304 Dr. Philippi on a new yenus of Entomostraca. 



by its inner branch being triarticulated, whilst the latter have 

 only two joints. The outward branch is in them also triarticu- 

 lated ; the first and second have at the end in front a thick 

 bristle, and posteriorly a similar one in the centre; the last joint, 

 which is twice as long as the preceding, has in front four short 

 strong bristles, and behind five longer weaker bristles. The 

 last pair of feet is again simple, biarticulated ? the last joint 

 longish, slightly curved, and has three spines exteriorly, four at 

 the apex, and one behind, {g.) From the small size of the 

 animal, and as I had only one specimen, I could but very im- 

 perfectly distinguish the cibarian apparatus. Nevertheless I 

 plainly saw, in the first place, behind the antennae, a mandible, 

 consisting of two linear joints of equal length and breadth, 

 the first of which bears posteriorly in the centre a four- 

 branched bristle, and the last one several simple bristles at the 

 end (see fig. 13. a.), manifestly the same organ which appears 

 in a slightly differing form in Hersilia ; in the second place, a 

 foot jaw} likewise consisting of two equally long joints ; the 

 second of these is very narrow, and bears at the apex a short 

 unguis or some very short bristles, (b.) 



The colour of the animal was a dark purplish-red ; the an- 

 tennae, tail, and legs pale red ; the fore margin of the cephalic 

 appendage colourless. 



This genus stands between Hersilia and Sapphirina, and is 

 distinguished from both of them by the different number of 

 thoracic segments and of the feet, as wxU as by the structure 

 of«the first pair of feet. It may be thus briefly characterized : 

 Corpus clypeo magno, e segmentis septem formato obtectum ; 

 segmento primo maximo. Antennae duae magnae sexarticu- 

 latae. Pedum paria sex ; par primum simplex, ungue longo 

 terminatum ; paria secundum, tertium, quartum et quintum 

 ramos duos gerentia ; par sextum simplex. Cauda apice bi- 

 fida et setigera. 



Fig. 12. Peltidum purpureum mihi, natural size. 



Fig. 13. The same lying on its belly, magnified sixty times. 



a. The mandibles. 



b. The foot jaw ? 



c. A foot of the first pair. 



d. A foot of the second, e. of the third, /. of the fourth or fifth, g. of 



the sixth pair. 



