406 Mr. Lubbock on new species of Entomostraca. 



Length of cephalothorax '03, of abdomen "012, of lamella '01. 

 Total, -052. Length of antenna -043. 



Colour opake brown ; eye red. Not so numerous as D. 

 Thompsoni, but not unfrequeut. 



Weymouth, October 1857. 



Female. I also caught several specimens of a female, which 

 I believe belongs to this species. It agreed in the general form 

 of the cephalothorax and abdominal lamellse, antennae, maxilli- 

 peds, and first pair of legs. The fifth pair of legs are small, 

 symmetrical, and three-jointed; the apical segment bearing four 

 spines, two at the end and one on each side. The abdomen was 

 three-jointed. 



PL X. figs. 11, 12; PL XL figs. 12, 13. 



PONTELLA. 



The genus Pontia was instituted by Milne-Edwards ; but the 

 name was altered by Dana to Pontella, Pontia having been 

 already used. Before the appearance of Dana's work on Crus- 

 tacea, three species only were known ; but that great naturalist 

 described and figured no less than twenty-seven new species, 

 and divided them into three highly natural groups: 1st, Cala- 

 nopia, the species of which ought rather, I think, to be referred 

 to Diaptomus ; 2nd, Pontellina, having the head unarmed ; and 

 3rd, Pontella, in which it has a reversed spine on each side. 



The present species is the first that has been found in our 

 seas, and may be described as follows : — 



Pontella Wollastoni. 



Frons subtriangulata, apice rotundata. Cephalothorax 7-articulatus, 

 posdce acutus. Oculi magni. Antennoe anticse cephalothoraee 

 non breviores, maris dextra, crassa, prehensilis, setis brevibus. 

 Pedes primi paris, ramo uno 3-articulato, altero 2-articulato. Pes 

 posticus maris dexter, crassus. Abdomen 4-articulatura, stylis 

 setisque caudalibus mediocribus. 



In this species the front is subtriangular, rounded in front. 

 The cephalothorax is seven -join ted, the posterior segment being 

 short and having its angles slightly elongated. The anterior 

 antennse are swollen ; the fourth and fifth segments (counting 

 from the apex) are elongated, and toothed along the inner mar- 

 gin. The setje are short. 



The posterior antenna: have the larger branch only about J 

 longer than the other. 



The maxillce and maxillipeds are as usual. 



The first and fourth pairs of legs have both rami three-jointed. 



The fifth pair (PL XL fig. 11) are as usual. The penultimate 



