Euplota.'] INFUSORIAL ANIMALCULES. 603 



with long styles radiating from each extremity. In river 

 water. 



Ploesconia longiremis. — Body very depressed, irregularly oval, 

 dilated on the side supporting the cilia, where it is more transparent, 

 with 3 — 4 large ribs, but slightly prominent ; cirrhi numerous, very 

 long and flexible. Length l-400th to l-30Gth. In sea water. 



P. aculeata = Euplotes aculeatus (Ehr.) 



Genus Diophrys. — Body discoid, irregular, thick ; concave on 

 one side, convex on the other; with long cirrhi grouped at each end, 

 no mouth. 



D. marina. — Body oval, with a longitudinal excavation ; terminated 

 in front by 5 gi-eat vibratile cilia, and behind by 4 — 5 very long 

 geniculate cirrhi. Length l-580th. In sea water. (Fig. 22 ah, 

 P. 21.) 



Genus Coccudina. — Body oval, depressed, or nearly discoid, often 

 rather sinuous on the margin ; convex, pitted or granular, and 

 glabrous above ; concave below, with vibratile cilia and cirrhi or 

 hooks, serving as feet: without mouth. 



Intermediate between Loxodes and Ploesconia, having the ap- 

 pendages of the latter, and the general figure of the former. 

 Ehrenberg has left the Coccudina known to him dispersed among 

 Oxytricha and Euplotes. 



C. costata. — Body oval, obliquely contracted, and sinuous in 

 front; convex and furrowed beneath, where from 5 — 6 very promi- 

 nent tubercular ribs are found, processes grouped at each end ; 

 the anterior thinner and vibratile. Length l-965th. In marsh 

 water. 



C. crassa. — Body oval; larger, and seemingly truncated behind; 

 contracted and sinuous in front ; convex above, with feebly marked 

 ribs ; anterior processes in the form of hooks ; posterior, of straight 

 styles. Length l-20th. Marine among corallines. 



Q,. polypoda. — Body oval, sinuous in front; convex, and marked 

 above with from 7—8 narrow ribs; flat below, and furnished with 

 numerous long and flexible cirrhi. In stagnant sea water. (Fig. 

 30«5e, P. 21.) 



C. cicada. — Body oval, granular, very convex, margin rounded; 

 concave beneath, and there provided with long and flexible cirrhi. 



