MONOCULUS. 151 



water, from whence this species of Monoculus 

 has derived its trivial name. In the body of 

 the female the bunch of eggs is very plainly 

 seen through the transparent shelly covering. 

 The eyes are formed of little black globules, 

 situated very near to each other, and invested 

 with a common membrane, which gives them 

 the appearance of unity. 



The insects of this genus are for the most 

 part very minute, insomuch that their delicate 

 structure can by no means be observed by the 

 naked eye ; but there are two, the M . Apus, 

 and M. Polyphemus, which are quite exempt 

 from this inconvenience. The former, an in- 

 habitant of Europe, is nearly an inch and three 

 quarters long; and the latter, a native of India, 

 and better known by the name of the Molucca 

 Crab, may rather be considered as one of the 

 largest of the Cancri, than an insect belonging 

 to this genus. 



SPECIFICATION. 



Monoculus Pulex. M. antennis dichotomis, Cauda 

 inflexa. Linn. Syst. Nat. 1. p. 1058. GmcL 1. 



