50 THE liOTIFERA. 



Ptiouodina keflexa, Gosse (lU'J), (PI. XXXI. fig. 54). 



[SP. CH. Lorica elliptical in outline, the two longitudinal halves bent upicanl 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 uinoard, 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), jiy inch. Habitat. Smallheath, Birmingham. P.H.G.] 



Bbachionus beevispinus, Ehrenberg (42), (PI. XXXIV. fig. 17). 



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

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



This Rotiferon closely resembles B. Bakeri, from wliich 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, -^^ inch. Habitat. Near Berlin (Ehr.). 



Brachionus polyceeus, Schmarda (135), (PI. XXXIV. fig. 13). 



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

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



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

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

 inwards ; the middle pair very much so. 



Length (of lorica), cir. -jj;, inch. Habitat. Kingston, Jamaica (Schmarda). 



Brachionus ancylognathus, Schmarda (135), (PI. XXXIV. fig. 14). 



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

 margin undulated, ivith two lateral spines ; four posterior spines, the tivo 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, , J,, inch. Habitat. Stagnant water near Quito (Schmarda). 



Brachionus inermis, Schmarda (134), (PI. XXXIV. fig. 18). 



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

 or behind. 



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

 Length, ^1,, inch. Habitat. Nile overflow, Monfalut (Schmarda). 



Brachionus latissimus, Schmarda (134), (PI. XXXIV. fig. 15). 



SP. CH. loriua, very broad, rough ; six unequal occiTpital s]^mes, none bcJiind. 



The figure of this Egyptian Bracltionus, 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 shape. The posterior corners are 

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



