50 THE ROTIFERA. 



PTERODINA EEFLEXA, Gosse (169), (PL XXXI. fig. 54). 



[SP. CH. Lorica elliptical in outline, the two longitudinal halves bent upivard and 

 backward, at a considerable angle ; the dorsal surface being evenly furrowed, the ventral 

 rounded. 



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. reflexa 

 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. 



Length (of lorica), 75^0 inch. Habitat. Smallheath, Birmingham. P.H.G.] 



BRACHIONUS BEEVISPINUS, Ehrenberg (42), (PL XXXIV. fig. 17). 



SP. CH. Lorica smooth, with six sharp unequal occipital spines, and four stout 

 posterior spines, of which the middle pair is the shorter. 



This Rotiferon closely resembles B. Bakeri, from which it differs mainly in the 

 smoothness of its lorica, the length and shape of the spines (all very variable charac- 

 teristics), and the form of its gastric glands ; each of the latter of which consists of two 

 oval lobes. 



Length, g^ inch. Habitat. Near Berlin (Elir.). 



BRACHIONUS POLYCEBUS, Schmarda (135), (PL XXXIV. fig. 13). 



SP. CH. Lorica broad, nearly six-sided; eight occipital spines, the outmost pair 

 rough ; four posterior spines, the outer pair very long, the inner pair short. 



The lorica is flat and yellowish, and its pair of occipital spines, which are next to the 

 outmost, cross these latter very curiously. Both the pairs of posterior spines curve 

 inwards ; the middle pair very much so. 



Length (of lorica), cir. T J ^ inch. Habitat. Kingston, Jamaica (Schmarda). 



BKACHIONUS ANCYLOGNATHUS, Schmarda (135), (PL XXXIV. fig. 14). 



SP. CH. Lorica broad, narroived in front ; occipital spines six ; the pectoral 

 margin undulated, with two lateral spines ; four posterior spines, the two outer the 

 longer. 



Schmarda describes the shape of the lorica (which will be best understood from the 

 figure), and adds that the corona is reddish, and three-lobed ; the eye transversely 

 oval. 



Length, T ^ inch. Habitat. Stagnant water near Quito (Schmarda). 



BRACHIONUS. INERMIS, Schmarda (134), (PL XXXIV. fig. 18). 



SP. CH. Lorica smooth, anterior margin slightly concave; no spines either in front 

 w behind. 



From a slight sketch of a solitary specimen found in Egypt. 

 Length, v ' w inch. Habitat. Nile overflow, Monfalut (Schmarda). 



BRACHIONUS LATISSIMUS, Schmarda (134), (PL XXXIV. fig. 15). 



bP. CH. Lorica very broad, rough ; six unequal occipital spines, none behind. 



^The figure of this Egyptian Brachionus, as given by Schmarda, is very striking. The 



lorica, which is rough and of unusual breadth, is widest behind, and gradually narrows 



to the anterior margin, so that it has a trapezoidal si: ape. The posterior corners are 



rounded off, and the foot-opening is a shallow concavity. The anterior margin is scol- 



