12 Transactions of the Socictu. 



The separation of the two is so slight that the apparent motion of 

 tlic cilia seems to pass uninterrupted round both. The lower lip 

 is not prominent or spout-like. The mouth is large, occupying 

 the whole length of the elongated head. The lamellse are small, 

 and seem distinct. The antenna has a strong sigmoid curvature, 

 and shows a prominence at the back near the base. The second 

 neck-segment shows a projecting rim at its anterior edge. The 

 trunk is somewhat swollen, and diminishes posteriorly to what may 

 be supposed to be the foot, but no details of anus, spurs or toes have 

 been seen. The case is pale yellow, broadly triangular, and broadest 

 near the base. The jaws are triangular and bear two teeth each. 



Habrotrocha ampulla is a close relative of H. angusticollis, for 

 which I mistook it for some years. It has the same general form, 

 the same number of teeth, and a similar case. The greater breadth 

 of the case is the first noticeable difference, and as it almost always 

 contains an egg, it might be supposed if H. angusticollis secreted a 

 case to protect itself and the egg it would take this form. Careful 

 attention brings out other differences, of which the chief are the 

 elongated head, the less prominent lower lip, and the longer antenna. 

 The head lacks the ridges which are seen in H. angusticollis. 



It is not necessary to compare H. ampulla carefully with any 

 other species. Very few pellet-makers have only two teeth in the 

 jaw. H. aspera is papillose all over the trunk ; Ceratotrocha corni- 

 gera has been made the type of a new genus because of the posses- 

 sion of finger-like feelers at the sides of the head. H. longiceps, 

 also a flask-maker and with similar elongated head, has more teeth 

 and is not so slender. 



Habitat. — Central Africa (N. D. F. Pearce) ; Pretoria, collected 

 by J. Hewitt, April 1910. Mr. W. Milne, of Uitenhage, sent me 

 a drawing which I believe to have been of this species, which I then 

 considered as a form of H. angusticollis. 



Habrotrocha perforata Murray (15). 

 Synonym: Ccdlidina perforata. 



Apparently characteristic of warm countries, though it has been 

 found in some temperate regions (Switzerland, New Zealand). It 

 is now known to possess spurs — which are small, blunt, and widely 

 separated — and a " tail " like that of Habrotrocha caudata. The 

 " tail " of H. perforata is much shorter and the neck much wider. 



Habrotrocha longiceps Murray {17). 

 Synonym : Callidina longiceps. 



Very common in warm countries, though originally discovered 

 in Scotland. It is often detected by the presence of the peculiar 

 cases, when the animal itself is not seen. In African examples the 

 teeth were generally six or seven in each jaw. 



