50 JAMES MURRAY 



Callidina habita, Bryce (4) Variety (Plate XL, Figs. 8a-8e) 



Description. Large, stout, hyaline or yellowish, much widest in central trunk, 

 which is plicate with broad folds. Length when feeding, up to 570 M, diameter of 

 trunk 125 M and upwards, of corona 95 /u- The corona is much wider than the collar, 

 and that is much wider than the neck. The discs are large and bear central setae. 

 They are separated by a space equal to half the diameter of the disc. The collar is 

 prominent and appears two-lobed in dorsal view. It is continued on to the upper 

 lip as two large rounded lobes which meet in the middle line. 



The rostrum is stout, and the lamellae appear to be quite separated. The 

 antenna is equal to one-third the diameter of the neck. The jaws are large and 

 have a thickened border, sometimes coloured brown. The teeth are two in each jaw, 

 witha thinner one. 



The voluminous stomach is of a deep crimson colour, and the walls are filled with 

 larger and smaller globules. The yolk-mass contains eight nuclei. The two 

 segments of the rump are obscurely distinguishable. The foot is four-jointed, but 

 there is often difficulty in making out more than three. The spurs are stout, almost 

 cylindrical, quickly tapering to the acute points, divergent. The first foot-joint has 

 a thickening forming a more or less distinct boss. 



The egg is elliptical and is produced at each pole into a rounded prominence 

 (Fig. 8d). 



This variety, which is typical in every other respect, differs conspicuously in" the 

 form of the spurs. Those of the type are broad and very acuminate, the lower edge 

 making an ogee curve. The highly coloured stomach is an important feature, but it 

 cannot be considered of much specific value. 



Another variety. Rather smaller, the two lobes of the upper lip less distinct, 

 separated only by a small notch. Spurs in form like the type, but smaller, and the 

 curvature of the lower edge less marked. The foot-boss more distinct. Otherwise 

 like the type (Plate XL, Fig. 86). 



Both forms were fairly common in most of the lakes at Cape Royds. They did 

 not occur in Green Lake. In Blue Lake at a depth of fifteen feet. 



Fa m ily ADINET AD^E 

 'Genus Adineta 



The genus Adineta, the only one yet described in the family, is a small one. It 

 contains at present some eight recognised species. It is better represented in the 

 Antarctic Region than any of the other genera of Bdelloids. 



Five species were recognised, of which one (A. grandis) is new to science. 



