Shells of New England. 45 



LIMNiEA DECOLLATA. 



Plate IV. Fig. 13. 13, a, b, c. 



L. testa ventricosa ; anfraclibus duobus vel tribus, ultimo magno; spira brevi- 

 uscula, plerumque decollata ; sutura impressa; apertura maximi, eub-campa- 

 nulati ; labro porrecto ; columella valide plicata. 



Shell very ventricose, rather thick, sub-ovate, or sub-rotund, 

 in outUne an irregular rhomboid ; epidermis of an ohvaceous 

 green color, rather thin, deciduous ; whorls two to three ; 

 spire very short, generally decollated ; whole surface gener- 

 ally rather rough ; striae of growth coarse and fine alter- 

 nately ; transverse striae on the body whorl sparse, interrupted, 

 sometimes obsolete ; body whorl composes almost the whole 

 shell ; aperture very large, sub-campanulate ; its length is 

 very little greater than the breadth, and occupies more than 

 two-thirds the length of the shell ; labrum rather thin, sim- 

 ple ; fold of the columella very prominent. 



Length, ,6 inch ; breadth, ,5 inch ; height, ,4 inch. 



Animal dingy mouse-color, with a slight tinge of pm'ple, 

 covered with numerous, microscopic, elongated, white spots, 

 on every visible part of the surface, including the mouth and 

 tentacula ; foot of a chocolate-color, rather broad, length rather 

 greater than the aperture ; habits sluggish. 



Cabinets of Bost. Soc. Nat. Hist., Dr. Gould, S. S. Halde- 

 man, J. G. Anthony, J. W. Mighels, and C. B. Adams. 



Habitat. Unity, Me., discovered by Dr. Milliken of that 

 town, to whom we are indebted for specimens. 



Remarks. This odd, but interesting shell, is easily recog- 

 nized by its rhomboidal aspect, wide aperture, decollated spire 

 and rather rough and distorted appearance. It is allied to 

 L. catascopiuni, Say, but is distinct from that shell by having 

 less whorls by two, and a much shorter spire ; by being wider, 

 and its divergence greater by more than thirty degrees. By 

 some it has been supposed to be identical with L. emarginata, 

 Say. This is impossible. L. emarginata is much more cy- 

 lindrical, the divergence of its spire is scarcely half as great 

 as that of our shell, it is much thinner, and has at least two 

 more volutions. Our shell is also destitute of the '' deep 

 emargination" which distinguishes L. emarginata. 



