igiS. Phillips & Stelfox. — Range of Pisidiimi hibernicttm. 49 



Loc. — In shell-marl from site of old lake near Legacurry, Hillsborough. 

 Coll. — Per N.H.F., 1910. Alt. — About 200 ft. Assoc. ^ — P. nitidum 

 and P. milium. Remarks — P. ohtusale, fide Mr. B. B. Woodward, 

 See Cat., p. 126. 



Antrim. 



Loc. — In shell-marl from Magi aberry (near Moira), on site of old lake. 

 Alt. — About 70 ft. Assoc. — P. nitidum, P. milium, P. suhtruncatum 

 and P. ohtusale. Remarks^ — Recorded by Messrs. Kennard and Wood- 

 ward as P. ohtusale. See Proc. Geol. Association, vol. xxviii., p. 146. 



DESCRIPTION OF PLATES. 



Plate I. 



Figs. 1(7 and ih. — Siphon and posterior lateral teeth of hinge of P. nitidum 



Jenyns { = P. pusillum, B. B. Woodward, Cat., pi. i, fig. 8), from 



Dick's Hole, Hillsborough Demesne, Co. Down. 

 Figs. 2fl and 2b. — Do. of P. hihernicum West., taken in association 



with the last. 

 Figs. 3fl and 36. — Do. of P. ohtusale (Lam.) Jenyns, from a disused 



mill-race a few yards from the above habitat. 

 Figs. 4fl and 46. — Do. of P. personatum (Malm.) B. B. Woodward, 



taken in association with the last. 

 [The siphon of P. milium Held is not figured : it is somewhat like 

 that of P. ohtusale, but is much longer and very narrow. The posterior 

 laterals of P. milium are similar in some ways to those of both P. nitidum 

 and P. hihernicum and are not figured in consequence.] 

 Figs. 5 and 6. — Interior view of pair of valves of P. hihernicum from 



" Lough No. 7," 2,250 ft. alt., Coumaknock, Brandon Mt., South 



Kerry. A very thin and tumid form ! 

 Figs. 7 and 8. — Do. from Crow's Lough, near Gortymadden, South 



Galway. The most perfect specimen we have yet seen ! 

 Figs. 9 and 10.- — Do. from Lough Nagarriva, South Kerry : one 



of Dr. Scharff's original specimens. A very tumid and abnormal 



form, but unfortunately the type of the species ! 



Plate II. 



Figs. I and 2. — Interior view of pair of valves of P. medianum Sterki 



from Orchard Lake, Mich., U.S.A., for comparison with figures 



of P. hihernicum from L. Rea. 

 Figs. 3 and 4. — Interior view of pair of valves of P. hihernicum West, from 



Lough Meenaskeagh, East Donegal. 

 Figs. 5 and 6. — Do. from Lough Rea, South Galway. A thickened 



form : the nearest we have seen to the American P, medianurn 



figured above ! 



