CRUSTACEA. 



61 



the position of a straight line. I could detect no spine on the 

 anterior part of the carapace, which was quite smooth, but 

 marked with dots. The eyes are sessile and large, the claws, 

 particularly towards the extremity, covered with minute hairs." 



The figures of the young or zoea form are given in Mr. Bell's 

 work from Mr. Couch's drawings, who says that an ordinary 

 sized Corwich bears at one time upwards of seventy-six thousand 

 eggs. 



PARTHEN0PID2E. (Parthenopians. ) 



GrENTIS, ElJRYNOME. 



"Eyes retractile ; joint of the hand more or less triangular and 

 armed. First joint of the outer antennae fused with the frontal 

 plate, and giving insertion to the next articulation on the fore 

 part of the level of inner canthus of the eye." 

 Eurynome aspera. — Kough Eurynome. — Milne Edwards, Hist, 

 des Crust., fig. 1, p. 357 ; Leach, JUalac., p. 17; Pennant, p. 9, 

 fig. 20 ; Bell, Hist. Brit. Stalk-eyed Crust., p. 46. 

 There is a specimen in the museum of the Athenaeum at 

 Plymouth. 



"The length of the legs in this family of Crabs necessarily leads 

 to slowness of motion ; but they are well fitted to a residence 

 among rocks and stones covered with seaweed, among which 

 they stride with little difficulty. In the winter, they become 

 almost, if not altogether torpid, concealing themselves at this 

 season either in deep crevices of rocks or embedded in the soil ; 

 for the Corwich crab has been observed when caught at the time 

 of its first activity in April to have the inequalities of its 

 carapace covered with the mud of the bottom. It is perhaps 

 at this period of repose that the crops of seaweed and corallines 

 (Sertularia &c.) fix themselves, as they are often seen beautifully 

 adorning them ; shells of different species, but especially oysters 

 and mussels, are also found adhering, and on the smaller kinds, 

 as of the Genera Inachus and Pisa, and sponge will grow so 

 luxuriantly as to conceal the whole carapace with tufts from the 

 legs to the extremities. 



"In the spring the spider crabs appear in water of the depth of 

 a few fathoms; but as the weather grows warmer they approach 

 the shore and in summer climb the rocks, so as sometimes to bo 

 left by the receding tide. At the season of the greatest activity, 

 the corwich crab becomes so abundant that as no one thinks of 



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