384 DESCRIPTION OF [Rotatwia. 



658. MASTIGOCEBCA carinata (Trichoda rattus, M.) 

 The flesh-coloured Mastigocerca. Lorica anteriorly crested 

 on the back ; foot the same length as body ; it swims 

 slowly, and resembles Monocerca rattus. Figs. 438, 

 439, are side views, showing the delicate ridge of the lorica 

 projecting on the back, andj^g. 440 a dorsal view. Found 

 amongst Ceratophyllum. Length 1-7 2nd. 



Genus CLXX. EUCHLANIS. The mantle Rotatoria 

 have a single cervical eye, a furcated foot, and the lorica 

 longitudinally gaping upon the ventral surface. Com- 

 pound vibratile muscles, with their cilii, compose the 

 rotatory organ: the other muscles are those for moving 

 the foot, for manducation, and fibrous longitudinal ones, 

 the latter presenting transverse corrugations. An oeso- 

 phagal head, with one or many-toothed jaw T s (perhaps 

 four jaws in E. macrura), (gymnogomphia) ; a very short 

 oesophagus, an alimentary canal (simple in five species, 

 constricted in one), having two glands, compose the nutri- 

 tive apparatus ; an ovarium is observed in five species, and 

 two small glands, with a contractile vesicle, in two of the 

 larger species. As parts of a vascular system, two species 

 have perhaps transverse vessels, and in the larger forms 

 tremulous gills are observed, attached to the sexual glands ; 

 a respiratory tube is seen in E. lynceus only. As organs 

 of sensation, all the species have a red coloured cervical 

 eye, which, in five species, is connected with a large 

 ganglion. They do not carry about their eggs externally, 

 nor are they developed in large numbers. 



659. EUCHLANIS (?) triquetra. The three-edged Eu- 

 Manis. Lorica very large, trilateral from a dorsal crest, 

 foot setae none. This species is very diaphanous, and 



