S.A. NAT., VOI.. XVI. 
March 24. 1937. 
49 . 
By Kt'ith S heard. 
If a little water is poured into the enamel bowl and the 
strainer cloth washed in . this, the various specimens very soon 
settle down to their normal affairs. The Crustaceans belong 
mainlv to two Amphipodan genera Urohaustorius and Exoediceros 
— sand-diggers both. Urohaustorius , a little parchment ball of 
chitin with flattened antennae and a red spot on the hinder 
margin of the two rear legs — for all the world like the colour 
patches on some monkey rumps — Exoediceros , longer and more 
slender, with his rearmost legs longer than his body, which is 
speckled with dark chromatophores. Some Marine Worms will 
be there, and perhaps a few of those very small, exquisitely 
adapted tunnelling machines — the Cumacea, probably of the 
genus Gephyrocuma or Picrocuma . 
Gephyrocuma pal a Hale; a, female, b , dorsal view of 
carapace, c, male. (After Hale). 
* Exoediceros is seldom still, but skates madly, upside down, 
hanging to the under-surface of the surface film, suddenlv diving 
every now and again to the bottom. Urohaustorius creeps on 
the enamel, his expanded antennae feverishly quivering and tap- 
ping as he tries to dig in. The worms unwisely wriggle, ana 
advertise their presence, and promptly vanish into hungry crust- 
acean stomachs, 
