MODERN SYSTEM. 
86 
27. Astacus fiuviatilis. Fabr., Lair -t 
Brit. Zool. iv. 14. pi. 15. fg. 
Leach. , 
#* Fi/es reniform, abruptly shorter than tlieir peduncles. 
The coxa of the third pair of legs of the female, of the fifth pair 
of the male, perforated. 
Genus 28. NEPHROFS. Leach. 
External antenna with the first joint of their peduncle furnished at it 
apex with a squama, which is produced beyond the apex of th 
S /l. Nepli. Norvegicus. Abdomen with hairy areola- ; shell somewhat 
spiny in front. . 
Cancer Norwericus. Linn. Syst. Nat. 1 . 1053. Astacus Aorwegicus- 
Penn. Brit. Zool. iv. 17. pi. 12. fig- 24. Nephrops Norwegicus. 
Lcac.li, Mai. Fodoph. Brit. tab. 30. . . , r 
Inhabits the northern parts of Europe. It is found in the Fn h ol 
Forth during the summer months, often attaching itself to the lines 
of the fishermen : colour, when living, flesh red. labncius, Lose, 
and Latxeillc, cannot have seen this animal, since they all descru 
it as having four instead of six didactyle legs. 
Fain. V. PiLiEMONIDJE. 
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 two seta; : tail with the external a' 
mclla composed of but one part. 
Genus 29. CRANGON. Latr., bone, Leach. 
Second pair of legs didactyle, of the same length with the third pan ■ 
pedipalpes with their last joint obtuse at its point.. 
Sp. 1 Grim, vulgaris. Thorax behind the rostrum, and on each side, as 
well as the arms beneath with a spire. . 
Cancer Crungon. Imn'e. Crangon vulgaris. Fair., Leach, Mai. Fod. IF- 
t. 37. B. Common Shrimp. 
Genus 30. PONTOPIIILUS. Leach. 
Second pair of leg* didactyle, much shorter than the third pair : pedi' 
mlpes with the last joint acuminated. , 
gp [ Pont, spinosus. Thorax with five ranges of spines, dispose 
longitudinally ; three ranges dorsal and one on each side. 
Pontophilus spinosus. Leach , Mai. Pod. Bril. t. 31. A. 
Discovered by C. Prideaux, esq., amongst some rubbish from P 3 
mouth Sound ; a second specimen was afterwards taken off r a.moi 
by the late John Cranch, Zoologist to the Congo Expedition. ^ 
Stirps 2. — External antenna inserted below the internal ones : inU v’ 1 
ones with two setie inserted iu the same horizontal line : e.vtcrioi 
metlu of the tail bipartite. 
