224 



If either L. camj.estris or L. agrentis is s ispenJed in the aqaariiim 

 on a sheet of glass or other convenient support, it will descend by 

 means of a thread of mucus to the bottom, and making its way across 

 it and up the sides, rests only wlien its breathing pore has been bronglit 

 tibove the surface of the water. In its progress the tentacles are almost 

 wholly withdrawn within the head, and vision, which must be dim at 

 ■best, becomes impossible. 



Ttihennojihorus carollnensls, Bosc. — This large slug is not uncom- 

 mon in this vicinity inside the loosening bark of decaying tiees and in 

 rotting logs. On the Olnb's excursion last July to the Chats, it was 

 observed in abundance in the woods near Molu's wharf under the bark 

 of old beech and elm stumps. It is very variable in color, some 

 specimens being of a uniform yellowish tinge, others with dusky spots 

 sprinkled over the mantle usually in groups of two or three longitudinal 

 rows. M}' largest alcoholic specimen is 3+ mm. in length, 18 in height 

 and 12 in diameter. When extended it would be from 80 to 100 mm. 

 long. 



Fernssacla sHbci/ltitdrica, L. {Buli/nus lubriciis, Gould.) — Mr. 

 Heron states that this shell is found in great numbers six miles from 

 Ottawa along the line of the St. L. & O. Ry. Near the city it is not, 

 to my knowledge, so abundant, though still far from rare. I have found 

 it most plentiful in a rocky field in New Edinburgh, lying beyond and 

 to the left of the main entrance to Rideau Hall, and solitary specimens 

 will lie met with in the woods everywhere. The only two shells found 

 in H(dl on November 16th differ very much from tliose usually occur 

 ring. Measurements of what may be called the typical form give an 

 average length of G mm., diameter 2-5. The Hull shells measure 6-8 

 by 2.3 mm. Although the diameter is only 0.2 mm. less, yet as the 

 shells are longer than the type, they ap|)ear much more slender. It 

 remains to be determined whether these two shells represent mertly 

 accidental variations or a fixed variety peculiar to the Laurentides. 

 They were hibernating when found and had formed their winter 

 epiphragm which is altogether different from the thin transparent 

 membrane used during aestivation. It is thick, strong and calcareous, 

 like that formed for winter iise by lldix ponuitia of Europe. None 

 other of our indigenous shells, nor even those which are comuion to 



