5 1 2 ORDER HOL TRIG HA . 



less curved ; oral aperture ventral, remote from the apical extremity, of 

 oblong shape, followed by a short, tubular pharynx ; cuticular surface entirely 

 ciliate ; a fascicle of longer and stouter cilia issuing from the oral cleft ; 

 endoplast and contractile vesicle conspicuous. 



According to Colin, excepting for the absence of the minute enclosed oral mem- 

 brane, the representatives of this genus closely correspond with those of Trichoda as 

 modified by Stein ; the chief distinction between the two being that, while in Trichoda 

 the oral cilia form a small wreath round the subterminal buccal aperture, in Anophrys 

 they depend in a fascicular manner from this structure. The still closer affinity of 

 the type-form of this generic group with Colpoda is self-evident. 



Anophrys sarcophaga, Cohn. Pl. XXVII. Figs. i6 and 17. 



Body elongate-ovate or clavate, subcylindrical, rounded posteriorly, 

 pointed and curved anteriorly, from three to four times as long as broad ; 

 pale amber colour ; oral aperture situated on the ventral surface at a distance 

 of one-third of the length of the entire body from the anterior extremity, 

 bearing a fascicle of about eight or nine large cilia ; cuticular surface 

 furrowed longitudinally and transversely ; the cilia clothing the pointed 

 anterior extremity of larger size than those of the remaining portion of the 

 body, which are very fine and difficult to see ; endoplast central, spherical, 

 of large size ; contractile vesicle postero-terminal. Length 1-400". 



Hab. — Salt water, with decaying animal matter. 



As recognized by Cohn,* this species, excepting for the character of the oral cilia, 

 closely resembles the TricJioda {Leucophrys) caniium of Ehrenberg, a species occur- 

 ring in putrescent infusions, and in water from manure-heaps ; the oral aperture in 

 this latter type would seem, however, to be more nearly terminal. Reference is 

 made by Cohn to a long tail-like seta at the posterior extremity, but is not indicated 

 in his drawings. The fascicle of oral cilia in rapid motion is described as present- 

 ing the appearance of an undulating membrane. 



Genus V. COLPODA, Ehrenberg. 



Animalcules free-swimming, persistent in shape, ovate or reniform, 

 compressed ; oral aperture ventral, lying in a cleft-like depression at some 

 little distance from the anterior extremity, having no undulating membrane, 

 but giving origin to a brush-like tuft of longer cilia ; pharynx absent or 

 rudimentary ; cilia of the general surface very fine, sometimes conspicuous 

 only towards the anterior extremity of the body. Lihabiting fresh and 

 salt water and infusions. 



Colpoda GucuUus, Ehr. Pl. XXVII. Figs. 19-23. 



Body subreniform, one and a half times as long as broad, rounded and 

 inflated posteriorly, pointed anteriorly and recurved towards the ventral 

 aspect ; cilia of the oral region projecting in a tongue-shaped or tuft-like 

 manner from the oral fossa, the shorter cilia of the general surface con- 

 spicuous only towards the anterior extremity of the body; endoplast 



* 'Zeitschrift fiir Wissenschaftliche Zoologie,' Bd. xvi., 1866. 



