332 Mighels' Catalogue of 



B. oryza, Tott. Only one specimen has been found in 

 the waters of the State, to my knowledge. 



B. puncto-striata, Migh. I have found only a single indi- 

 vidual of this fine species. 



B. pertenuis, Migh. This minute species is found occa- 

 sionally, but is rare. 



B, occulta, (fossil.) Migh. This occurs in the post-ter- 

 tiary formation at Westbrook, in company with Nucula port- 

 landica, Hk. Rare. 



Genus Helix. Lin, 



H, albolahris, Say. This species occurs, solitary, in all 

 parts of the State, and on some of the islands in Casco Bay, 

 but I am not aware that it is anywhere in plenty. It is of 

 rather smaller size than specimens from the Southern and 

 Western States. 



H. thyroidus, Say. I insert this species on the authority of 

 Dr. C. T. Jackson, {^^ Report on the Geology of Maine.^') I 

 have not found it. 



H. hortensis, Muller. Captain Walden has recently detected 

 this species on a little island in Casco Bay. It must be very 

 plenty, as he obtained more than five hundred specimens in a 

 few hours, and says he could have obtained many more. He 

 informs me that he found them buried deep in the loose soil, 

 under fragments of wood, and at the roots of plants. Half a 

 dozen or more were often found occupying the same burrow. 

 This does not accord with the observations of Dr. Binney. 

 He says, ^' it does not appear to burrow under stones or de- 

 caying wood and leaves, but is found on the surface of the 

 ground." My specimens are much more beautifully banded 

 than those of Massachusetts. Most of them have five dark 

 brown bands on a yellow ground ; some four, some two, and a 

 few none. Some have light fawn-colored bands on a white 

 ground ; in others, in place of colored bands, the yellow 

 ground is interrupted with nearly transparent zones. One 

 beautiful specimen is heterostrophed. 



Tlie island is nearly covered by the sea at high water ; only 

 a few square rods are above high-water mark. 



