SOME NEW LOCAL ROTIFERS. 
125 
6. Diaschiza (?) cup ha. Much compressed; dorsum squarely 
gibbous: foot short, scarcely protruding; toes long, blade¬ 
shaped, slightly recurved, with claws abruptly shouldered. 
Length in. Lacustrine. 
This hunch-backed form needs fuller examination. I 
describe it from a single example, just dead, but not 
decomposed, in water sent from Birmingham. The depth, 
compared with the width, of the animal is remarkable. The 
troplii were very long, but ill-defined: in the occiput is a 
short brain, carrying a flat, lens-shaped red eye on its inner 
surface. The peculiar shape of the toes is shown at e. I 
affix a mark of doubt to the generic position, because I could 
not be quite sure of the dorsal cleft. (Fig. 6. # ) 
8. Pterodina refiexa. Lorica elliptical in outline, the two 
longitudinal halves bent upward and backward, at a con¬ 
siderable angle ; the dorsal surface being evenly furrowed, 
the ventral rounded. Length of lorica i n * Lacustrine. 
The angular character is not noticed on a dorsal view, 
but becomes conspicuous in the act of turning. P. valvata 
bends its leaves downward, on hinges, at will. P. refiexa 
bends its halves upward, on a medial line which is not hinged, 
but permanent. It is somewhat like a butterfly, sitting, with 
half-opened wings, on a flower in an autumn noon. The 
internal structure is normal. I have found it abundant in 
water from Smallheath, Birmingham. (Fig. 8.) 
12. Notholca polygona. Lorica roundly pear-shaped, trun¬ 
cate in front; the central pair of the occipital spines stout, 
the other two pairs almost obsolete : ventral plate forming a 
square box, with sloping, many-angled sides. Length T oT> i n * 
Lacustrine. 
A remarkable form. The dorsal plate is a half-oval, the 
ventral nearly flat. The latter is very peculiar: a kind of 
sub-cubic box, open at the summit, runs down to about three- 
fourths’ length, and then proceeds, in pyramidal form, to a 
point at bottom ; and this appears to contain the viscera. 
Each side is covered-in by a plate of two planes, but appears 
to be emoty. On those parts of the arched dorsal plate 
which answer to these empty lateral chambers, run down 
very delicate flutings, while the broad medial part is quite 
clear and smooth. All the angles are distinct. The only 
example seen was dead, but showed a crimson eye and a 
normal mastax. From Kmgswood Pool, near Birmingham. 
(Fig. 12.) 
* Reference to figures in J.R.M.S., Feb., 1887, PI. I. and II. 
