110 MODERN SYSTEM. 



Cancer Gammarus. IMonlagu, Trans. Linn. Soc. ix. /. 4. /*. G. Apscudes 

 Talpa. Jj^ach, Edin. Encj/cl. vii. 401. — Trans. Linn. Soc.\i. 37'2. — 

 Supj). to Eiicj/d. Brit. 428. vol. i. 



Inhabits the British ocean : length four lines : colour yellowisli-white : 

 is very rare. 



D . Tail furnished with stales. 



Fam. VIII. AsELLiD.i.. 

 Interior antenna distinct. 



Stirps 1. Sttjlcs of tlie tail cxserted: anterior legs monodactyle. 



Genus 30. JAN IRA. Uach. 

 Claws bifid : cijes moderate, lateral-subverlical : internal anlcnna shofter 



than the peduncle of tlie external ones. 

 Sp. 1. Jan. maculosa. Body cinereous, maculated with fuscous. 

 Oniscusmaculosus. Montagu's MSS. Janira maculosa. Leach, Edin. En- 



ct/cl. vii. 434. — Trans. Linn. Soc. xi. 373. — Supp. to E.ncijcl. Brit. i. 428. 

 Inhabits the southern coast of Devonshire, amongst murine plants. 



Genus 31. ASELLUS. Ccoff., Olivier, Latr., Base, Leach. Emo- 



Mol^ hlcin. 

 Claws simple : ei/es minute, lateral : interior antenna of the length of the 



setiferous joint of the exterior ones. 

 Sp. 1. Asel. aquuticus. Colour cinereous, either spotted with gray or 



whitish. 

 Oniscus aquaticus. Linn. Syst. Nut. i.\0&\. Aselle d'eau douce. Geoff. 



Hist, des Insect, xi. (j72.pt. 22. /. 2. Squille Aselle. Be Gccr, Mim. 



sur les Insai. vii. 49G. ;;/. 31. Jig. 1. Aselle ordinaire. Latr. Hist. 



Nat. des Crust, et des Insect, vi. 359. Asellus vulgaris. Bosc, Hist. 



Nat. des Crust, ii. 170. pi. 15. fg. 7. Latr. Gen. Crust, et Ins. i. 63. 



Leach, Edin. Encycl. vii. 404. Idotea acjuatica. I'abr. Supp. Enf. 



Syst.'oOC). Entonion hicroglyphicum. Klein, Dub. Jig. 5. Asellus aqua- 

 ticus. Leach, Trans. Linn. Soc. xi.373. — Supp. to Encycl. Brit. i. 428. 

 Inhabits ponds and ditches, and is generally considered a sign of the 



purity of the water. 



Stirps 2. Styles of the tail not cxserted. Anterior legs simple. 



Genus 32. J^RA. Leach. 

 Eyes moderately large, situated between the sides and the vertex of the 



head. 

 Sp. 1. Ja. albifrons. Cinereous; front whitish. 

 Oniscus albifrons. Montagus MSS. .Trera albifrons. Leach, Edin. En- 



ci/cl. vii. 434. — Tran^. Linn. Soc. xi. 373. — Supp. to Encycl. Brit. i. 428. 

 liihabits marine plants, and beneath stones on the southern coast of 



Devon. 



