86 D. BRYCE ON FIVE NEW SPECIES OF BDELLOID ROTIFERA. 



with obvious food pellets. The first foot segment has a median 

 dorsal prominence of moderate height, rather wider than long, 

 and best seen in lateral view. The second segment has the very- 

 characteristic spurs, which always suggest to me the caudal 

 processes of the common form of Chaetonotus. They are longer 

 than is customary among pellet-making species, frequently 

 measuring 14 to 15 /x in length, but are sometimes much shorter. 

 Near the base they are swollen on the inner side, and closely 

 approximate. About mid-length they suddenly diminish in 

 thickness and are thence produced to rather acute points. The 

 outer side of each is nearly straight, and they are held at a 

 slightly divergent angle. The three toes are difficult to see, but 

 the terminal pair (and I think the dorsal toe" as well) are 

 moderately long and acute. The dorsal antenna is sometimes 

 quite 25 fx long and is carried much as in Rotifer macroceros t 

 being inclined backwards when the animal is creeping about, and 

 directed more or less forward when it is feeding. 



The corona attains a width of about 45 li. The trochal discs 

 are separated by a shallow furrow, which narrows to a mere 

 notch as it nears the ventral side. On that side accordingly the 

 principal wreath is almost uninterrupted, and in place of the 

 customary appearance in front view of two distinct " wheels '' 

 there is rather that of a toothed band passing rapidly round a. 

 single transversely elliptic course, distinctly broken on the dorsal 

 side and only slightly indented on the ventral. In lateral view 

 it is seen that the pedicels are dorsally inclined, short and 

 obliquely truncate, so that the trochal discs are still more inclined 

 towards the dorsal side. The under lip and mouth margins are 

 high in relation to the discs, and the former centrally prominent 

 and spout-like as in Habrotrocha angusticollis, but in a lesser 

 degree. The upper lip is usually hidden by the reverted rostrum. 

 So far as I have been able to discern, it rises moderately towards 

 the centre and is neither bilobed nor reflexed. The rami are 

 about 19 fx in length, somewhat triangular in outline, and have 

 each at least seven very fine teeth. 



