LIMAX. 31 



ted a little in front of the middle. The tentacles are 

 small and short. Length, three and one-half inches. 



REMARKS. That this animal belongs to the genus 

 Arion there can be little doubt, from the peculiar struct- 

 ure of the tail, as represented in Mr. Drayton's figure, 

 and from the anterior position of the respiratory orifice. 

 It is a well-marked species, characterized especially by 

 the little leaf-like areolge by which the surface is marked. 

 It was found by Dr. Charles Pickering near Discovery 

 Harbor, Puget Sound. 



GENUS LIMAX, FERUSSAC. 



GENERIC CHARACTERS. Body lessening towards the 

 posterior extremity, which terminates in a point. Back 

 with a carina or keel when contracted, convex when 

 extended. Integuments with longitudinal elongated 

 glands, and anastomosing furrows arranged in the same 

 manner upon both sides. Mantle anterior, oval, marked 

 with fine concentric striae, unattached and free at the 

 front and sides, but connected with the body at its poste- 

 rior part, and containing in this part a testaceous rudi- 

 ment or shell. Locomotive disk not expanded at margin, 

 having a narrow band running longitudinally along 

 its centre and separated from the sides by a well- 

 defined line or furrow. Respiratory orifice near the 

 posterior margin of the mantle, large. Anal orifice im- 



