14 
Annals of the Transvaal Museum. 
of the animal. The rump is small, and the foot extremely small, with 
little trace of segmentation. The spurs are of moderate size, acuminate, 
and widely divergent. 
The gullet is very long and makes several loops between the mouth 
and the mastax. The jaws are narrow, triangular, and bear usually four 
teeth in each. The stomach is voluminous and filled with pellets. 
The corona was never seen unfolded, but in the contracted state it can 
be seen to be of the type which prevails in the genus, in which the discs 
are scarcely separated. The two segments of the rostrum are unusually 
distinct, the end one being enlarged like the end joint of the thumb (as 
in Pleuretra humerosa) (20). The two lamellae are never apparent. They 
appear to have coalesced completely into a single large hood, like that of 
Colurus or Metopidia, which arches over the brush of cilia. 
It is rarely advisable to describe a Bdelloid rotifer as a new species if 
it has not been seen with the corona expanded, feeding. Even if it is 
undeniably a distinct species, it must have very pronounced features before 
it can be safely described, and the description must be careful and as com- 
plete as possible. 
In this case the concurrence of a papillose trunk with a definite genera] 
form, and especially the peculiar form of the rostrum and lamellae, seem 
to justify the course taken, as the animal should be recognizable with 
confidence from these characters. There are only a few species of 
Habrotrochi which have the trunk papillose, and there are none known 
in which the lamellae form such a definite single hood. A hood most 
nearly approaching that of H. cucullata is found in Callidina natans (23). 
Two species of the genus are papillose, H. aspera and H. crenata. H. aspera 
has only two teeth in each jaw; H. crenata has a greater number of teeth 
than H. cucullata , a shorter antenna, and there are prominent lateral 
bosses on the rump. 
Habitat. — Pretoria, collected by J. Hewitt, April, 1910 ; fairly 
numerous 
Habrotrocha sp. (Plate III, figs. 19a-!9e). — A small animal, with 
spurs of distinctive form, like those of C. quadricornifera. It is certainly 
a good species, but has not been sufficiently studied. The rostrum is very 
short and broad. The jaw is triangular, with five or six teeth. The foot 
is very short, and the penultimate segment (which bears the spurs) has 
an annular swelling like that of Philodina indica. 
Habitat . — Woodbush ; also known in British East Africa. 
Summary of Results. 
Our list numbers forty species, of which six are described as new 
species, thirty-one others are new records for South Africa, and sixteen 
are new records for Africa. One of the new species ( Callidina bullata) 
had been previously described as a variety of C. Jiabita. 
It seems remarkable, as a first glance, that only three of our forty 
species should be found in Mr. Rousselet’s li ;t. The explanation is that 
all our species were obtained from dry moss, whilst all those in Rousselet’s 
list are aquatic species. The presence of three aquatic species in our list 
