198 Mr. P. H. Gosse on the British Rotifera, 



sionsthierchen ' ; five have been described since, and thirty-two 

 are new. 



Family Ichthydina. 



Cheetonotus maximm. 

 C. squamatus (Dujardin). 



C. larus. 



Gen. Dasydytes. (Saaix;, hairy, and Svt7)<;, a diver.) Eyes 

 absent ; body furnished with bristle -hke hair ; tail simple, trun- 

 cate. 



D. goniathrix. Hairs long, each hair bent with an abrupt 

 angle : neck constricted. Length y^^th inch. Leamington. 



D. antenniger. Hair short, downy ; a pencil of long hairs at 

 each angle of the posterior extremity of the body : head fur- 

 nished with two club-shaped organs resembling antennae. Length 

 -j-T-pth inch. 



Gen. Sacculus. One eye, frontal; body destitute of hair, 

 and without a foot : rotatory organ a simple wreath ; alimentary 

 canal very large : jaws set far forward, apparently consisting of 

 two delicate, unequal mallei, and a slender incus ; very evanes- 

 cent : eggs attached behind, after deposition. 



S. viridis. Body pear-shaped -, flattened ventrally ; the ante- 

 rior end the narrower : head conical, pointed, surrounded by a 

 wreath of long cilia : digestive canal occupying nearly the whole 

 body, and always filled with a substance of a rich green hue, in 

 masses. Length yjyth inch. This curious animal, found in 

 considerable number in a little pool on Hampstead Heath, must 

 be placed in this family according to Prof. Ehrenberg's system, 

 but the mode of carrying its eggs indicates an affinity with the 

 Brachionaa. 



Family (Ecistina. 



(Ecistes crystallinus. 



Conochilus volvox (?) . 



Family MEeALOTROcHiEA. 



Megalotrocha velata. Animals separate : disk partially enve- 

 loped in a cleft granular integument : eggs not attached to the 

 parent after deposition. Length jjth inch. 



Family Floscularia. 

 Stephanoceros Eichhornii. 

 Limnias ceratophylli. 

 Melicerta ring ens. 



Floscularia complanata (Dobie, Ann. Nat. Hist. 1849). 

 F. ornata (?). The 5-lobed variety; or species ? 

 F. cornuta (Dobie). 



