CLASS I. CRUSTACEA. 106 



Sp. 1. Jan. pulchella. Thumb of the second pair of legs with its internal 



edge notched at the base; colour white painted with red. 

 A'ar. a. Hands of the second pair with an elongate obtuse tooth. 

 Var. /3. Hands of the second pair \\ ith the internal edge tridentate. 



Jassa pulchella. Leach, Edin. Enci/cl. vii. 433. — Trans. Linn. Soc. xi. 



3(31. — Siipp. to Enci/cl. Brit. i. 4^6. 

 Inhabits the sea of southern Devon amongst fuci. 



Subdivision 2. — Second pair of legs zcith a moderate-sized hand. 



Genus 13. COROPIIIUM. Latr., Leach. 

 Sp. 1. Cor. longicorne. ' 



Cancer grossipes. Linn. Sj/st. Nat. i. 1055. Astacus grossipes. Penn. 



Brit. Zool.'iv. pi. 16. ^^'.*31. Corophium longicorne. Latr. Gen. 



Crust, ct Lnsect. i. 59. Leach, Edin. Enci/cl. vii. 403 — 432. — Trans. 



Linn. Soc. xi. 662. — Si(pp. to Encycl. Brit. i. 426. 

 Lihabits the coast of the European ocean. At low tide it may be o\>- 



served crawling amongst the mud. It is very common at the mouth 



of the river ]Mcd\vay, where it was first observed by J. Hcnslow, esq. 



Section II. 

 Body depressed: antenna four: legs fourteen. 

 A. Tail without appendices. 



Fam. III. Caprellad.e. Leach. 

 Bodjj with all the segments bearing legs. 

 Stirps 1. -Bo(/y linear. 



Genus 14. PROTO. Leach. 

 Second, third, and fourth pair of legs appendiculated at their bases. 



To this genus belongs Squilla pedata, and probably also venlricn.':a 

 of Miiller, with Cancer Guinmarns pedatus of Montagu, which is prc- 

 bably the same with S. pedata of MiiUer. See Transactions of the Li::- 

 nean Society, vol. xi. p. 6. t. 11. f. 6. 



Genus 15. CAPRELLA. Lamarch, L.atr., Base, L.each. 

 Second, third, and fourth pairs of legs not appendiculated at their bases; 

 the third and fourth pairs spurious, subgelatinous, and globose. 



The animals com.posing this genus inhabit the sea, living amongst 

 Sertulariae and marine plants, moving geometrically like the larvai of 

 the Phal/enadtv. 



The specific character may be taken from the nimiber and situ- 

 ation of the spines on the head and back, form of the second pair of 

 legs, &c. 

 Sp. 1. Cap. Fhasma. Hands of the second pair of legs narrow, their in- 

 ternal edge acutely notched backwards: back anteriorly with three 

 spines, turning forwards. 



