Notes on a Post- Tertiary Fresh- Water Deposit. 339 



MOLLUSCA. 



Pisidium pusillum (Gmelin). Frequent. 

 Valvata crustata (Miiller). Rare. 

 Planorhis nautileus (Linne). Rare. 



,, contortus (Linne). Frequent. 



Limncea peregra (Miiller). Rare. 

 ,, ^m^ws^ris (Miiller). Rare. 

 ,, truncatula (Miiller). Frequent. 

 Sicccinea putris (Linne). Frequent. 

 Zonites nitidulus (Drap.). Not very comnion. ; 



„ fulvus (Miiller). Frequent. 

 Helix rotundata (Miiller). Rare. 



„ 7;?^?cAe//a (Miiller). Rare. 



„ .? Rare. 

 Papa marginata (Drap.). Rare. 

 Vertigo antivertigo (Drap.). Common. 



,, pygmoia (Drap.). Frequent. 



,, suhstriata, Jeffreys. Rare. 

 Carychimn minimum, Miiller. Common. 



OSTRACODA. 



Cyjyria ophthalmica (Jurine). Rare. 



,, Serena (Koch). Rare. 

 Scottia hrowniana (Jones). Frequent. 

 Erpetocypris strigata (O. F. Miiller). Rare. 

 Ilyocypris gibha (Ramclolir). Frequent. 

 Cando7ia Candida. O. F. Miiller. Not common. 

 „ kiiigsleii, Brady and Robertson. Rare. 



Seeds representing the following orders of flowering plants 

 were also observed, viz., Caryopliyllacem, Chenopodiacccv, Poly- 

 gonacea^, Naiadacem, and Cyperacem ; pieces of the stems of 

 JSqnisetum (Horsetail), spores of Chara, and macrospores of 

 Isoetes also occurred, but did not appear to be common. 

 The Coleoptera remains observed represent at least two 

 species, one of which is probably an Elaphrus — a beetle that 

 frequents marshy ground. 



The above list shows that the number of species of 

 Mollusca from this deposit is 18 (7 aquatic, 2 marsh, and 9 

 terrestrial), whereas only 10 species have as yet been observed 



