140 TESTACELLIDiE. 



Nilsson describes his species of the same name as being 

 equal in size to L, flavus ; while the authors of the 

 ^British Mollusca' state that the dimensions of their 

 slug do not exceed an inch and a quarter in length. 

 Miiller, Draparnaud, and Nilsson also mention its 

 having a greenish hue, which the British slug does 

 not appear to have possessed, M. Drouet says this 

 species belongs to Avion. A single specimen was found 

 by Mr. Blacklock in a wood at Allansford, near Shortly 

 Bridge, in Northumberland, and by him communicated 

 to Mr. Alder, who published the discovery in the ' Trans- 

 actions of the Northumberland and Newcastle-upon- 

 Tyne Natural History Society.^ It may possibly have 

 been the young or a variety of L. flavus. As, however, 

 this tribe is gregarious or at any rate individually 

 numerous, it is to be hoped that further researches will 

 be made, so as to settle the question as regards not only 

 the specific distinction of this slug, but also the pro- 

 priety of its admission into the British fauna. 



Family II. TESTACELLID.^. 



Body cyhndrical, exceedingly long and flexible : mantle ru- 

 dimentary, but capable of being occasionally expanded, gene- 

 rally covered by the shell : other characters similar to those of 

 Limacidoe, except in a few anatomical particulars. 



Shell ear-shaped, with a very small terminal spire, ex- 

 ternal, and occupying the same place as the mantle in the last 

 family. 



This family comprises only one genus, viz., — 



TESTACEL'LA*, Cuvier. PL V. f. 6-9. 



Body of a firm texture, with a nearly smooth skin : tentacles 

 cylindrical: labial j^alps extensible: foot margined. 



* Diminutive shell. 



