332 Mr. Jeffreys on the Testaceous Pneumonohranchous 



8. MORTONI. 



Animal pallidum. Tentacula nigra, respectu corpusculi 



longa. (MiilL) 

 Testa supr^ depressior, nitidissima, glabra ; subtCis planata, 



substriata ; lateribus utrinque acutis ; pallid^ fulva. 



Anfractus 5. Apertura compressa, subrhomboidea. 



Long. 0.085.— Diam. 0.11. 

 Helix Trochulus. MiilL Verm. 2. j?. 79? 



From the rejectamenta of the Avon river, near Bristol. 



I have scarcely any doubt of this species being the Trochus 

 terresiris /3. of Da Costa, which is stated by that author to 

 have been found by Mr. Morton in the clefts of a sallow 

 near a pond in Thorpe Mandeville, Northamptonshire, and 

 which, as well as the Trochus terresiris of Pennant, has been 

 referred by Montagu and succeeding authors to the Helix ele- 

 ga7is, a species inhabiting the plains of the South of France. 



9. ACULEATA. 



Animal grisescens, testd erects incedit. Tentacula per- 



longa, cylindrica. 

 Testa globosa, lamellis mucronatis trans versis aspera, fusca. 



Anfractus vix 4. Apertura elliptico-rotundata. 



Long. 0.085.— Diam. 0.1 fer^. 



Helix aculeata. MiilL Verm. 2. p. 81. 



spinulosa. Lightf. in Phil. Trans. 76. p. 166. 



Mont. Test. Brit. p. 429- t 11. /. 10. Maton ^ 

 Rackett in Linn. Trans. 8. p. 201. 



Not uncommon in a coppice at Newton near Swansea. 

 The animal feeds on the Jungermannia platyphylla. 



10. Lamellata. 



