PLATE LI. 



Helix Stagnalis : testa imperforata ovata-subulata, subangulata, 



apertura ovata. Linn. Si/st. Nat. p. 1249. 



i\^. 703. . 

 Cochlea testa prcxhicta acuminata, opaca, anfractibus senis subangu- 



latis, apertura ovata. Lmn. F. Suec. I. p. 374. 



No. 1310. //, No. 2188. 

 Buccinum longum sex spirarum, omnium & maximum & produc- 



tius, subflavum, pellucidum, in tenue acumen ex 



amplissima basi mucronatum. Turbo lie vis in 



stagnis degens. Aldror. de Tesiaceis, I. 3. 



p. 359. No. 3. 

 Buccinum subflavam pellucidum, sex orbium, clavicula admodum 



tenui, productiore. List. IL Conch, tab. 123. 

 Jig. 21. 

 Buccinum minus fuscum, sex spirarum, ore angustlore. List. LI, 



An. Angl.p. 139. tit. 22. tab. 2. jig. 22. 

 Helix Stagnalis. Lake. Penn. Br. Zool. No. 136. tab. ^Q.fg. 136. 

 Fresh water turbo with six wreaths. Wallis Northumb. p. 369. 

 Turbo longus et gracilis in tenue acumen mucronatus, imperforatus 



& pellucidus Stagnalis. Da Costa Br. Conch, 

 p. 93. sp. 52. tab. 5. Jig. II. 



o The largest and" most produced of the British river snails, and is 

 found in plenty in all our rivers, lakes, ponds, and other waters. 



Lifter and *PetI\er have made two species of this shell maximum 

 and minus j they appear however to be merely ditTerent stages of its 

 growth. 



