Canadian Butterflies. 115 



touching tlie preceding whorl just before it joins tlie outer lip, 

 leaving a very large, deep umbilicus. Length -^-^ inch, breadth -f^ 

 inch, divergence 68*^. 



Found in ditches and brooks, clinging to stones or submerged 

 plants, oftentimes iu great numbers. 



Animal a light drab color tinted pink, the head a little flesh- 

 colored above; tentacula silvery, "with a dark line running along 

 the ouiside from the eyes, -which are at the external base ; foot 

 not reaching beyond the first whorl, broadly rounded behind, di- 

 lated into angles at each side in front ; head half the width of the 

 foot, and projecting bsyond it, motions very slow. In delicate 

 aiid clean specimens, a dark mark parallel to the outer lip, and 

 another bisecting it, and belonging to the animal, appear through 

 the shell. 



Under this species I include all the small shells, hitherto regard- 

 ed as Paludi'n.e, which are collected in this region, ascribing the 

 very great differences they present in color and size to differences 

 of locahty and age. The shoulder of the whorl?, the conspicuous 

 umbilicus, and the rounded aperture, almost like Yabva'ta or 

 CYCLosTOiiA, are the most obvious characters. It is less solid, 

 less elongated, the aperture more circular, and the inner lip much 

 less closely appressed to the pi'eceding v/Iiorl than P. limosa Says 

 P. lustrica, Say, is described as much smaller, much more elongat- 

 ed, and more cylindi-ical. This I strongly suspect to be identical 

 with valvata pitpoidea in an immature state. It approaches 

 nearest to P. Cincinnatiemis, Anthony, Y\'hich is larger and more 

 conical and elongated. 



ARTICLE XXIII. — On tlie Order Lepidoptera,with the descrip- 

 tion of two sj^ecies of Canadian Butterflies. 



On reference to the classification of the Animal Kingdom, jiub- 

 lished in the first number of this magazine, Feb. 1856, p. 26-31 

 it will be seen that the second Department or Division Articulata 

 is divided into three classes : Insecfa, Crustacea, and Annelides 

 (or worms). The first of these three classes is further divided 

 into three sub-classes, viz. : Manducata (or Mandibulata,) insects 

 with jaws; /Swctorm (or Haustellata,) insects with a sucker ; and 

 A2}tera, or wingless insects. The second of these sub-classes con- 



