58 On Australian Entomostracans. 



The eye is simple, no traces of crystallines having been 

 discovered. It varies much in colour. It is generally 

 single, but there are two eyes in Newnhamia. The 

 superior antennae, consisting of seven articulations, which 

 carry a pencil of long setee, and the inferior or the an- 

 tennules (or as I shall henceforth call them the rami), 

 composed of five joints, form together the principal organs 

 of progression. Except in Candona, the rami carry a 

 pencil of long seta3, springing from the extremity of the third 

 joint,* and by means of these rami with the antennae, the 

 little creature is able to swim through the water with con- 

 siderable rapidity and steadiness. 



The mouth is situated on the inferior surface of the 

 thoracic portion of the body, and consists of a lip, an 

 inferior lip, a pair of palpiferous mandibles armed with 

 strong teeth, and two pairs of foot jaws, both of which, at least 

 in Australian species, carry a branchial plate fringed with 

 long thick setee. 



There are two pairs of feet, the first of which is used in 

 creeping on plants, or on the mud. These spring from the 

 thoracic portion of the body, and are directed forwards, 

 and terminated by along hook; the second pair are slender, 

 directed backwards, and seem intended to support the 

 ovaries ; the abdomen is terminated by a moveable bifid tail. 

 I have been much interested in finding, in two instances, the 

 reproductive organs largely developed; I believe they have 

 not previously been met with, or at least described, in any of 

 the Ostracoda. In Cypris carinata, and in Newnhamia 

 fenestrata, the sexes are easily distinguished, and the males 



* Jlr. Baird calls this the fourth joint, from which the setae spring. But 

 if this be the case, (which I will not venture to dispute, though I have not 

 been able in that case to find the first joint), the Australian species must 

 have six joints in each ramus. 



