96 MODKUX SVSTE\f. 



Bri(. Zool. iv. 14. pi. 15. Jig. 27. Astacus fluviatilis. Fair., Lulr., 

 Leach. 



** Ei/es reniform, abniplly shorter than their peduncles. 

 The coxce of the third pair of legs of the female, of the fifth pair 

 of the male, perforated. 



Genus 28. NEPHROPS. Leach. 

 External antennte with the first joint of their pedimcle furnished at its 



apex with a squama, which is produced beyond the apc.x of the 



peduncle. 

 Sp. 1. Neph. Norvcgicus. Abdomen with hairy areolje ; shell somewhat 



spiny in front. 

 Cancer Norwegicus. Linn. Sj/st. Kai. i. 1053. Astaais Xonvegicus. 



Penn. Brit. Zool. iv. 17. pi. 12. Jig. 24. Ncphrops Norwegicus. 



Leach, Mai. Podoph. Brit. tab. 30. 

 Inhabits the northern parts of Europe. It is foimd in the Frith of 



Forth diirins: the summer monlhs, often attachinsj; itself to the lines 



of the fishermen : colour, when li%ing, flesh red. Fabricius, Bosc, 



and Latreille, cannot have seen this animal, since they all describe 



it as having four instead of six didactyle legs. 



Fam. V. PALiEMONiD.K. 



External antenna: with a large squatna at tlieir base. 



Stirp> 1. — External antenna: inserted in the same horizontal line with 

 tlie interior ones, which ha\ e two seta : tail with the external la- 

 mella composed of but onepart. 



Genus 29. CRANGOX. Latr., Bosc, Leach. 

 Second pair of legs didactyle, of the same length with the third pair : 



pedipalpcs with their last joint obtuse at its point. 

 Sp. 1. Cran. vulgaris. Thorax behind the rostrum, and on each side, as 



well as the arms beneath with a spire. 

 Cancer Crangon. Linni,. Crangon \ulgaris. Fuhr., Leach, Mai. Pod. Br, 



t. 37. B. Common Shrimp. 



Genus 30. PONTOPIIILUS. Leach. 

 Second pair of kgs didactyle, much shorter than the third pair : pedi- 

 palpcs with the last joint acuminated. 

 Sp. 1. Pont. spinosKS. Thorax with five ranges of spines, disposed 



longitudinally ; three ranges dorsal and one on each side. 

 Pontophilus spinosus. Leach, Mai. Pod. Brit. t. 37. A. 



Discovered by C. Prideaux, esq., amongst some rubbish from Ply- 

 mouth Sound ; a second specimen was aftenvards taken off Falmouth 

 by the late John Cranch, Zoologist to the Congo Expedition. 



Stirps 2. — External antenna: inserted below the internal ones : interior 

 ones with two sets inserted in the same liuriionlal line : exterior /«- 

 7>tella of the tail bipartite. 



