389 Mr. Jerrreys on the Testaceous Pneumonobranchous 
* Anfractibus plurimis, connexis. 
1. VORTEX. 
Animal violaceo-fuscum. Tentacula albida. 
Testa supra subconcava, glabra, tenuis, pellucida, fusces- 
centi-cornea, subtüs plana, carina marginali. A»frac- 
tus 6—8, sensim decrescentes. Apertura compresso- 
rhomboidea. 
Long. 0.065.— Diam. 0.4. 
Planorbis Vortex. Müll. Verm. 2. p. 158. Drap. Hist. 
des Moll. p. 44. t. 2. f. 4, 5. 
Helix Vortex. Linn. Syst. Nat. 1. p. 1243. 
a. anfractu ultimo in carinam superne obliquato. 
B8. minor, carina obsoleta. 
Planorbis Vortex, 8. Drap. Hist. des Moll. p. 45. t. 2. 
ES T eld 
spirorbis. Mill. Per: 9. p. 161. 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, kc. The presence of a keel, and 
the consequent flatness of the under side, are not constant 
onara ters. Sete Oe 
2. CoxToRTUS. 
Animal fuscum. — Tentacula brevia, pallida: 
Testa suprà subconcava, subtüs concava, perforata, glabra, 
tenuis, pellucida, fulvescenti-cornea. Anfractus 8, ex- 
_ tus rotundati, suturá excavatá. Apertura valdé com- 
ong. 0015. Diam. 0.25. E | 
= Se " Planorbis 
