CRUSTACEA. 161 



the external division much flattened, lanceolate, and with hairs 

 having spiked bases and serrated tips on the outer edge ; the 

 hairs also occur generally along the inner margin, and are 

 frequently sheathed in mud and particles of all kinds. The 

 third pair consists of three portions furnished with long branched 

 hairs. The fourth pair has the large flat shield surrounded 

 with branched hairs ; next is a curved tapering portion with 

 bristles having short spikes towards the tip; then come 

 a series of flattened organs with truncate tips covered with 

 spiked hairs. The fifth pair has three divisions — an inner 

 irregular portion with hairs shortly branched on its free 

 edge, a middle and somewhat club-shaped piece with rather 

 stiff serrated hairs scantily spiked at the base, and a 

 curiously curved and rather slender inner portion with 

 about half a dozen finely serrated hairs on one side of 

 its tip. 



The hairs on the outer border of the chelas are densely 

 plumose ; and hence it is exceedingly difficult to clean them 

 from mud and sand for the cabinet. 



Porcellana longicornis, L. ; Bell, op. cit. p. 193. 

 As common as the former, in similar, though not muddy, 

 situations. The embryos are found in the ova in August ■ 

 and many young occur under stones in November and 

 December. 



Fam. Lithodida:. 



Genus Lithodes, Latr. 



Lithodes maia, L. ; Bell, op. cit. p. 165. 



Not uncommon in deep water, whence it is brought by the 

 fishing-boats. 



