46 BULLETIN OF THE 



jaw is high, arched, with blunt ends : six ribs on the anterior surface, denticu- 

 lating either margin. The lingual membrane (PI. III. Fig. 1) is long and 

 narrow : teeth 38-1-38, with about nine laterals on either side, the tenth tooth 

 having the inner cutting point bifid : centrals and first laterals without side 

 cusps and cutting points : marginals low, wide, with two distinct cusps, each 

 furnished with bifid cutting points. 



Pomatia aspersa, Mull. 

 See p. 24. 



Glyptostoma Newberryanum, W. G. B. 



Perussacia subcylindrica, Lin. 

 Received also from Washington Territory. 



Pupa Rowelli, Newc. Pupa Californica, Newc. 



Pupa muscorum, Lin. 

 A variety Lundstromi, Westerlund, has been described from Alaska. 



Succinea Sillimani, Bl. Succinea rusticana, Gld. 



Stretchiana, Bl. Nuttalliana, Lea. 



Hawkinsi, Baikd. 



Succinea chrysis, Westerlund. 



Alaska. This is the well-known yellowish variety of S. lineata, often found 

 at far northern points. An authentic specimen is figured on p. 473 of Man. 

 Amer. Land Shells. 



Succinea Oregonensis, Lea. 



Succinea avara, Sat. 

 Received also from California. 



Veronicella olivacea, Stearns. 

 Onchidella borealis, Ball. 

 Onchidella Carpenter!, W. G. B. 



