388 DESCRIPTION OF [Rotatoria. 



latter (the under ones) hooked, the dorsal crest bifid 

 and gaping ; it has four teeth to each jaw. Found amongst 

 conferva. Length 1 -200th. 



669. SALPINA brevispina. The short-horn edSalpina. 

 Lorica scabrous, horns two (small) in front, and three be- 

 hind, short dorsal crest not gaping; lorica milky and 

 turbid, but appearing bright ; respiratory tube unknown. 

 Found amongst Ceratophyllum. Length l-144th. 



670. SALPINA bicarinata. The double-combed Salpina. 

 Lorica smooth, horns four in front, three posterior, short ; 

 neither lateral muscles nor respiratory tubes known. 

 Length 1-2 16th. 



Genus CLXXI.I. DINOCHARIS. The goblet Rotatoria 

 are provided with a single cervical eye, a furcated foot, and 

 a lorica closed below, and unarmed at both ends. The 

 compound rotatory organ has five or six muscles, and the 

 foot two in two species. An cesophagal head with single- 

 toothed jaws is found, except in D. tetractis, which Dr. E. 

 thinks has four teeth ; ossophagus very short, alimentary 

 canal constricted, except in D. pocillum (gast erode Id}, which 

 is constricted: tw r o oval glands exist in D. pocillum and 

 tetractis. Glandular portions of ovarium are seen in all, 

 and a contractile vesicle at the base of the foot in D. po- 

 cillum . Traces of a vascular system are perhaps to be seen 

 in D. pocillum, though even here it is doubtful, for the 

 apparent tremulous organ just behind the ossophagus may 

 be only a tremulous condition of an internal fold of the 

 stomach. The only evidences of a nervous system are the 

 eye and the long ganglion which supports it. 



671. DINOCHARIS pocillum (Trichoda pocillum, M.) 

 The Jive-poinled Dinocharis. Lorica nearly cylindrical ; 



