394 



'the geologist. 



Fig. 1.— Ideal composition of the hitherto I Fig. 2.— The same seen sideways, 



known parts of the Clytea Leachii. 



a, frontal spine of the Cephalothorax ; b, orbital spines ; c, nuchal furrow ; d, branchial 

 furrow; e, hinder forked furrow; f, shallow furrow passing from the branchial furrow 

 towards the lateral protuberance (h) if the middle part of the cephalothorax ; g, short furrows 

 running from the nuchal furrow forward; i, side-piece of the middle division of the cephalo- 

 thorax, which stretches forwards under the front portion ; k, smooth border of the cephalo- 

 thorax ; I, long joint (femur) of the finger-foot; m, short joint (tibia) of the finger-foot; 

 n, oarpufl j o, Qxed fiuger of the pincers ; q, gr, q", q"\ walking feet ; r, r', cheld of the first 

 two pairs of walking feet; s, claw-like end-joint of the hinder two pairs of walking feet; 

 t, Brs1 : It, second ; r, third ; w, fourth ; x, fifth ; y, sixth ; z, seventh hinder body-rings. 



a, undivided middle lappet of the swinrming foot ; B, outer antenna? ; y, hindermost mas- 

 ticatory foot j </, first; E, second; G, third; y, fourth; I, claw-like last joint of the same. 



