110 MODTRN SYSTEM. 



Cancer Gammarus. Alontagu, Trans. Linn. Soc. ix. f. 4. f. 6. Apscudes 

 Talpa. Leach, Ediii. Emycl. vii. 40-i. — Trans. Linn. Site. xi. 377. — 

 Supj). to Ena/cl. Brit. 4'2U. vol. i. 



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

 is very rare. 



D. Tail furnished with stijles. 



Fam. VIII. AsELLiD.^. 

 Interior antenna distinct. 

 Stiups 1. Stt/ks of the tail exserted: anterior legs monodactylc. 



Genus 30. JANIRA. Leach. 

 Claws bifid : cijcs moderate, kiteral-subvcrtical : internal antenna:, shorter 



than the peduncle of the external ones. 

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

 Oniscusmaculosus. Montagu's 2ISS. Janira maculosa. Leach,Edin. En- 



ci/cl. y'li. 431. — Trans. Linn. Soc. xi. 373. — Snpp. to Emycl. Brit. i. 428. 

 Inhabits the southern coast of Devonshire, amongst marine plants. 

 Genus 31. ASELLUS. Geoff., Olivier, Latr., Bosc, Leach. Ento- 

 MON. Klein. 

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



setiferous joint of the exterior ones. 

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



whitish. 

 Oniscus aquaticus. Linn. Syst.lS[at.\.10Q\. Aselle d'eaudoucc. Geoff. 



Hist, dcs hisect. xi. 672. 7;/. 22. /. 2. Squille Aselle. Be Gcer, Man. 



sur Ics Lisect.vu. 496. pi. i^-fg- 1- Aselle ordinaire, Latr. Hist. 



Nat. des Crust, et des hisect. vi. 33f>. Asellus vulgaris. Bosc, Hist. 



Nat. dcs Crust, ii. 170.;?/. 15. jig. 7. Latr. Gen. Crust, ct Lis.i. 63. 



Leach, Edin. Encycl. vii. 404. Idotea aquatica. Fuhr. Sapp. Ent. 



Si/st.'Mli. Entomon hieroglyphicum. Klein, Bub. fig. 5. Asellus aqua- 

 ticus. Leach, Trans. Linn. Soc. xi.373. — Supp. to EncycL Brit. i. 423. 

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



purity of the water. 



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



Genus 32. JiliRA. Leach. 



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

 head. 



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



Oniscus albifrons. Montagus MSS. Ja^ra albifrons. Leach, Edin. En- 

 cycL vii. 434. — Trans. Linn. Soc. xi. 373. — Supp. to Encycl. Brit. i. 428. 



Inhabits marine plants, and beneath stones ou the southern coast of 

 Devon. 



