56 the nautilus. 



Gastropoda. 

 A. piilmonata. 



Selenites Vancouverensis Lea. 



Limax campestris L. var. occideutalis Cooper. 



Limax campestris L. var. zonatipes Ckll. (MS) new variety. 



Limax Hewstoni Cooper. 



Zoiiites cellarius Miill. (introduced). 



Ariolimax Californicus Cooper. 



Punctum conspectum Bland. 



Plelix Californiensis Lea. 



Var. Nickliuiana Lea, (also albino form). 

 Helix arrosa Gld. (Common in Marin county). 

 Helix armigerus Ancey. 

 Helix loricata Gld. 

 Pupa Californica Rowell. 

 Succinea Oregonensis Lea. 

 Alexia myosotis Drap. (introduced). 

 Limnsea palustris ^liill. 

 Limnsea palustris var. proxima Lea. 

 Limnsea palustris var. Nuttalliana L. 

 Limnsea palustris var. Rowellii Tryon. 

 Limnsea palustris var. umbrosa Say. 

 Limnfea palustris var. Traskii Tryon. 

 Limmea Adelinae Tryon. 

 Limnsea humilis Say. 

 Limnrea humilis var. ferruginea Hald. 

 Limntea obrussa Say (desidiosa Say). 

 Limnaja bombycina Lunge (introduced). 

 Physa Gabbi Tryon. 

 Physa Gabbi var. D'Orbignyana Lea. 

 Pliysa Gabbi var. Traskii Lea. 

 Physa diaphana Tryon. 

 Physa virginea Gld. 

 Planorbis tumens Cpr. 

 Planorbis amnion Gld. 

 Planorbis opercularis Gld. 

 Planorbis vermicularis Gld. 

 Ancylus fragilis Tryon. 



