224 «lUIiEli RICHAR». 



cularly in Ihe variely marked B [D. Kingii de Schôdler). 

 The anlerior part generally cornes to a sharp point. The 

 front view of the head has a singularly carinated appea- 

 rance. The superior antennae are very small, hardly to be 

 distinguished, except with a high power of the microscope. 

 Each consists simply of a thickened lump, from which nine 

 setse spring. The inferior antennes are of moderate size ; 

 the arlicLilations rough with short spines irregularly dis- 

 persed over them. The setae are short and thickly plumose. 

 The poslerior angle of the shell terminâtes in a long sharp 

 point closely serrated along both sides ; the serrae extending 

 along Ihe dorsal margin halfway to the head, and along the 

 margins of the valves through a considérable portion of 

 their lenglh. The are larger in the young individuals than 

 in the older. The eye is large. The sixth segment of the 

 body has three projections, one directed upwards supporting 

 the ova. 



)) This species in many respects resembles D. psittacea 

 (Baird). Its greater size, the smallness of the superior 

 antennae and the roundness of head and sharpness of its 

 beak, sufficiently distinguish it from the enghsh species. 



)) The maie is much smaller than the female, and the shell 

 narrower. The superior antennae are large, springing from 

 under the beak, ending in one long stout-jointed seta and 

 several smaller ones. 



» Its habits are no active, consequently it is generally 

 covered wilh vorticellae which much impede its movements. 

 Its never chngs to the stems of weeds, or the side of the 

 vessel in which it is kept, as the next species does. 



wVar.B. Ihaveonly noticed, andthatrarely,intheswamps 

 connected with Bolany Bay. I bave not seen it with ova or 

 ephippia. I bave almost doubted whelher it is not entitled 

 to be regarded as a différent species (c'est la D. Kingii de 

 Schôdler). 



» Var. C. Js remarkable for the number of its eggs. The 

 spécimen figured had between 70 and 80. It was found in a 



