eggs or embryos are never found at the same time; the latter, 

 as compared with the parent animal, attain a considerable size 

 and always occur in juxtaposition, with the greater diameter 

 parallel to the longitudinal axis of the shell. 



The colour of the animal is a bright yellow, changing in 

 the dorsal part to a somewhat darker chestnut tint. 



Biological Observations. — I first observed this interesting 

 Lynceid on the 21st July, in the same aquary that yielded the 

 above described remarkable form of Sididae, Latonopsis australis. 

 There were at that time several specimens present, all fully 

 developed and with eggs, or embryos, in their matrix. I fished 

 up some for closer examination and preserving in spirit, hoping 

 that the remaining specimens would multiply and thus yield 

 sufficient material for subsequent observations. But they only 

 survived a very short time, probably owing to a sudden change 

 in the temperature that happened to set in during the follow- 

 ing days. 



As to habits this Lynceid is very active, moving rather 

 rapidly, by sudden jerks, much as does the European form Mo- 

 nella ex'ujua Lilljeborg. The movements are however not con- 

 tinued for any length of time, but the animal very soon again 

 clings with its body to some submerged object, more generally 

 to the inner walls of the aquary. When any way disturbed, it 

 will however at once change its place and so rapidly that to 

 catch it with the dipping tube proved a matter of very con- 

 siderable difficulty. 



Occurrence. — As stated above, this form was raised from 

 the same parcel of clayey mud, that yielded two of the above 

 described Cladocera, Latonopsis australis and Simoaph'il^ ^ h: "' 

 Mfoe (Water Hole at Cattle Station), though observed in only 

 one of the aquaries prepared with this material. — Mr. King 

 met with the species at Dunheved, the South Creek, and also a 

 Varraville, near Denham Court. 



