1 08 
MODERN SYSTEM. 
Genus 21. NJESA, Leach. 
Tai! on each side of the last segment, with a straight subcompressed 
process attached to a peduncle : body six-jointed, the last joint largest: 
antenna setaceous, subequal ; upper ones with a very large biarticu- 
lated peduncle, the lirst joint largest: space between the antenn® 
easily to be discerned : elates bifid. 
Sp. 1. Na. bidentatu. Last segment of the body armed with two spines 
or teeth; colour cinereous, faintly streaked with blue, or reddish. _ 
Oniscus bidentatus. Adams, Trans. Linn. Soc. v. 8. t. 2./. 3. Nssabi- 
dentata. Leach , Edin. Encycl. vii. <105. — Trans. Linn. Soc. xi. 367 • • 
Supp. to Tincycl. Brit. i. 127. 
Inhabits the poasts of Wales and Devonshire. 
Stir ps 2. Tail with two lamellae on each side. 
*■ Superior antenna with a very targe peduncle. Claws bifid. 
Genus 22. CYMODICE. Leach, 
Eyes touching the anterior margin of the first segment of the body: 
body seven-jointed : . tail at the base, on each side with two subconi' 
pressed but not foliaceous appendages, the exterior ones largest; the 
apex of the tail notched, with a lamella in the centre: claws bifid. 
Sp. 1. Cy. truncate. Apex of the tail truncate. 
Oniscus truncatus. Montagu’s MSS. Cymodice truncata. I.each, Edin. 
Encycl. vii. 433. — Trans. Linn. Soc. xi. 303. — Supp. to Encycl. Brit- 
i. 427. 
This species is very rare, and has been found but three times on 
the southern coast of Devonshire. 
Genus 2.3. DYNAMENE. leach. 
Eyes not reaching to the anterior margin of the first segment of the 
body: body seven-jointed: tail with two equal foliaceous appendage 5 
on each side of its base; the apex notched: claws bifid. 
Dynamene. Leach, Edin. Encycl. vii. 433. 
There are several indigenous species of this genus, and their cha- 
racters will be given under the article Cymothoade'es, in the Die- 
tiennaire dcs Sciences Nalurdles, by Dr. Leach. 
Genus 21. SI’HiEROMA. Lair., Leach. 
Eyes not reaching to the anterior margin of the first segment of tb® 
Tody : body seven-jointed : tail with its apex entire; the base on each 
side with two equal foliaceous appendages: claws bifid. 
Sp. 1. Sph. serratn. Body smooth, unarmed: tail very smooth on each 
‘ side ; obliquely truncated: lamellae elliptic, acute, the external ones 
externally serrated. 
Oniscus Globator. Pall. Spec. Zool.fasc. ix. t. 4. f 18. Cymothea s® r ' 
rata. Eabr. Ent. Sysl. ii. 310. Sphasroma cinerea. Latr. Gen. Crust- 
