JONES : MOLLUSCA FROM GLENGARIFF. 289 



The little stream mentioned above is only three or four feet wide, 

 and perhaps two or two-and-a-half feet deep, and in it the molluscs 

 are only to be found in the two hundred yards or so nearest to the 

 Glengariff River, where the rivulet runs through almost flat meadows. 



There are no Unios in the Glengariff River itself at this point, 

 although in the stream they are exceedingly abundant. 



The neighbouring Irish capture these mussels by inserting a thin- 

 pointed stick between the open valves, on which the mollusc at once 

 closes them, and is then easily withdrawn from the bed of the stream, 

 clinging tightly to the switch. 



The specimens here obtained are rather small and of an elegant 

 shape, with somewhat thin shells. Pearls are said to be rare in shells 

 from this locality, which may account for the abundance of the mussels. 



Pisidium hibernicum. — A few small specimens were found in 

 Lough Nagarriva, where they appeared to be climbing on weeds. 



P. pusillum. — This species was taken in considerable numbers 

 at the Loughs of Avaul, on the road to Castletown, and about four 

 miles from Glengariff. It also occurred sparingly in Coomerkane 

 Lough, a partially-drained lake at tlie head of the valley of the same 

 name. 



P. nitidum. — This species was only obtained in Little Lough 

 Avaul, the nearer of the two small lakes to Glengariff. It was not 

 plentiful. 



P. obtusale. — A very oval form of this species was sparingly taken 

 from a small peaty pool on the road to Lough More. 



P. Steenbuchi. — This species was found very abundantly in a 

 small wayside pool in the Coomerkane Valley. This pool was not 

 more than six feet square, and besides the Fisidia, contained a quan- 

 tity of Algce and innumerable tadpoles. 



P. lilljeborgi. — This species was found very abundantly at 

 Lough More. 



P. casertanum. — This species occurred with the last at Lough 

 More, but was not nearly so common there. 



All the above species were found in the sub-division of West Cork, 

 except Lim?icea prcctenuis and Pisidium hibernicum, which were taken 

 in South Kerry. 



Pisidium obtusale, P. lilljeborgi, and P. steenbuchi have not pre- 

 viously been noted in West Cork. P. lilljeborgi has previously only 

 been taken in the north-west of Ireland ; and P. steenbuchi not nearer 

 than Co. Clare. 



