Mr. Lubbock on new species of Entomostraca. 407 



segment, or baud, is swollen, and bears at tbc base a long im- 

 moveable spine, wbicb acts in opposition to the still longer curved 

 finger. The left leg appears to consist of two rami. 



Caudal seta as usual ; the fourth (counting from the outside) 

 being the longest. 



Female. The preceding description applies to the male. The 

 female, which I believe to correspond to this species, agreed with 

 the male in the general form of the cephalothorax, which was 

 •07 of an inch in length, but the posterior segment was not very 

 clearly separated from the penultimate. The anterior antennae 

 were rather longer than the cephalothorax; the posterior penul- 

 timate seta was about half as long again as its segment. The 

 other setae scarcely exceeded the length of the segments to which 

 they were attached. The maxillipeds and first pair of legs agreed 

 with those of the male. 



Prof. Dana observes, that the fifth pair of legs in the female 

 do not afford good specific characters in this genus ; but, with 

 all respect for so great an authority, I venture to offer a different 

 opinion, at least as regards all those which I have been able to 

 examine. In this species the two branches are reduced to 

 simple, ovate, inarticulate lobes ; the outer and larger being about 

 5 longer than the other, and having a small tooth on the inner 

 margin near to the apex. 



Colourless, except the bright red eyes. 



Collected at Weymouth in October 1857. 



I have named the species after my friend Mr. AVollaston, so 

 well know"n for his excellent work on the Coleoptera of Madeira, 

 and for other interesting essays on various branches of ento- 

 molosry. 



PL XI. figs. 9, 10, 11 & 18. 



Pontellina brevicornis. 



Frons rotuadata. Cephalothorax 5-articulatus, articulis quatuorpos- 

 ticis subsequis, postice in angulis productus, dextro lougiore ; seg- 

 mento prime non lateribus angulatis. Antennae primae cephalo- 

 thorace breviores, setis brevibus, apicalibus longioribus, articulum 

 longitudine superautibus. Antemiarum posticarum rami non valde 

 iuaequales. Pedes primi, ramis 3-arliculatis. Pedes postici maris 

 crassi. Abdomen o-articulatum, stylis setisque mediocribus. 



This species represents the third of the groups into which 

 Prof. Dana has divided the genus, and consequently wants the 

 reversed spine on the side of the first cephalothoracic segment. 

 The front is rounded, and the posterior corners of the cephalo- 

 thorax are produced into short angles. 



The anterior antennce are shorter than the cephalothorax; 

 some of the apical setae are more than twice as long as the seg- 



