11^ The Irish Naturalist. Oct., 



Deny and the Point of Ayre southwards, and from West 

 Ireland to the midland English counties, and at all heights 

 from the shore at Ballybrack to the Wicklow Mountains on 

 one side of the Irish vSea, and Moel Tryfaen, Gloppa and 

 other elevated sites of 1,200 or 1,400 feet on the other, it 

 will be seen at once that we are dealing with a very different 

 type of faunal life. 



The recorded species from all the above deposits number 

 about 130, of which several are northern forms, including 

 four or five not met with in the Wexford-Manx areas, 

 Cardium islandicum, Serxipes (Cardium) groenlandicus , 

 Rhynchonella psittacea, Turritella polaris, and Buccinum 

 groenlandicum. The southern species include Pecten glaber 

 (Ballybrack), and twenty-five others not met with before 

 either in \\'exford or in the Isle of Man. 



Chiton marmoreus. Isocardia cor (Balbriggan) . 



Bittium reticulatum. ^Lucinopsis undata. 



Dentalium tarentinum. ^Mactra glauca. 



Nassa pygmaea. Modiolaria marmorata. 



Rissoa memhranacea. Psammohia vespertina . 



Rissoa parva. Pholas Candida. 



Trochus cinerariiis. Pholas parva. 



Trochus magus. Sy^idosmya alba. 



Cardium aculeatum. Scrohicularia plana. 



Cardium exiguum. Tellina tenuis. 



^Diplondonta rotundata. Tapes decussatus. 



Lucina horealis. Venus gallina. 

 Lucina divaricata. 



Deducting the few exotic species mentioned above, the 

 fauna is a representative modern group of southern ten- 

 dencies, entirely different from that of the Wexford-Manx 

 deposits. 



The causation of the latter group is still a matter of 

 question. If morainic, as photographs of the Blackwater 

 chffs suggest, the question arises from whence did the 

 contained Pliocene fauna come, as there are no Pliocene 

 deposits known so far north till we come to Iceland, and 

 these are not Icelandic species, neither are there any traces 

 of them in the present Irish Sea floor. 



^ Only recorded from Worsden, in Lancashire. 



