200 THE CHICAGO ACADEMY OF SCIENCES. 



respiratory orifice situated on the right side of the body, near 

 the posterior margin of the mantle; exudes mucus as in L. 

 maximus. 



Length, 25.00; width, 3.00; height, 2.50 mill. (9303) extended. 



Jaw : Arched; ends pointed; median projection sharp and 

 anterior border generally serrated; anterior surface striate (Fig. 

 45, J). 



Radula formula : V + ++i+ ++- ( 36 - I - 36) ; 

 central tooth longer than wide, the lower corners of the base 

 of attachment attenuated, tricuspid, the central cusp long and 

 spear-shaped, the side cusps small, all provided with strong 

 cutting points ; lateral teeth (thirteen perfect) similar to the cen- 

 tral tooth, but bicuspid, or with only a faint indication of the 

 inner cusp, the central or inner cusp the largest, and all with cut- 

 ting points; marginals aculeate, the first twelve bifid and the 

 balance thorn shaped (Fig. 45). 



Distribution: Northern and Central parts of the United 

 States, Canada, Alaska and Siberia; Santa Fe, New Mexico.* ' 



Habitat: Under stones and rotting logs or old boards, 

 either in the woods or in pastures. It is found in the green- 

 houses about the tanks of water. 



Remarks: This is our most common and only native 

 Limax. It appears to be distributed over the entire area under 

 consideration. It is noted particularly for its habit of suspend- 

 ing itself by a thread of mucus from some object. In the 

 woods at Bowmanville this species is very common, but two 

 specimens are seldom found together, although every chip and 

 piece of wood in the vicinity may support an individual. 



FAMILY PHILOMYCID^:. 



Animal limaciform. Mantle covering whole body ; jaw with 

 or without ribs, and median projection to cutting edge; lingual 

 membrane of Helicidae; no shell. (W. G. Binney.)y 



GENUS PHILOMYCUS Ferussac, 1821. 



Philomycus FERUSSAC, Tab. Syst.. p. 15, 1821. 



Tebennophorus BINNEY, Bost. Journ. Nat. Hist., Vol. IV, p. 171, 1842. 



"Animal limaciform. Body somewhat flattened, terminat- 



*Vide Cockerell, The Nautilus, Vol. VIII, p. 57. 



4-Man Ainnr T o n A QV. />11 e. .-, r-> 



- v me v^ucnereu, i ne iNauums, v 

 fMan. Amer. Land Shells, p. 53. 



