8l6 ORDER TENTACULIFERA-SUCTORIA. 



body, finely striate transversely throughout its length, and usually bearing 

 two conspicuous central annuli ; contractile vesicle single, subcentral ; endo- 

 plast elongate-ovate. Length of body 1-240" to 1-144". 



HAB. Salt water : White sea (Mereschkovvsky), on Rhodospermous 

 Algae (Ptilota and Ceramiuni), at various depths. 



This characteristic form which, excepting for its tapering and transversely striate 

 pedicle, most nearly approaches P. Lyngbyi, is regarded by Mereschkowsky, in 

 common with Tintinnus Ussowi, as belonging essentially to the Arctic zoological zone. 



Podophrya limbata, Maupas. PL. XLVIII. FIG. 5. 



Body subspherical, with a usually more attenuate posterior prolongation, 

 the periphery frequently surrounded by an evenly developed, tenacious, 

 hyaline, gelatinous film ; tentacles slender, irregularly distributed, distinctly 

 capitate, from ten to fifteen in number, their length when extended equal to 

 about one and a half times the diameter of the body ; pedicle transparent, 

 rectilinear and even throughout the greater portion of its length, but ex- 

 panding abruptly at the distal extremity to four or five times its normal 

 width, and thus forming a platform of support to the animalcule's body ; 

 parenchyma yellow or colourless ; contractile vesicle single, laterally located ; 

 endoplast ovate, subcentral. Length 1-850". HAB. Salt water. 



This species is reported by Maupas* as occurring on Hydroid zoophytes both at 

 Roscoff, Brittany, and in the neighbourhood of Algiers. Its discoverer proposes 

 to identify the frequently developed peripheral gelatinous film with the external 

 gelatinous layer that surrounds the denser body-mass or so-called " central capsule " 

 of the typical Radiolaria. This external film in Podopkrya libera was observed to 

 be of exceedingly tenacious consistence, readily entangling foreign particles held 

 suspended in the surrounding water, and thus when gathered from a turbid source 

 was so opaque as to preclude a distinct view of the body proper. Possibly this 

 secretion of a mucilaginous investment may be a preliminary step towards the process 

 of encystment. 



Podophrya infundibulifera, Hartog. 



Body subspherical or pyriform, mounted on a short rigid pedicle ; 

 tentacles varying from six to fourteen in number, distributed throughout 

 the peripheral surface ; when at rest, short, thick, with obtusely rounded 

 distal terminations, and a circular constriction a little below the joint ; 

 when extended in quest of food dilated funnelwise in this region, and 

 exhibiting throughout their length equidistant circular wrinkles. Con- 

 tractile vesicle single, contracting at intervals of 34" to 44''. Endoplast 

 spherical. Dimensions unrecorded. 



HAB. Fresh water, on Cyclops gigas, especially females, on and about 

 the bases of the oral appendages. 



This species is briefly described by Mr. Marcus Hartog in the 'Proceedings of 

 the Manchester Literary and Philosophical Society,' vol. xix., 1880. It is distin- 

 guished from Podophrya eyclopum by the scattered plan of distribution of the 

 tentacles and by the non-capitate aspect they ordinarily exhibit. 



* "Contribution k I'Etude des Acinetiens," 'Arch, de Zool. Exp.,' torn, ix., 1881. 



