgings 

 only, one in 7 f., the other in oj-ll f., a total of 3 valves and 2 fragments. 

 The longest valve was 7 mm. x 45 m.m. 



M. modiolus (Linne). (Mytilus.) W. M. E. Frequent : living at low water 

 amongst the inner islands and in dredgings in from 1-5 f., but of 

 small size for the species, the largest taken (on Laminaria roots off 

 Annagh Island) measuring only 63 mm. Valves occasional in the bay 

 in from 8-19 f. and small living specimens here and there on the E. and 

 S. shores off the island. 



A living specimen dredged in about 2 f. off Annagh Island contained a 

 living egg-bearing female of the Pea Crab (Pinnotheres Pisum) with a 

 carapace measuring 7"5 mm. 



M. barbatus (Linne). (Mytilus.) E. Common, living, and of large size, 

 at low water on stones and on bivalve shells amongst the inner islands, 

 as at Annagh Island, Scotch Bonnet, Dorinish, and Inishimmel. Large 



