4 



G. O. SARS. 



[No. 1. 



that year prevented me from commencing my experiments before 

 the last days of May, when at length the temperature of the 

 air had risen to 15 C. At that time, and subsequently, I 

 carefully prepared a number of aquaries of different size for the 

 reception of parcels of mud from the several localities; and 

 having already acquired some practise from my earlier experi- 

 ments, I felt pretty sure of getting some new Entomostraca 

 hatched from the mud in the course of the summer. In fact, 

 the results of my experiments have been on the whole very 

 satisfactory, a considerable number of interesting forms, belong- 

 ing to different orders, viz., Branchiopoda, Ostracoda, Copepoda, 

 and Polyzoa, having been successfully hatched and in most 

 cases studied throughout several successive generations. Of all 

 the forms, I have prepared carefully made camera lucida drawings, 

 coloured from life, and in some cases also figures elucidating the 

 anatomical structure and embryology, it being my intention to 

 publish subsequently full descriptions of all the species. Among 

 the several forms domesticated in my aquaries, there are also 

 two Phyllopoda, the one apparently a species of the Branchipodid 

 genus Streptoceplwhis Baird, the other belonging to another group, 

 viz., the Con ch osfr a ca, or bivalve Phyllopoda. The latter of these 

 two forms would seem to exhibit quite a special interest, having 

 proved the representative of a very distinct new generic type, 

 and, besides, beiug highly distinguished by its peculiar mode of 

 propagation. I therefore determined at once to institute a more 

 detailed investigation of this remarkable form, and to publish 

 in the first instance a separate account of the said Phyllopod. 

 The other Phyllopod, as also the Cladocera, Ostracoda, Copepoda, 

 and Polyzoa, I purpose describing in one or two forthcoming 

 papers, to be published as soon as possible. 



As to the Phyllopod forming the object of the present paper, it 

 has by no means escaped the attention of other naturalists, having 

 been described as early as in the year 1859, by the late Dr. W. 

 Baird, from specimens collected by the Rev. S. Hi sl op at 

 Xagpur, India; and quite recently the same form has also been record- 

 ed from Ceylon, by Dr. G. S. Brady. But, as none of these authors 



