CLASS I. CRUSTACEA. 107 



Genus 18. STENOSOMA. Leach. 

 Evtcrmil antenna: as long as tlie body, tlic third joint longer than the 



fourth: body linear. 

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



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

 Oniscus linearis. Fenn. Brit. Zoul. iv. pL 18. fg. 2. Idotea hectica. 



Leach, Kdin. Emycl. vii. 401. Stenosoma hecticum. Leach, Edin. 



Enct/cl. vii. 433. Stenosoma lineare. Leach, Trans. Lmn.Soc. xi. 366. 



— Sapp. to Enci/cl. Brit. i. 427. 

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



Fortli, and amongst the Hebrides. 



B. Tail on each side, rcith one or tuo appendices. 



Fam. V. AxTHURAD.c Leach. 



A»lenn(E inserted in nearly the same horizontalline: ventral appen- 

 dages closed by two longitudinal plates. 



Genus 19. ANTHURA. Leach. 



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

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

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

 with two elongate lamclke on each side. 



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



Oniscus gracilis. Montagu, Trans. Linn. Soc. ix. lab. 5 4" G. Anthura 

 gracilis. Leach, Edin. Enci/cl. — Trans. LJnn. Soc. — Supp. to Encijcl. 

 Brit. 



Fam. VI. CYMOTnoAD;E. L^each. 



Anlemut inserted in jtairs, one above the other. 



Stir PS 1. Tail with one lamella on each side. 



Genus 20. CAMPTECOPEA. Leach. 



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

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

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

 duncle biarticidate, the space between the antennas very great: an- 

 terior elates bifid. 



Sp. 1. Cam. hirsuta. Brown; the last joint of the body with a few 

 foint blueish spots. 



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

 copca hirsuta. Leach, Trans. LJnn. Soc.xi. 367. — Edin. Encycl. vn.AOj. 

 — Supp. to Encijcl. Brit. i. 427. 



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



Length one eighth of an inch. 



