630 



STSTEilATIC HISTOEY OF THE IJ^^FUSOETA. 



Harmodirus Ovum. — The proboscis 

 is not so much a process of the substance 

 of the body, as like a jointed finger or 

 segment ; it has a jerking movement in 

 one direction, yet it appears frequently 

 stretched as a stiff process from one side. 

 Cilia extremely tine; thirty rows have 

 been counted on one side ; they are most 

 evident near the proboscis. Diastrophy 



may be frequently witnessed. 1-180" to 

 1-36". In fi-esh and bog water, with 

 Lemnse. This species is doubtless the 

 same as Traclielius Ovum (Ehr.) and Am- 

 phUeptus Ovum (Duj.) ; and we do not 

 conceive the necessity of elevating it to 

 the rank of a genus on account of the 

 slight differential character of the pro- 

 boscis, as Perty has done. 



Genus CINETOCHILUM (Perty) (XXYIII. 35).— Small, short, elliptical, 

 somewhat compressed ; vibratile flap on the posterior half. 



CixETOCHiLUM margaritacenm= CycUcUum margaritaceum (Ehr.) (see p. 573). 



Genus CYCXOGPAMMA (Perty) (XXVIII. 36, 37).— Body small, ha^ing 

 the form of Paramecium ; with concentric striae on the margin, and a lateral 

 depression near the fore part, where a mouth, with an obsciu'e but peculiar 

 apparatus of from four to seven bristles, is apparent. It is a member of a 

 family called Decteria (see j). 624). 



Cyclogramma ruhens. — Colom* yel- 

 low, seldom green, or reddish-white. 

 Mostly rather compressed ; rarely sub- 

 cylindrical. Cilia very tine, with the 

 exception of those on the margin, which 



i are arranged in circular rows. Move- 

 ment commonly sluggish. The dental 

 apparatus is evident in some examples, 

 but undiscoverable in others. 1-480" to 

 1-300". Ponds, Bern. 



FAMILY YIII.— OPHRYOCERCIXA. 



Polygastria without lorica ; alimentary canal with two distinct orifices, of 

 w^hich only the anal one is terminal. Although their motion is rapid, ciha 

 are perceived near the mouth only, though they probably cover the body ; 

 the long neck assists in swimming, and indeed is sufficient alone. Granules 

 (ova?) are seen in all the species, and a contractile vesicle in T. biceps. 

 Self-division probable, but not observed. 



No such family as Opluyocercina enters into the system of Dujardin, the 

 animalcules composing it being all referred to the genus Lacvymaria (see 

 p. 609) ; and consequently that oi Traclielocerca is merged in the same. 



On the other hand, Perty retains this family name, but, unlike Ehrenberg, 

 comprehends in it both TracJielocerca and Lacrymaria : moreover he assigns 

 to Trachelocerca a ^vider generic signification, so that it includes also Phialimi 

 (Ehr.). Again, this family is the representative of one of his three chief 

 sections of Ciliata, viz. Metabolica, thus defined : — " Animalcules very con- 

 tractile, undergoing protean changes of figiu-e by the expansions and con- 

 tractions of the body. Cilia scarcely visible upon the body, but clearly seen 

 on its neck-like process." Laehmann describes the oesoj^hagus in this family 

 to be collapsed, or invisible, except during the passage of food. 



Genus TRACHELOCEECA.— Characters as above. 



Trachelocerca 0/or(T7&noP;-ofe?^s, I the vessel containing it, and twines 



Cygmis et Ohr, M. ; Lacrymaria Olor, 

 D.) (XXIV. 317, 318, 319).— Spindle- 

 shaped ; neck very long and flexible, 

 terminated by a dilated and ciliated 

 mouth. The surface is beautifidly reti- 

 culate in this and the following species. 

 This creature creeps at the bottom of 



itself gracefully about Confervae, or the 

 roots of Lemnse, but swims awkwardly. 

 It elongates and contracts its neck at 

 pleasure, and is altogether an interesting 

 object for the microscope. Greatest 

 length 1-36". It has been found en- 

 cvsted. 



