266 
The Natural Hiftory of the Book IX, 
It is thought to have derived its Name from its frequent Change of its 
Quarters; for its firft Appearance is generally in a very {mall Periwinkle-fhell ; 
as it grows too big for this, it looks out for another empty Shell, agreeable 
to its prefentBulk ; foon after, it takes up its Abode in a large Wilk-thell. 
It hath two Claws, refembling thofe of a Crab. 
The Tail-Part affords a great Quantity of Oil, which is looked upon 
to be of great Service to lubricate fwoln or ftiff Joints. 
Thefe are often found cleaving to Rocks in the Sea, but oftener in 
Granaries on Shore, where they deftroy much Corn. 
The Tail, or the hinder Part, is covered witha thin Skin. 
This is delineated in Plate KXV. Fig. 2. 
. The HorNED CRAs. 
HIS Crab is of a middle Size. 
The Shell upon the Back, in fome Places, is much elevated, and 
again indented. 
Its Head is guarded with two Pair of Horns, both very ftrong, and 
fharp-pointed ; the one Pair about an Inch and an half long, the other 
not above half an Inch. . 
Each Side of the Trunk or Body is likewife armed with four fharp 
Prickles, refembling a Cock’s Spur. 
The Body is fupported by four Legs on a Side, befides two long. feed- 
ing Claws, each ending in a Forceps. 
The whole Crab is covered with brownith pluthy Hairs, 
As to the reft of its Make, it differs from other Crabs, in that its Shell 
is longer in proportion than moft other Crabs, the Sir-Eager excepted, and 
more fharp-pointed than any towards the Head. 
This is delineated in Plate XXV. Fig. 3. 
The SEA Gocr Rocu. 
HIS is of the Crab-Kind, and about an Inch long, 
Its upper Shell, which is of a brownifh White, freckled with Black, 
much refembles, in its Make, that of a ‘Tortoife. 
The Head is provided with two hairy Feelers, like the Land-Cock- 
Roch. 
It hath likewife near the Mouth two long Legs, or Providers, one confi- 
derably longer than the other. _ 
The Body is likewife fupported by fix other fhorter hairy ftrong Legs. 
The Tail-Part ends in a fharp-pointed Flap, which covers Part of the 
Belly, and in the Females is the Repofitory of the Spawn. 
Thefe live in Holes in the Sand, in the Wath of the Water. 
They are fometimes eaten ; and have a Crab-like Tafte. 
SEALE, S 
