TESTACELLUS* 



earth-worm of mucb greater size and apparent force than 

 itself, but whichj by its utmost exertion is unable to escape. 

 jDe Ferussac and Cuvier consider this as the only carnivo- 

 rous terrestrial moilusea, Th^ animal bears a general 

 resemblance to a slug ; it carries its small shell on its poste- 

 rior extremity. The shell is compressed, spoonshaped, 

 with a very short spiral apex, its aperture ife very large,' 

 oblong, slightly notched at the upper or posterior pai't ; the 

 outer lip is entire, the inri^rlip (called, by De Ferussac, the 

 clavicle J is generally thickened and revolute. There is a 

 transverse, oblong, lunulate muscular impression in the 

 lower part of the aperture, which we suppose serves as a 

 point of attacliment between the shell and the animal. The 

 outside of the shell is covered with a thin, horny, commonly 

 olive green, epidermis, and is marked by the lines of growth. 



Only tzm species of this singular Genus have been hi- 

 therto described, (for ^>'e cannot consideii De Ferussac's T. 

 ambiguus as one, inasmuch as it has every appearance of 

 being an internal shell) one of which, halioiideus of De 

 Ferussac^ is not uncommon i,n, prance ; and the other, the. 

 Maugei of the same author, i^s a native of Teneritle, but 

 naturalized in a garden at Bristol : a third was lately dis-, 

 covered^ by Ptir. Sowerby^ in a garden at Lambeth, it may 

 therefore be considered as a native of this Island. We have 

 named it T. Hcutulum^ and shall endeavour below to point 

 out the characters of all three. 



1. T. haliotideus, lesla ovata^ postice acuminata ; claLicula, 



lata el 'plana. — D<i Feryissac^ vol. i. p. 9L t. yiii. 

 f. 5 to 9. 



2. T. Maugei, tesiu ovaiorclongata.^ spira elevaiiuscula ; 



clavicula angusta, rotundata.—De Ferussac^ vol. i. 

 p. 94. t. viil 1^ la. li. 



3. T.Scutulum, testa ovata antlce paulara acuminata.^ exliis 



plana^ clavicula arcualqt.^ elevala. — Tah. nost. f. 3 to G, 

 Ohs. — The animal of this species, bears a near reseni^ 

 blance to that of T. haliotideus;, not having tlie double row 

 of tubercles running from the bead to the anterior part of 

 the shell, so conspicuous in that of T. Maugei. 



I-ia:. 1. Outside of the shell of T. ha 



liotideiis. 

 Fig. 2. Inside of the same. 

 Fi^. 3. Front view of the animal of T. 



Scululum. 



Fig-, 4. View of the same animal when 



extended. 

 Fi^. .5. Outside of the shell of T. Scu- 



tulum, magnified. 



Fi::^. 0. Inside, of the same, alsa uiag.- 

 nified. 



Fi^. 7. The animal of T. Mausrd con- 



traeted. 

 Fig-. S. The same extended, 

 Fi^-. 9. O utside of the shell of T. iiXaw- 



Fii^-. 10. Inside of the same. 



