242 PNEUMONOBRANCHIATA. 



I have not been able to determine the Turbo aari- 

 cularis Montagu T. B. 308., said to resemble H. fos- 

 saria, but with a rather ear-shaped mouth, found on 

 the shore near Southampton. Can it be a Lacuna ? 



93. 6. Limn^us glaber. Eight- whorled Mud ShelL 

 (t. 9. f. 106.) Shell elongated, oblong-cylindrical, 

 tapering, brittle, pellucid, yellowish white, with 

 seven or eight convex volutions, and the aper- 

 ture elongate-ovate. 



Limneus elongatus. Drap. p. 52. t. 3. f. 3, 4. (bad) ; 

 Alder, 1. c. 115.; Turton, Man. ecL 1. 122. 

 f. 106. 



Limnea elongata. Sowerby, Gen. f. 6. 



Limnaeus elongatus. Rossm. Icon. i. 101. t. 2. 

 f. 58. 



Stagnicola octanfracta. Leach, Mollusc, p. 141. 



Helix octanfracta. Mont. p. 396. 588. t. 11. f. 8. 



■ peregrina. Dillwyn, p. 954. 



octona. Penn. B. Z. ii. t. 86. f. 135. 



Buccinum glabrum. Miiller, Verm. ii. 135. 



Monstrosity, the outer lip, with a thick white in- 

 ternal rib. 



Lymnaea leucostoma. Lamarck, vi. ii. p. 162. 



Bulimus leucostoma. Poiret, Prod. 37. 



Var. 1. Spire elongate, twisted. 



Var. 2. Apex of spire truncated or decollated. 



In stagnant waters. 



Animal blackish or dusky. 



Shell an inch long, regularly tapering, with the 

 ultimate volution not larger in proportion than the 

 rest ; spire composed of seven or eight tumid volu- 

 tions, on the larger of which are often a few trans- 



