382 Mr. Jepfreys on the Testaceous Pneumonohranchous 



* Anfractibus plurimis, connexis. 



1. Vortex. 



Animal violaceo-fuscum. Tentacula albida. 



Testa supra subconcava, glabra, tenuis, pellucida, fusces- 

 centi-cornea, subtils plana, carinA, marginal!. Anfrac- 

 tus 6 — 8, sensim decrescentes. Apertura compresso- 

 rhomboidea. 



Long. 0.065.— Diam. 0.4. 



Planorbis Vortex. MilU. Verm. 2. p. 158. Drop. Hist. 

 des Moll. p. 44. t. 2./. 4, 5. 



Helix Vortex. Linn. Syst. Nat. 1. p. 1243. 

 a. anfractu ultimo in carinam supernfe obliquato. 

 /3. minor, carina obsolete. 



Planorbis Vortex, /3. Drop. Hist, des Moll. p. 45. t. 2. 



f.6,7. 

 spirorbis. Miill. Verm. 2. p. l6l. Lam. Hist. 



des Anim. sans Vert. 6. p. 153. 

 Helix spirorbis. Gmel. Syst. Nat. 1. p. 3624. Mont. 



Test. Brit. p. 455. t. 25. f. 2. 



Common in ditches, &c. The presence of a keel, and 

 the consequent flatness of the under side, are not constant 

 characters. 



2. CONTORTUS. 



Animal fuscum. Tentacula brevia, pallida. 



Testa suprk subconcava, subtils concava, perforata, glabra, 

 tenuis, pellucida, fulvescenti-cornea. Anfractus 8, ex- 

 tils rotundati, sutur^ excavate. Apertura valdfe com- 

 pressa. 



Long. 0.075. — Diam. 0.25. 



Planorbis 



