OE LIFE-HISTOET 01" CEETAIN ACARINA. 393 



The first leg (fig. 6) lias tlie tarsus and penultimate joint fused 

 into one considerably enlarged mass, as in Fygmepliorus, termi- 

 nating anteriorly in a clear, chitinous projection, which carries 

 an extremely large, sharply-bent, monodactyle claw, without 

 suet er or caruncle. The enlarged terminal joint has a thinner 

 ridge on its upper surface, bearing two very long hairs or spines, 

 with two laurel-leaf-shaped pieces and a short spike between 

 them. There are two strong curved hairs on the underside of 

 this joint, and a few similar on the other joints. The second and 

 third pairs of legs have the tarsus terminated by a didactyle claw, 

 with a small caruncle between the ungues. These legs are 

 abundantly haired, but there is not any hair which attains special 

 prominence. The fourth pair of legs (fig. 9) have the first (basal) 

 joint very thick and long ; the other joints diminish in size 

 regularly and rapidly. The tarsus does not bear any claw or 

 caruncle, but terminates in two extremely long and powerful 

 setse, of which one is straight and the other curves towards it ; 

 the same joint bears three other curved setae, which are smaller, 

 but still large, and there are one or two setae on the other joints. 



The whole body is attached to the dorsal carapace by a mem- 

 brane, which covers the ventral surface and lines all parts of the 

 carapace. 



The alimentary canal shows plainly from the dorsal aspect. It 

 consists of a long oesophagus, forming a slight ingluvies at the 

 posterior end ; a valve divides this from an almost globular ven- 

 triculus, from the posterior end of which proceeds the hind gut, 

 very obscure, and almost entirely or quite hidden by the opaque- 

 white excretory organs which overlie it. Erom these last-named 

 organs a straight median passage may easily be traced to the 

 anus, which lies at the posterior edge of the carapace (ventral 

 surface). 



Prom the ventral aspect a main tracheal trunk may be seen on 

 each side, proceeding from the rostrum and running nearly 

 straight backward below the alimentary canal, and there are 

 important tracheae supplying the legs &c. 



All the internal organization can be seen much more plainly 

 in the female than in the male. 



Larva. 



Colourless, seraitransparent. Texture smooth, almost polished. 

 General form elliptical, margin lobed. The creature shows 



