Perkins.] 128 [October 



MEASUREMENTS. 



Length of shell 13 mill. Breadth 10 mill. Height 5 mill. 



" foot 9 " 6 " 



" tentacles 5 " 



" branchial plume 6.2 " 



HELICID^}. 

 Mesodon Rafinesque, 1831. 



Mesodon albolabris Morse, Journ. Port. Soc. Nat. Hist., Vol. 

 I, p. 8. Helix albolabris Say, Am. Conch., pp. 5, 21, 23, pi. xiii, 

 1816; Gould, Invert. Mass., p. 170, fig. 101 ; Morse, Am. Nat., Vol. 

 I, pp. 16, 96, pi. i, fig. 2. 



Common. 



Stenotrema Eafinesque, 1819. 



Stenotrema monodon Morse, Journ. Port. Soc. Nat. Hist., 

 Vol. I, p. 10. Helix monodon Rackett, Linn, Trans. ; Gould, Invert. 

 Mass., p. 174, fig. 113: Morse, Am. Nat., Vol. i, p. 151, figs. 12, 13. 



Not common. Professor Verrill Las collected a few specimens. 



Stenotrema hirsuta Tryon, Am. Journ. Conch., Vol. in. Helix 

 hirsuta Say, Am. Conch., pp. 7, 8, 21, 1817; Gould, Invert. Mass., 

 p. 175, fig. 116; Morse, Am. Nat., Vol. I, p. 151, figs. 14, 15. 



Common. 



Anguispira Morse, 1864. 



Anguispira alternata Morse, Journ. Port. Soc. Nat. Hist., 

 Vol. I, p. 11. Helix alternata Say, Am. Conch., pp. 6, 21, 31, 1816; 

 Gould, Invert. Mass., p. 177, fig. 114; Morse, Am. Nat., Vol. i, p. 

 187, figs. 17, 18. 



Quite rare. 



Hyalina Agassiz, 1837. 



Hyalina arborea Morse, Journ. Port. Soc. Nat. Hist., Vol. i, p. 

 14. Helix arborea Say, Am. Conch., p. 31, 1824; Gould, Invert. 

 Mass., p. 182, fig. 110 ; Morse, Am. Nat., Vol. I, p. 542, fig. 30. 



Common in damp woods. 



Hyalina eleetrina Morse, Journ. Port. Soc. Nat. Hist., Vol. i, 

 p. 13. Helix eleetrina Gould, Invert. Mass., p. 183, fig. Ill; Morse, 

 Am. Nat., Vol. I, p. 542, fig. 31. 



Collected by Prof. Verrill. Quite rare. 



