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 ZL. 
maximus. 
Length, 25.00; width, 3.00; height, 2.50 mill. (9303) extended. 
Faw: Arched; ends pointed; median projection sharp and — 
anterior border generally serrated; anterior surface striate (Fig. 
45, J). 
Radula formula: 1)+12+4+48+4+418+124+41 (36—1—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 PHILOMYCIDz. 
Animal limaciform. Mantle covering whole body; jaw with 
or without ribs, and median projection to cutting edge; lingual 
membrane of Helicidz; no shell. (W.G. Binney.)tT 
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. 
+ Man. Amer. Land Shells, p. 53. 
