shell. The foot is oval, dilated into wings in front; the muzzle is long, 

 narrow and bifurcated. The animal is brown or blackish and is very 

 active. 



LACUNA VINCTA Montagu 

 PI. III. Fig. 14. Length 12 mm. 



To get an idea of the great number of names that this creature is 

 burdened with one must consult Forbes and Hanley who include 

 these names in their great work. Especially must the student refer to 

 Jeffreys, (Vol. Ill) who records L. vincta as a synonym of L. divari- 

 cata of Fabricius. Sars also recognizes it under the name divaricata 

 and gives an excellent figure of it which certainly closely resembles 

 our form. Our species has a brown variety, known as L. fusca. The 

 animal of L. vincta is nearly black above, the foot light gray, the 

 head very broad, the tentacles long, the eyes far apart on their outer 

 bases. The black of the head terminates abruptly at the base of the 

 tentacles just below the eyes, the tentacles are very light colored. 

 The creature is very active; the shell is held vertically and ossilates 

 continually when the creature is crawling. The young shell has a 

 very short spire. (PI. VIII. Fig. 14 A). 



LACUNA NERITOIDEA Gould 

 PL III. Fig. 15. Length 5mm. 



This species is regarded as a variety of the English species L. 

 pallidula by Jeffreys and Sars. The animal is yellowish, the eyes 

 prominent on thickened bases from which spring the rather long 

 tentacles, the muzzle is short and truncate with angular process above. 

 The opercular appendages are very short. In Portland, Maine, the 

 species was ovulating in March and individuals were very abundant. 

 The drawing here given was made sixty-five years ago. I am amazed 

 that a new generic name has not been given to the species. The shell 

 closely resembles a short spiral Liiorina, the animal, however, with 

 its opercular tentacles, and the shell with its lacunal columella is 

 unmistakable. 



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