CLASS I. CRUSTACEA. 107 



Genus 18. STENOSOMA. Leach. 

 Exfernal antemue as long as the body, the third joint longer than the 



fourth : bodi; linear. 

 Sp. 1. St. iiiiearc. Last segment of the tail somewhat narrowed at its 



base, and dilated towards its apex, which is truncate and notched. 

 Oniscus linearis. Penn. Brit. Zool. iv. ;;/. 18. fig. 2. Idotea hectica. 



Jj^ach, EcHh. Enn/cl. vii. 404. Stenosoma hecticum. Leach, Edin. 



Encycl. vii. 433. Stenosoma lineare. Leach, Trans. Linn. Soc. xi. 360. 



—Sapp. to Encycl. Brit. i. 427. 

 Inhabits the European ocean. It sometimes occurg in the Firth of 



Forth, and amongst the Hebrides. 



B. Tail on each side, zcith one or tzco appendices. 



Fam. V. AxTHURAD.T.. L^each. 



Afilrnna; inserted in nearly the same horizontal line: ventral appen- 

 dages closed by two longitudinal plates. 



Genus 19. ANTHUKA. Leach. 



Antemue short, subequal ; inserted one after another in the same ho- 

 rizontal line, the internal ones a little longest : bod^ linear : tail 

 with the last joint but one very short; the last elongate, narrower, 

 with two elongate lamella? on each side. 



Sp. 1. An. gracilis. Lateral processes of the tail obliquely truncated. 



Oniscus gracilis. Montagu, Trans. Linn. Soc. ix. tub. 5 Sr 6. Anthura 

 gracilis. Leach, Edin. Encycl. — Trans. Linn. Soc. — Sapp. to Enci/cL 

 Brit. 



Fam. VI. Cymotiioad.^. Leach. 



Antenna^ inserted in pairs, one above the other. 



SriRPS 1. Tail with one lamella on each side. 



Genus 20. CAMPTECOPEA. L^each. 



Tail with its last segment furnished on each side with a compressed, 

 curved appendage : bodi/ six-jointed, the last johit of the same size 

 with the others : antewur setaceous, upper ones longest, their pe- 

 duncle biarticulate, the space between the antenna very great: an- 

 terior cluws bifid. 



Sp. 1. Cam. hirsuta. Brown; the last joint of the body ^^■ith a few 

 faint blueish spots. 



Oniscus hirsutus. Montagu, Trans. Linn. Soc. vii. t. 6.f. 8. Camptc- 

 copea hirsuta. LcucIt,Trans. Linn. Soc.xi. 2>67.—Edin. Encycl.yn. 40j. 

 — Supp.to Encycl. Brit. i. 427. 



Inhabits the southern coast of Devonshire, but is rather rare. 



Length one eighth of an inch. 



