GENUS PODOPHRYA. 815 



Podophrya Lyngbyi, Ehr. sp. 



Body globose or pyriform ; tentacles capitate, scattered irregularly over 

 the entire distal extremity ; pedicle thick, two or three times the length of 

 the body ; contractile vesicles two in number ; colour yellowish-brown. 

 Length 1-500". Hab. — Salt water, on marine algae and Sertularics. 



Embryos of this species, as observed by Claparede and Lachmann, are 

 released from the parent body in a form idendcal, except for the absence of a 

 footstalk, with the latter ; or, in other words, they may be said to correspond in this 

 early state with the adult condition of the genus SphcBrophrya. By Ehrenberg this 

 type is figured and described under the title of Acineta Lyngbyi. 



Podophrya Steinii, C. & L. Pl. XLVI. Figs. 58 and 59. 



Body pyriform, tapering posteriorly; tentacles numerous, slender, not 

 conspicuously capitate, distributed irregularly over the entire peripheral 

 surface ; pedicle about equal in length to the body, slender at its base, very 

 widely expanded at its point of junction with the body, finely striate longi- 

 tudinally, and coarsely wrinkled transversely ; contractile vesicles multiple ; 

 endoplast central, radiately branching. Length 1-150". 



Hab. — Fresh water, on Dytiscus marginalis. 



This species was first figured and described by Stein as an Acineta-phase of 

 Opercularia articulata, but was afterwards invested with the above specific title 

 by Claparede and Lachmann. Engelmann has shown that each contractile vesicle 

 in this type possesses a distinct tubular outlet. 



Podophrya cothumata, C. & L. sp. 



Body discoidal, flattened, oval or reniform, pedicle very short and thick, 

 less than one-half the length of the body ; tentacles not fasciculate, forming 

 a crown at the anterior extremity ; contractile vesicles numerous, disposed 

 in a continuous row around the periphery ; endoplast horseshoe-shaped or 

 band-like. Length 1-240". 



Hab. — Fresh water, on various species of Lemna and Callitricha. 



This form is identical with the Acmeta cothumata of Weisse, and the " diadem- 

 artige Acinete" of Stein. In Pritchard's 'Infusoria' it is embodied under the 

 title of A. diademifonnis, but is confounded with the PodopJuya fcrnim-eqiiimim 

 previously described. 



Podophrya conipes, Mereschk. Pl. XLVIIIa. Fig. 4. 



Body subspheroidal or pyriform, soft, plastic, and frequently with 

 irregular prominences and depressions ; tentacles with conspicuous aceta- 

 bulate extremities, not very numerous, produced in young individuals from 

 the anterior region only, but extending in the adult zooids irregularly from 

 all parts of the periphery, slender, and exceeding the length of the body 

 when fully exsert ; pedicle five to eight or ten times longer than the body, 

 narrowest and pointed at its proximal extremity or point of attachment, 

 and gradually increasing in diameter as it approaches its junction with the 



