32 Proceedings of the Royal Society of Victoria. 



two large cement glands or receptacles. Male : without mastax 

 and alimentary system ; two eyes ; dorsal antenna ; ciliated cup 

 ventrally near posterior. 



Dimensions. — Colony, 5 mm. diameter. Peduncle, 10 to 12 

 mm. long. Adult female, 2'6 mm. long; corona, "18 mm. 

 wide. Young female, "35 mm. long. Male, -17 mm. long. 

 Resting egg, -145 mm. x "097 mm. 



Habitat. — Brighton, Caulfield. Lagoons along the valley of 

 the Yarra. 



Lacinulapia pedunculata. 



I have only met with two colonies of this species. These 

 remarks and figures are given so that this species may be 

 definitely identified, and in order to make clear the specific 

 differences between it and the form previously dealt with. As 

 in L. striolata there is a spherical colony of rotifers attached to a 

 long slender peduncle. The smaller of the two colonies was evi- 

 dently more developed as the individuals, twenty-two in number, 

 were Iflrger, and ova were numerous. The females composing 

 the colony were about 1 mm. in length (Figs. 24, 25); the corona 

 heart shaped, and three times the width of the body ; the plane 

 of the disc being inclined until nearly parallel to the axis of the 

 body. The dorsal gap is absent. The trochus and cingulum ai-e 

 separated by a wide groove, narrowing at the doisal portion of 

 the corona. Two obvious ventral antennae occur, and there are 

 two eyes placed about half-way down the corona and close to the 

 trochus. The mouth has two ridges running forward on either 

 side, which have the power of coming together and thus close the 

 mouth. A yellowish mass above the mastax is very conspicuous. 

 The body for some distance below the neck is ridged trans- 

 versely and tapers away to a long narrow foot. In general 

 outline it resembles L. socialis much more than Z. striolata. 

 The internal atanomy presents no features obviously differing 

 from the usual type of the genus. There seems to be no doubt as 

 to the distinctness of this form from the one previously described 

 as L. striolata. The much greater width of the corona, and the 

 different arrangement of the trochus and cingulum as well as the 

 peculiar contractility of the mouth mark it off distinctly. Mr. 



