249 



94. solidula, Pfr. 



95. spurca, Gould. 



96. striata, Krauss. 



97. subgrancsa, Pfr. 



98. subrugata, id. 



99. Tahitensis, id. 



100. Tamsiana, Pfr. 



101. Taylori, irf. 



102. Texasiana, id. 



103. tigrina, Less. 



104. Totteniana, Ze#. 



105. undulata, Say. 



106. unguis, j?er. 



107. venusta, Gotdd. 



108. vesicalis, id. 



109. virescens, illbr. 



110. Wardiana, Lea. 



Figure. 



Succinea patula. PL 20. Fig. 112. Shell, showing its inflated, fragile 

 substance and broad aperture. 



Genus 12. VITRINA, Draparnaud. 



Animal; bulky, large for the shell ; lanceolate ; head toith four 

 tentacles, the lower pair short ; mantle ample, thick, reflected 

 upon the shell ; furnished with a lobe on the right side under 

 the spire ; tail obliquely truncated; edge-teeth of tongue acu- 

 leate. (Forbes.) 



Shell ; rotundaiely ovate, sometimes depressed, imperforate, thin, 

 vesicular, glassy or horny green ; spire short ; last whorl large 

 and inflated ; lip and columella simple. 



The extensive family of the Colimacea is brought to a close with a genus 

 of which the shell is of a slight, vesicular, horny or greenish-glassy sub- 

 stance, coiled into no more than three whorls, and offering a transition to 

 the family of the Limacinea, in which the shell ceases to be convoluted. 

 The appearance of Vitrina when in motion is that of a Limax, with a 

 Helix shell upon its back. The mantle is prolonged into a lobe, such as 

 in Limax is developed for the protection of the gills, but here the shell 

 intervenes for their protection. As many as eighty species are known. 

 Twelve, including three abnormal forms described by Hartmann as a 

 separate genus, Daudebardia, inhabit Europe, but only one, V. pellucida, 

 has been found in Britain, common in all parts of the country, chiefly 

 among moss and under stones. The remainder, with two exceptions, are 

 about evenly distributed over the islands and continents of the Old World, 

 as far south as New Holland, from whence several very interesting species 

 have been received. The only species known to the western hemisphere is 

 one inhabiting the vicinity of Portland and eastern part of Maine, in the 

 United States, V. Americana,* and one inhabiting Greenland, V. Angelica. 



Dr. Binuey remarks on this species, that " when kept in confinement the animal has been 



2 K 



