GEXUS PUDOPHRYA. 819 



Hab. — Fresh water, associated with Epistylis brancJiiophila, .on the larva; 

 of Phryganidse. 



In accordance with his original views concerning the nature and affinities of 

 the Acinetidae, this type was originally accepted by Stein as a developmental form 

 of theVorticellan Epistylis branchiophila, upon whose pedicle it occurs as a parasite. 

 In the first volume of his 'Organismus' it receives from him the title of ^c/V/cA? 

 phryganidarum, but the entire absence of any trace of a lorica or distinct pellicular 

 investment necessitates its relegation to the genus FoJophiya ; the slender pointed, 

 non-capitate tentacles of this species, in addition to the shorter flexuose pedicle, 

 serve to distinguish it from F. pynim or any other of its more near allies. 



Podophrya infusionum, Stein sp. 



Body subspheroidal or pyriform, attached • by its more attenuate 

 posterior extremity to a short sinuous pedicle, whose length rarely exceeds 

 one-half that of the body ; tentacles short, distinctly capitate, developed 

 in two lateral fascicles ; contractile vesicles two in number ; endoplast 

 elongate-ovate, subcentral. Length of body I-350". 



Hab. — Pond water and infusions. 



This species was originally figured by Stein* as an elongate variety only of 

 Podophrya fixa, but has an independent position awarded to it under the dtle 

 of Adtieta infusionum in the first volume of his more recent treatise.t It may be 

 readily distinguished from the Podophrya named, in addition to the more elongate 

 contour of the body, by the flvsciculate instead of the distributed disposition of the 

 tentacles. 



Podophrya astaci, C. & L. Pl. XLVI. Figs. 14-17. 



Body elongate, subquadrate, scarcely twice as long as broad ; tentacles 

 forming two groups at the anterior and posterior extremities ; pedicle thick, 

 transversely wrinkled, gradually enlarging from its point of attachment to 

 that of its junction with the animalcule's body ; contractile vesicles numerous, 

 irregularly distributed ; endoplast oval, central. Length 1-300". 



Hab. — Fresh water, on the river crayfish {Astacus fliiviatilis). 



This species is figured and described by Stein under the name of " Acinde des 

 Fbisskrebscs." From Podopluya elongata, which it somewhat resembles, it may be 

 distinguished by the absence of the two median lateral fascicles of suckers and by the 

 tapering or conical contour of the pedicle. 



Podophrya pyrum, C. & L. 



Body pyriform, attenuated posteriorly, the rounded and inflated 

 anterior extremity bearing one apical and two lateral fascicles of 

 capitate tentacles ; pedicle from one to one and a half times the length of 

 the body ; contractile vesicles two in number, one near the anterior and 

 the other adjacent to the posterior extremity ; colour brown, opaque ; 

 endoplast oval, subcentral. Length of body 1-150". 



Hab. — Fresh water, on Lemna trisidca. 



* 'Die Infusionsthiere auf ihre Entwickelungsgeschichte,' 1854. 

 t ' Der Organismus der Infusionsthiere,' torn. i. p. 48, 1859. 



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