Mr. Jeffreys on the Mollusca of Shetland. 165 



Ammonites sublcBvis, Am. lenticularis, and Am. mutabilis, 

 and some other indistinct species, are also found in the same 

 locality, generally compressed. 



DESCRIPTION OF THE PLATES. 



All the figures are of the natural size, with the exception of Fig. 1 . PI. VI ., 

 which is about one-half. 

 Plate III. Fig. 1, 2, 3. Am. ElizahethcB. 



1. Simplest form. 



2. Most usual character. 



3. An uncompressed specimen. 



4. Exhibits characters proving tlie specific identity of 



Figs. 1, 2, 3. 



Plate IV. Fig. I. Am. Comptoni. 



2. Am. Stutchburii. 



3. Part of the aperture of ditto. 



Plate V. Fig. 1. Am. SecIgwicJc'ii. 

 2. Am. Lonsdalii. 



Plate VI. Fig. 1. Am.Jluctuosus, half the natural size. 



2. Ditto j'oung. 



3. Am. Brightii. 



4. Ditto uncompressed. 



XX. — A List of Testaceous Mollusca collected i?i the Shet- 

 land Isles during a fev) days' residence there in the autumn 

 of this year, and not noticed by Dr. Fleming in his * History 

 of British Animals ' as indigenous to that country. By J. 

 GwYN Jeffreys, Esq., F.R. & L.S., &c. 



1. Helix alliacea (var.). At Lerwick, under stones near the sea- 



shore. 



2. Rissoa purpurea (n. s.). At Scalloway. 



3. Pyramidella (?) interstincta [Odostomia interstincta, Fleming']. 



In Lerwick Sound, among coral. 

 4. (?) insculpta [Odostomia insculpta, Fleming] . With 



the last. 

 5. {}) pallida [PhasianeUa palHda, Fleming]. With the 



last. 



6. Eulima Donovani [Phasianella polita, Fleming] . Lerwick Sound : 



not uncommon. 



7. Natica Helicdides. Dr. Johnson in Trans, of Berwickshire Nat. 



Hist. Society. One specimen (the second which appears to have 

 heen recorded) was found by me while dredging in Lerwick 

 Sound ; it presents some generic differences (particularly in 

 the aperture and umbilicus) from Natica. The figure in the 

 Transactions of the Berwickshire Natural History Society is 

 erroneously represented as reversed, and in other respects does 

 not give a good idea of the shell. 



usus albus (n. s.). In Lerwick Sound ; a single specimen, but 

 very distinct from any of its congeners. 



