OF NATURE. 
lit 
of them exa&ly oblerve the times of coming and 
going, and that they do not miftake their way. 
There is a very large fhell-fifh in the Medi- 
terranean called th t pinna, blind as all of that 
genus, but furnifhed with very ftrong calca- 
reous valves. (Bell, aquat. 401. t. 401. Jonft. 
exfang. t. 16. f. 5, 6. Gualt. ind. t. 79, 79.) 
The fcuttle-fifio (Bell, aquat. 330. t. 331. Jonft:. 
exfang. t. 1. f. 1.) is an inhabitant of the fame 
fea, and a deadly enemy to the former ; as 
foon as the fcuttle-fijh fees the pinna open its 
{hell, he rufhes upon her like a lion, and de- 
vours her. The pinnoteres or pinnophylax 
(Jonft. exfang. t. 20. f. 3.) is of the crab kind 
naked, like the hermit, and very quick-fight - 
ed. This cancer or crab the pinna receives 
into her covering, and when ftie opens her 
valves in queft of food, lets him out to look for 
prey. During this the fcuttle-fijh approaches ; 
the crab returns with the utmoft fpeed and 
anxiety to- his hoftefs, who being thus warned 
of the danger flints her doors, and keeps out 
the enemy. That very fagacious obferver D. 
D. Haffelquift in his voyage towards Paleftine 
beheld this curious phenomenon, which tho 9 
well known to the antients had efcaped the 
moderns. Arift. hift. lib. 5. c. 15. relates. 
mat 
