452 A CORNISH FAUNA. 



feelers, and eyes separately on footstalks or sessile. The mouth 

 formed by the adaptation of several pairs of appendages varying 

 in separate orders to assist in manducation. The legs with several 

 joints, some of the higher groups being variated into prehensile 

 appendages. Vent at the extremity of the animal." 



"The stalk-eyes Crustaceans possess a carapace or shelly crust 

 above the thorax or Pereion, within which the jDrincipal organs 

 of life are protected, the branchiae or gills for 1 :: eathing are not 

 branched ; five posterior pairs of appendages lalonging to the 

 thorax or Pereion only formed for walking. 



'iThey are arranged by Dr. Milne Edwards in his Histoire 

 des Crustaces, 1830, into three great sections, of which the separate 

 characters are" 



"Brachtuea or short-tailed Crabs, having the pleon or abdo- 

 men, vulgarly called the tail, slightly developed, having none of 

 its appendages adapted for swimming and destitute of fan-like 

 caudal plates," or uropoda. 



"Ajstomouea, abdomen or pleon well developed, with a portion 

 bent under the thorax or pereion, with terminal caudal plates" 

 or uropoda. 



"Macrotiea, abdomen or pleon well developed and extended, 

 having paddles (pleopoda) beneath and terminal fan shaped 

 uropoda or caudal plates." 



The Order of the Brachyura is again divided into the following 

 families, OxyrhyncMd(B, Macropodid(B, Maiadce, Partheiiopidce, Can- 

 ceridce, Portunid(B, Pinnotheridce, Gra/psidce, Leucosiada, Sfc. 



MACROPODWM. (Sea Spiders.) 

 Genus Stenoehynchus. — Lam. 



" Second pair of legs much longer than others ; the stalk 

 of the external antennae inserted before the level of the eyes, 

 of which the footstalk is very short." 



STENORHYNcnus Tenuirostris — Leach — Smaller Sea Spider. 

 „ LoNGiRORTUs — Coicch's ComishFamia 



"Common at the depth from two to twenty fathoms, often taken 

 in crab-pots." 

 " Stenorhynchus Phalangium — Pennant — Long-legged Spider 

 Crab. "Common at the mouth of rivers — Leach ; off the south 

 coast of Cornwall. Bell, C.S.B- 



