Euchlanidoia.'] infusorial animaicitles. 653 



Genus Lepadella. The scaled Rotatoria are devoid of eyes, but 

 possess a furcate foot. Scvei'al rotatory muscles are seen, and foot 

 ones in two species. The jaws of the oesophageal head are single- 

 toothed in L. ovalis and L. emarginata; in L. saljyina, triple-toothed. 

 The tube of the oesophagus is very short in all. The alimentary 

 canal is constricted, except in L. salpina, in which it is simple. The 

 ovarium is globular in all, and a male sexual vesicle is present in 

 L. salpina, in which siiecies, 'probably, a cerebral ganglion (no eye) 

 also exists. L. ovalis is sometimes developed in myriads in stagnant 

 water. 



Dujardin has the following criticisms on the genus Lcpadella, 

 " Wishing to derive his generic characters too exclusively fi'om the 

 eye specks, Ehrenberg has separated all those ha-sang such specks 

 into several genera ; constituting of those with two eye points, the 

 genera Stephanojjs, and Metopidia, and of those with four red specks, 

 the genus Squamella. But we are convinced that these red points 

 may be present or absent in the same species at different periods of 

 development. We believe, for instance, that the Lepadella ovalis and 

 i)fepha?io2)s muticus, Ehr., are but a single species. Lepadella patella 

 "with or without red dots ; so also the Metopidia lepadella and 

 Squamella hractea are the same, and what we name Lepadella rotaii- 

 data. Moreover, the Squamella ohlonrja, and Metopidia acuminata, 

 are two distinct species of Lepadella.'''' 



L. ovalis (^Brachionus ovalis, M.) — Lorica depressed, oval, at- 

 tenuated anteriorly, the ends trimcated ; it is not emarginate. The 

 alimentaiy canal of this animalcule is generally filled with a yellowish, 

 substance, except when it feeds upon colourless Monads. Fig. 430 

 represents a back view; fig- 431 a side (right) view of a j'oung 

 si^ecimen ; fig. 432 the lorica ; fig. 433 the oesophageal head (l-240th.) 



L. emarginata {Brachionus spatella et ovalis, M.) — Lorica depressed, 

 oval, broad anteriorly, extremities emarginate. Found amongst Con- 

 ferva. Length, without foot, 1-5 76th. 



L. (?) salpina. — Lorica oblong, prismatic, obtusely triangular, back 

 crested, denticulated. Foimd amongst Conferva. Length of lorica 

 l-200th. 



Genus Diplax (Gosse.) — Resembles Salpina, but the eye is wanting, 

 and the lorica (which, as in that genus, is cleft down the back) is 



