18 



ramis cimex, Brown. — Alvania Freminvil- 



lia, Risso. — Rissoa cancellata, Desm. 



One broken specimen from deep water on the north 



coast. Is not Chiagi mistaken in asserting that the 



animal of this species has no operculum ? — Mem. 8, 



p. 214, tom. iii. 



XXX. Paludina, Lam. 

 1. ulvse. 



Turbo ulvge, Penn. — Cingula ulvas, Flem. — - 

 Rissoa ulvee, Brown, (2d edit.) — Pyramis 

 ulvae, Brown. — Paludina muriatica, Lam. 



Paludina balthica, Nilson Cyclostcnma 



acutum, Drap. 

 The animal is described by Nilson. 

 Muddy places on the shore, near Castletown. 



XXXT. Littorina, Fer. 



1. littorea. 



Littorina littorea, Fer. — Turbo littoreus, Lin.. 

 Flem. 

 The animal is described by Montagu. Common 

 on stones at low water. 



2. rudis. 



Littorina rudis, J/ewA-e. — Turbo rudis, Maton. 

 (3. Turbo jugosus, Maton. 

 With the last, common. 



3. tenebrosa. 



Turbo tenebrosus, Mont. 

 About Douglas, frequent. 



