55 Zoological Society. 



December 10.— Prof. Owen, V.P., F.R.S., in the Chair. ' 



Description of several new species of Entomostraca. 

 By W. Baird, M.D., F.L.S. etc. 



Genus Lepidurus, Leach, 



1. Lepidurus viRiDis, Baird. 



Body of animal, including the flap of tail segment, about two inches 

 long and one broad. The carapace and whole body are of a fine green 

 colour, the carapace covering about two-thirds of the abdomen ; the 

 edges of the notch in the posterior part of the carapace are strongly 

 toothed, and those of the inferior half of the carapace are very finely 

 serrated ; these teeth are of two sets, the one much larger than the 

 others ; the larger teeth are of a green colour, tipped at the point 

 with dark brown ; they are about eleven in number, and between each 

 there are two or three much smaller ones interspersed. The appen- 

 dages of the first pair of feet are very short and small, scarcely ex- 

 tending beyond the edge of the carapace. The segments of the abdo- 

 men are each studded with a row of stout, slightly curved spines of a 

 green colour tipped at their edges with dark brown. The tail flap is 

 oval, keeled down the centre, the keel being beset with short sharp 

 spines, and the edges of the flap are finely serrated. The long setae 

 of the tail are nearly the length of the whole animal, and are covered 

 with short hairs. 



Hab. Van Diemen's Land. British Museum. 



Genus Cypris, Muller. 



1. Cypris Donnetii, Baird. 



Carapace valves elongate oval. Anterior extremity narrower than 

 posterior, and considerably flatter ; posterior extremity rounded and 

 very convex ; dorsal edge arched ; ventral slightly reniform. The 

 surface of the valves is smooth and shining, of a brown colour, varie- 

 gated with patches of a darker shade. The pediform antennee are 

 provided with about six bristles of considerable length. 



Hah. Freshwater ponds, Coquimbo ; collected by — Donnet, Esq., 

 Surgeon R.N. Brit. Mus. ; from the collection of H. Cuming, Esq. 



2. Cypris cuneata, Baird. 



Carapace valves wedge-shaped, much broader at anterior than poste- 

 rior extremity. Dorsal margin highly arched ; ventral deeply sinuated 

 in the centre, giving the shell a reniform appearance. Valves very 

 convex in the centre, and surrounded by a prominent margin, which 

 at the anterior extremity, when highly magnified, is seen to be mi- 

 nutely and finely serrated. The whole carapace is of a deep green 

 colour, and covered with fine hairs. 



Hab. Duddingston Loch, near Edinburgh; August 1850. 



Genus Candona, Baird. 

 1. Candona lactea, Baird. 

 Carapace valves oblong ovate, convex. Dorsal margin nearly 



