Ophryocer cilia.'] INFUSORIAL ANIMALCULES. 5<S1 



The auimalciilc assumed as the type of this genus, is the Loxodcs 

 rostrum of Ehi-enbcrg. It is stated to differ from the Paramecicns l)y 

 the absence of a contractile integument. 



Pelecida rostrum. (Duj.) = Loxodes rostrum (Ehr.) 



Famili- OPHEYOCEECINA. 



The animalcules of this small family have no lorica ; they possess 

 an alimentary canal, with two distinct orifices, the anal one only 

 being terminal. Although their motion is rapid, vibratile organs are 

 only perceived near the mouth, but their long neck assists them in 

 swimming, and indeed is sufficient alone for that purpose. Perhaps, 

 remarks Ehrenberg, the body is covered with delicate cilia. Ova 

 granules are seen in all the species, and a contractile vesicle in T. hiceps. 

 Neither self-division nor a development in clusters has been observed. 



Genus Tracheloceeca. Stvan-Uke animalcules. 



T. olor {Vibrio proteus, cygnus, et olor, M. Lacrymaria olor, D.) — 

 Body spindle-shaped ; neck simple, very long and flexible, dilated 

 and ciliated at the mouth. This creature (figs. 317, 318, 319,) 

 creeps at the bottom of the vessel containing it, and twines itself 

 gracefully about Conferva, or the roots of Lemna, but swims awk- 

 wardly. It elongates and contracts its neck at pleasure, and is 

 altogether an interesting object for the microscope. Greatest length, 

 l-36th; length of body, l-280th. 



T. viridis {Lacrymaria viridis, D.) — Body spindle-shaped, neck 

 simple, very mobile, long, and dilated at the mouth, which has a 

 ciliated Kp. Found amongst Lemna. Length l-120th; contracted, 

 l-380th. 



T. hiceps. The double-headed TricJielocerca. — Body spindle-shaped, 

 white; neck long, forked, each segment with a mouth. Length, 

 1-1 90th. 



T. sagitta= Vibrio sagitta, M. — Body fusiform, white, with a very 

 long neck; head terminal, opaq^ue. Size 1-1 20th. North and 

 Baltic Seas. 



