1889-90.] 217 



Thracia distorta, Montagu. Several valves at Magheramorne. 

 They are of remarkable size ('9x1*2), these dimensions 

 being half as large again as those given by Jeffreys. 



Trochus helicinus, Fabricius. Not uncommon in the Maghera- 

 morne deposit. 



Trochus millegranus, Philippi. Several small examples at 

 Downpatrick. 



Phasianella pulla, Linne. This pretty shell is frequent in the 

 clays at Larne, Magheramorne, and Downpatrick. 



Rissoa reticulata, Montagu. Magheramorne, not common. 



Rissoa albella, Loven, var. Sarsii. A single specimen at 

 Magheramorne. 



Rissoa parva, Da Costa. Magheramorne bed, rare. Though 

 extremely abundant at the present day, it has not been 

 hitherto noticed in the Estuarine Clays, where its place is 

 taken by R. violacea. The typical form appears to be 

 very rare everywhere as a fossil. 



Rissoa costata, Adams. Kircubbin, frequent. 



Skenea planorbis, Fabricius. In the clays at Limavady 

 Junction, Magheramorne, Larne, Downpatrick, and New- 

 castle ; abundant in some of these beds. 



Odostomia nitidissima, Montagu. Two examples of this tiny 



and exquisite shell were found at Eglinton. Jeffreys says 



that it has never been found fossil. 



Several other Odosiotnice have been found, which are believed 



to be additional species ; but these are not recorded till they 



have been examined and confirmed by an authority. 



Utriculus truncatulus, Bruguiere. In the Downpatrick bed, 

 very rare. 



Utriculus obtusus, Montagu, var. Lajonkaireana. Sparingly 

 at Limavady Junction, where the typical form was very 

 common, along with U. majhmillalus. A curious 

 monstrosity of U. obtusus also occurred, having a slender 

 tapered spire as long as the mouth. 



