CLASS I. CRUSTACEA. 109 



ct Insect, i. G5. Spharoma serrata. Leach., Edin. Encycl. vii. 405. 

 — Trans. Linn. Soc.\\. 303. — Supp. to Encycl. Brit. i. 42?. 



** Superior antennce with a vay large peduncle. Claws simple. 



Genus 25. 7EGA. Leach. 



Etjcs large, granulated, oblong, oblique, marginal : fail with its ap- 

 pendages foliaceous. 



Sp. 1. JEga emarginata. Tail with the last joint acuminate; the inte- 

 rior lamella internally oliliquely truncated, externally emarginated. 



iEga emarginata. Leach, Trans. Linn. Soc. xi. 370. — Supp. to Encycl. 

 Brit. i. 427. pi. 21. 



*** Superior antenna with a moderate peduncle. 



Genus 20. EURYDICE. Leach. 

 Ei/es distinct, simple, lateral : head as broad as the first segment of the 



body. 

 Sp. 1. Eu.pnlchra. Tail wilh the last joint semioval : body cinereous, 



variegated with black, 



Genus 27. LIMNORIA. Leach. 



Head as broad as the first segment of the body : ci/es granulated. 



Sp. 1. Lim. terebrans. Body cinereous: eyes pitchy black. 



Lnnnoria terebrans. Leach, Edin. Encj/cl. vii. 433 — Trans. Linn. Soc. xi. 

 370. — Supp. to Encycl. Brit. i. 428. 



Inhabits the British ocean, perforating buildings of wood, piles, &r. It 

 is common at the Bell-rock, and on the coasts of Sutilolk and York- 

 shire. It generally produces seven young ones. 



Genus 28. CYMOTHOA. Fair., Dald., Leach. 

 Head narrow and small: eyes obsolete: body with the first segment 



notched to receive the head. 

 Sp. 1. Cym. (Est rum. 

 Cymothoa CEstrum. Fabr. Leach, Supp. to Encycl. Brit. i. 428. 



C . Tail furnished with two sette. 



Fam. VII. APSEUDIAD.S. 



Genus 29. APSEUDES. Leach. 

 Eo.'/;/ six-jointed : fai/ wilh six segments; the last largest, armed at the 

 apex with appendices: feet fourteen; the anterior pair wilh a finger 

 and thumb; the second pair compressed and dentated; the thir<l and 

 fourth alike and simple ; the fifth with a double nail; the sixth and se- 

 venth spurious : the superior untenn(e with a biarticulated peduncle 

 armed at the apex with a jointed seta; the inferior antenna: bifurcate. 



Sp. 1. A. Talpa. Rostrum acute, with three excavated longitudinal 

 grooves. 



