f'G MODE UN SYSTEM. 



Biif. Zool. iv. 14. pL 15. f;^. 17. Astacus fliiviatili^. Fuhr., Lutr., 



Leach. 



** Eyes reniform, abniplh/ shorter than their pcdnncJea. 

 The coxa; of the third pair of legs of the female, of the hflh pair 



of the male, perforated. 



Genus 28. NEPHROPS. Leach. 

 E.itermd uutenna; with the first joint of their peduncle furnished at its 



apex with a squama, which is produced 'beyond the apex of the 



peduncle. 

 Sp. 1. Ncph. Norvegkiis. Abdomen with hairy areola: ; shell somewhat 



spiny in front. 

 Cancer Norwegicus. Linn. S^st. Nat. i. 1053. Astacus Norwegicus. 



Peiin. Brit. Zool. iv. 17. pi. 12. Jig. 21. Nephrops Norwegicus. 



Leach, Mai. Podoph. Brit. tab. 3(3. 

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



Forth during the summer months, often attaching itself to the lines 



of the fishermen : colour, when living, flesh red. Fabricius, Bosc, 



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



it as having four instead of six didactylc legs. 



Fam. V. Pal^monid.?:. 



External antenna: with a large squama at their base. 



Stirps 1. — External antenna; inserted in the same horizontal line with 

 the interior ones, which have tvvo seta; : tail with the external la- 

 mella composed of but one part. 



Genus 29. CRANGON. Lair., JBo.?c, Leach. 



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

 pedipalpes with their last joint obtuse at its point. 



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

 well as the arms beneath v.ith a spire. 



Cancer Crangon. Linne. Crangon vulgaris. Fair., Leach, Mai. Fod. Br. 

 t. 37. B. Common Shrimp. 



Genus 30. PONTOPHILUS. Leach. 



Second pair of legs didactyle, muc-.h shorter than the third pair : pedi- 

 palpes with the last joint acuminated. 



Sj). 1. Pont, spinosus. 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 afterwards taken off Falmouth 

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



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

 ones with two set« inserted in the same horizontal line : exterior la- 

 mella oi the tail bipartite. 



