CRUSTACEA. 453 



Genus Achjeus. — Leach. 

 " Snout not much, lengthened, and on each side leaving un- 

 covered the insertion of the stalk of the external antennae. The 

 terminal joint of the two posterior pairs of legs is large, com- 

 pressed and falciform." 



AcH^us Ckanohii. — Leach. — CraneWs Spider Crah. — Not common. 

 Deep water among weed, and from its small size probably 

 frequently overlooked." 



Q-ENUS Inachus. — Fabr. 



" Differing from the two former genera in having retractile 

 eyes capable of extensive motion, second pairs of legs thrice as 

 long as the first-frontal portion of the carapace ; terminal portions 

 of the four hinder pairs similar and slender." 

 Inachus Dorsetensis. — Leach. 



,, Scorpio — Couches Cornish Fauna — ^^ Scorpion Spider 



Crab. — Commonly taken in crab pots within a few miles of 



the shore at all depths." 

 "Inachus Dorhynchus — Leach — Feeble Inachus. — Common, not 



unfrequently found on board crab boats." 

 ' 'Except in the rostrum it has much of the aspect of Stenor- 

 hynchus longirotris, but is less common." 

 Inachus Leptochirus. — Leach. 



,, Leptorhinchus — erroniously given by Edwards and 

 Couch — Small Snouted Inachus. — Taken off the coast of 

 Cornwall by Cranch. 



MAIAB^. (Maians.) 

 GrENUS Pisa. — Leach. 



" Eostrum much developed, stout, formed of two lengthened 

 horns, somewhat conical ; stalk of the external antennae nearly 

 on the level of the rostrum." 



"Pisa Texraodon — Milne Edwards, Crust., Vol.1, p. 305 — Four- 

 horned Spider Crab. — Much larger than the other sjjider 

 crabs and far more formidable in appearance. Not common." 



Pisa Q-ibbsi. — Leach. — Gibbs^ Spider Crab. Not uncommon 

 in from about twenty fathoms of depth, and taken in crab- 

 pots." 



