CLASS I. CRUSTACEA^ 109 



et Insect, i. 05. Sphceroma serrata. Leach, EJln. Enci/cl. vii. 405. 

 — Trans. Linu. Soc.x'i. COS. — Supp. to Enci/cl. B?it. i. 427. 



** Superior antenne uith a very large peduncle. Claws simple. 

 Genus 25. iEGA. Leach. 

 Eyes large, granulated, oblong, oblique, marginal : tail with its ap- 

 pendages foliaceous. 

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

 rior lamella internally oblicjuely truncated, externally emarginated. 

 iT".ga emarginata. Leach, Trans. Linn. Soc. xi. 370. — Supp. to Encj/cl. 

 Brit. i. 427. pi. 21. 



*** Superior autenn/e ziith a moderate peduncle. 



Genus 16. EURYDfCE. Leach. 

 Eyes distinct, simple, lateral : head as broad as the first segment of the 



body. 

 S]). 1. Eu.pulchra. Tail with the last joint semioval : body cinereou?, 



variegated with black. 



Genus 27. LIMNORTA. Leach. 



Head as broad as the first segment of the body : ei/cs granulated. ' 



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



Liranoria terebrans. Leach, Edin. Enci/cl.\i\. -J33 — Trans. Linn. Soc. xi. 

 ii70.—Supp. to Enci/cl. Brit. i. 428. 



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

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

 shire. It generally jiroduces seven yovmg ones. 



Genus 28. CYMOTIIOA. Fabr., Bald., I^ach. 

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



notched to receive the head. 

 Sp. 1. Cam. (Est rum. 

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



C . Tail furnished with two seta. 

 Fam. VII. Apseudiad.e. 



Genus 29. APSEUDES. I^yich. 



Bo'Jy six-jointed: to7 with six segments; the last largest, armed at the 

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

 ^!id thumb; Xh^ second pair compressed and dentated; the third and 

 foi'rth alike and simple ; the fifth with a double nail ; the sixth and se~ 

 Txnth spurious : the superior antenna with a biarticulated peduncle 

 armed at the apex witli a jointed seta; the inferior antenne^ bilurcate, 



Sp. I. A. Ta/pa. Rostiaira acute, with three excavated Icngiiudina! 

 grooves. 



