232 PNEUMONOBRANCHIATA. 



counts (he proceeds) for the mutilated and often im- 

 perfectly repaired state of the upper volutions of 

 some specimens." (Linn. Trans, xvi. 371. But see 

 Turton*, Man.ed. 1. 78.; Gray, Phil. Trans. 1833.) 

 In the spring, these animals are often infested with 

 a small slender species of Gordius, which affix them- 

 selves to the edge of the mantle over the back of the 

 neck ; they are so common that Draparnaud mistook 

 them for the respiratory organs of the animal. Mon- 

 tagu has also observed them on L. truncatulus. 



* RADIX Montfort. (Gulnaria Leach.) 



Shell subovate, last whorl ventricose ; mouth more than 

 half the length of the shell. 



88. 1. LIMN^EUS auricularius. Wide-mouthed Mud 

 Shell, (t. 7. f. 100.) Shell extremely inflated, 

 striolate, with a very short acute spire ; aperture 

 oblique, vastly expanded and roundish-oval. 



Limneus auricularius. Drap. p. 49. t. 2. f. 28, 

 29. 32. ; Jeffreys, Linn. Trans, xvi. 372. ; Rossm. 

 Icon. i. 98. t. 2. f. 55. 



Lymnaea auricularia. Lamarck, vi. ii. p. 161. 



Lymneus auricularius. Brard, p. 140. t. 5. f. 2, 

 3.; Turton, Man. ed. 1. 117. f. 100. 



Radix auriculatus. De Montfort, ii. p. 207. 



Gulnaria auricularia. Leach, Mollusc, p. 148. 



Helix auricularia. Linn. S. N. i. 1250. ; Penn. B. 

 Z. iv. 86. f. 138. ; Mont. p. 375. t. 16. f. 2. 



Helix limosa. Montag. T. B. 381. t. 16. f. ]. ? 



* Dr. Turton, by mistake, appears to think that the shells have 

 " a vascular connection" with the animal. This is not the case ; 

 but still the description he gives of how the apex falls off is true; 

 and Miiller is correct in saying the apex of the shell was once 

 perfect. 



