227 



bers under cedar logs in wet statioiis in the Hull beaver meadow. It; 

 has two teeth on the transverse lip, while the species above mentioned 

 have only one. Compare^l with this, V. hollesiana is very small, and 

 Y. gouldii very slender. Its measurements are, length, 2 mm.;, 

 diameter, 1-2 mm. In Binney and Bland's monograph its size is given 

 as much lai'ger — 3 mm. by 1-5, and in Gould's Invertebrates ns slightly 

 shorter and much less ventricose — "three-fortieths of an incli" by "one- 

 twenty-fifth of an inch," or, expre.ssed approximately in millimeters, 

 1-88 by 1. 



Vertigo milium, Gould. — This s})ecies is still more minute than 

 any yet referred to. It was first recorded from Canada in the report of 

 the conchological branch of this Club in 1882, from a single specimen 

 which I found in Billings' bush. I have since taken a few in the same 

 locality, but none elsewhere. It seems to prefer the edges of bits of 

 maple and elm bark. I have no doubt that; it is not uncommon, but 

 its extreme minuteness makes it hard to find. In fact it is by gather- 

 ing pieces of bark and holding them up to the sun so as to catch the 

 reflection of light on the ])olished sliell that I have been able to pro- 

 cure specimens. Still it is not, at least here, as small as stated by the 

 text writers. The length of the shells I have found is I'l mm., and 

 the diamel:er 07 mm. In the descri[)tion given in Binney and Bland 

 its length is given as 0-8 mm.; diameter, OG. In all other respects our 

 shell agrees with their descri[)tion and tlie much b3tter figures given in 

 Morse and Gould. 



Vertigo simplex, Gould. — Though larger, and therefore not so hard 

 to find as V. milium, this shell is almost as rare. I have taken solitary 

 speciniens in Billings' ba.sh, in Hull, and in a grove of young maples 

 near Beech wood, ))ut never met with a number at one time. It has. 

 more whorls than our other species, and tho aperture differs also in 

 being wholly unarmed with teeth. Here again my measurements differ 

 from those I find given elsewhere. Mature shells of V. simplex found 

 here attain, and sometimes .slightly exceed a length, of 2 mm., while 

 the diameter varies from 1 to 1"1 mm. According to the authors of 

 the Smithsonian monograph its length is 1"6 mm., breadth 0'8 mm. 



Snccinea ovalis, Gould. — This, the most beautiful of our amber 

 shells, is by far the commonest of the three species found here. It de- 



