. ( ^^9 ) 



letters E F G K appears a kind of muicular part, void of optical or- 

 gans, and this part I concluded was what ferved to move the eye. 



Farther, I concluded for certain, that in like manner as every op- 

 tical organ in the eye of a fly has its optic nerve, fo in the eyes of 

 Shrimps every optical organ mull have its proper optic nerve. I 

 therefore opened many of the eyes of Shrimps, and not only difco- 

 vered a great number of minute optic nerves, but alfo a great quan- 

 tity of pellucid particles, every where mixed with thofe optic nerves. 

 Hereupon I began to confider whether or no thofe pellucid particles 

 (which often appeared to me rather oblong and fomewhat crooked) 

 might not each of them be the cryftalline humour of one lingle and 

 individual optical organ, and that their being of the oblong and 

 crooked fliape I have mentioned, might be occafioned in the diffec- 

 tion of the tunica cornea, whereas thofe particles were, in their na- 

 tural ftate, of a perfedly fpherical fhape, and filled the whole internal 

 cavity of their refpedive optical organs. And, in this opinion I 

 was confirmed when, upon more carefully attending to the Shrimp's 

 eye, I perceived the tunica cornea to have a whitilh appearance, and 

 the optic nerves, in the parts towards the infide of the head, to be 

 of a dark appearance, and, when feparated frorrt each other, exhi- 

 bited a violet colour. I alfo concluded, that if it were poffible to 

 take out the eye of a Shrimp,, in fuch a manner as to preferve the 

 cryftalhne humours within the cavities of the tunica cornea in their 

 perfedl fhape, uninjured, I might place them before the fight, and 

 that, doubtlefs, I fhould fee the objeds through them as clearly and 

 difl;indly as when viewed through the eyes of flies. 



In the next place, I was defirous of knowing what was the food 

 of the Shrimp, and I had obferved that the part in thefe creatures, 

 which we call the head, and which when we eat them we throw 

 away, was not only the head, but, for the greatefl: part, the belly of 

 the Shrimp, whence I concluded that there its llomach might be 

 found. 



