118 BRITISH ENTOMOSTRACA. 



communication with it, and is immoveable. It is not 

 composed of crystallines, and its situation is not exactly 

 the same in all the species. 



Jurine says he has only examined it in small indi- 

 viduals, and that in consequence he has not been able to 

 discover its utility. He does not appear to have met 

 with the larger individuals of this family, such as the 

 Eurycercus lamellatus, in which I have examined this 

 spot, but without being able to ascertain any use to 

 which it is applied. I quite agree with him, however, in 

 considering it to be not an organ of vision. 



Straus considers the upper larger spot the only one 

 deserving the name of eye, and this small black spot 

 to be similar to that existing in the Daphniadae ad- 

 jacent to the brain, the relative situation of which is 

 also nearly the same as this black spot in the Lynceidae. 

 We find it in the young before birth exactly as in the 

 adult. 



The antennae are four in number, two superior and two 

 inferior, and are situate as in the Daphniadae. The su- 

 perior antennae (t. XV, f. 1 a) consist each of a solid body, 

 of a somewhat conical shape, and slightly curved, which 

 terminates in six short spines, each of which again gives 

 out a fine seta or bristle. They are not possessed of much 

 motion. The inferior antennae, or rami as they are some- 

 times called (t. XV, f. 1 6), are situate on each side of the 

 base of the head, rather lower than in the Daphniadae, 

 and consist, as in them, of a single joint at the base, which 

 divides into two branches, each having three joints ; they 

 are much shorter in all the species than in the Daphniadae. 

 In the AV/v/rv/Yv/.v /Wr//W//.v (he anterior branch sends oft' 



t/ 



from the last joint three Ion*; filaments or bristles, and a 

 short one, and one from the extremity of the second and 

 iirst joints ; while the posterior branch sends off only 

 three long ones and a short one from the last joint. The 

 long seta^ are each furnished with a joint near the centre, 

 as in Dii/ili/iiu /Wr/ , and, as in it, are beautifully plumose, 

 while the short set;e are neither jointed nor plumose. 



