MODERN SYSTEM. 
110 
Cancer Gammarus. Montagu, Trans. Linn. Soc. ix. t. 4.J. 6. Apseudcs 
Talpa. Leach, Edin. Encycl. vii, 404. — li ons. Linn. Soc. xi. 37 3.— " 
Supp.to Encycl. Brit. 428. vol. i. 
Inhabits the British ocean : length four lines: colour yellowish-white: 
is very rare. 
D. Tail furnished with styles. 
Fara. VIII. AsELLiDji. 
Interior antenna distinct. 
Snaps 1. Styles of the tail exserted: anterior legs monodactyle. 
Genus 30. JAN I It A. Leach. 
Clares bifid : eyes moderate, lateral-subvertical : internal antenna shorter 
than the peduncle of the external ones. 
Sp. 1. Jan. maculosa. Body cinereous, maculated with fuscous. ^ 
Oniscus maculosus. Montagu’s MSS. Janira maculosa. Leach, Edm. F.n' 
cycl. vii. 434. — Trans. Linn. Soc. xi. 373. — Sapp, to Encycl. Brit. i. 4* ■ 
Inhabits the southern coast of Devonshire, amongst marine plants. 
Genus 31. ASELLUS. Geoff., Olivier, Lulr., Bose, Leach. Ex TO' 
mon. Klein. 
Clams simple : eyes minute, lateral : interior antenna of the length oi tb 
setiferous joint of the exterior ones. 
Sp. 1. Ascl. mjuuticus. Colour cinereous, either spotted with gray ° r 
Oniscus'aquaticus. Linn. Syst. Nat. i. 1061. Aselle d'eau douce. Geof 
liist. des Insect, xi. 672. pi. 22. f. 2. Squille Aselle. De Geer, Mo 
sur les Insect, vii. 496. pi. 31 .Jig. 1. Aselle ordinaire. Latr. lit* 
Elat des Crust, et des Insect, vi. 359. Ascllus vulgaris. Bose, Iff 
mu. des Crust, ii. 170. pi. 15. fig. 7. Latr. Gen. Crust, et Ins. 
Leach, Edin. Encycl. vii. 404. Idotea aquatica. Eabr. Supp. 
Syst. 303. EnLomon hierogl.yphicum. Klein, Dub. fig. 5. Ascllusaip’^ 
ticus. Leach, Trans. Linn. Soc. xi. 373-— Supp. to Encycl. Brit. i. 
Inhabits ponds and ditches, and is generally considered a sign of & 
purity of the water. 
Stirps 2. Styles of the tail not exserted. Anterior legs simple. 
Genus 32. J.EFwY. Leacli. 
Eyes moderately large, situated between the sides and the vertex oi 
head. _ 
Sp. 1. Ja.albifrons. Cinereous; front whitish. p. 
Oniscus albifrons. Montagu’s MSS. Jtera alhifrons. Leach, Edin- . 
cycl vii. 434. — Trans. Linn. Soc.xi.373. — Supp. to Encycl. Brit, i- ^ 
Inhabits marine plants, and beneath stones on the southern coas 
Devon. 
