CLASS T. CRUSTArrA. 105 



Sp. 1. Jiif!. pulc/ielhi. Thumb nfthc second pair of legs with its internal 



edge notched at tlie l)use; colour white painted with red. 

 Vav. a. Hands of the second pair with an elongate obtuse tooth. 

 A'ar. ^. Hands of the second pair with tlie internal ed;^e tridentate. 



Jassa pulchclla. Leach, Edln. Encj/cl. vii. 133. — Trans. Linn. Soc. .xi. 



3G1. — Siipp. to Enci/cl. Brit. i. ViO. 

 Inhabits the sea of southern Devon amongst fuci. 



Sid)division 2. — Second pair of legs with a moderate-sized hand. 



Genus 13. COROrHIU.M. Lair., Leach. 



Sp. 1. Cor. longicorne. 



Cancer grossipes. Linn. Sj/st. Nat. i. 1055. Astacus grossipcs. Peim. 

 Brit. Zool.iv. pL 16. Jig. 31. Corophium longicorne. Latr. Gen. 

 Crust, et Insect, i. 59. Leach, Edin. Encj/cl. vii. 403 — ^32.— Trans. 

 Linn. Soc. xi. 662. — Supp. to Enci/cl. Brit. i. 426. 



Inhai)its the coast of the European ocean. At low tide it may be ob- 

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

 of the river JMedway, where it was first obser\'ed by J. Ilcnslow, esq. 



Section IT. 

 Body depressed; antenna four: legs fourteen, 

 A. Tuilzcilhout appendices. 



Fam. 111. C'aprcllad.i.. Leach. 

 Bodi/ with all the segments bearing legs. 



Stjups 1. BodjjVxnc^Xr 



Genus 14. PROTO. Leach. 

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



To this genus l>elongs SquUla peduta, and probably also T'eH/wosa 

 of INIidler, with Cancer Gammarus pedatus of Montagu, which is pro- 

 bably the same with S. pcrA/toof Miilier. See Transactions of the Lin- 

 7iean Society, vol. xi. j). 6. t. 11- f- 6. 



Genus 15. CAPRELLA. Lamarck, latr.. Base, Leach. 

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

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



The animals composing this genus inhabit the sea, living amongst 

 ScrtularicB and marine plants, moving geometrically like the larvai of 

 the FhahenadiB. 



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

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

 legs, &.C. 

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

 ternal edge acutely notched backwards : back anteriorly with three 

 spines, turning forwards. 



