822 ORDER TENTACULIFERA-SUCTORIA. 



resemblance to the Podophrya pyrum of Claparede and Lachmann ; the three fasci- 

 culi of suckers serve however to distinguish that species from the present one. 



Podophrya Buckei, S. K. 



Body elongate, slender, subcylindrical, bearing two antero-lateral fascicles 

 of distinctly capitate tentacles ; not possessing a distinct pedicle but affixed 

 basally by a simple contracted sucking-disk ; contractile vesicle anteriorly 

 located ; endoplast subcentral. Dimensions unrecorded. 



HAB. Fresh water. 



This species, which has recently been briefly described by E. Bucke, * without 

 any accompanying title, must be accepted as a new species, apparently most closely 

 resembling Podophrya eylindrica and P. elongata in the contour of its body, but 

 differing distinctly from either of these types in the character of its basal supporting 

 element and in the disposition of its tentacles. With reference to the acetabuliform 

 modification of its basal region it will be probably found desirable hereafter to make 

 this species the type of a new genus. 



GENUS VI. HEMIOPHRYA, S. K. 

 (Greek, hemi, half; ophrys, eyebrow.) 



Animalcules stalked, illoricate, bearing tentacles of two orders, the one 

 series being suctorial, as with the ordinary Acinetidae, the others simply 

 prehensile ; multiplying chiefly by exogenous terminal gemmation ; the 

 endoplast usually more or less irregularly branched. Inhabiting salt water. 



This genus is instituted by the author for the reception of the Podophrya gemmi- 

 para of Hertwig, a form which differs conspicuously from the typical members of the 

 genus Podophrya in the dimorphic character of the tentaculate appendages, which 

 are differentiated for the two separate functions of prehension and food-ingestion. 

 With reference to the presence of supplementary tentacula having a simply pre- 

 hensile function, it forms an interesting and important link between the two groups 

 of the Suctoria and Actinaria, as recognized in this treatise. Two additional species 

 recently described by M. Fraipont, one by M. Koch, and two by E. Maupas, have 

 to be added to the single form upon which the genus was first established. Maupas, 

 the most recent investigator of this group of organisms, has, in his recent very 

 important memoir,t fully recognized the desirability of creating a new generic name 

 for Hertwig's type, and, although having previously selected an independent one, 

 has courteously substituted for it the title proposed by the author, though necessarily 

 without any diagnostic details, in the earlier pages of this work (see pp. 66, 97, 

 and 215). It may be further mentioned here, however, that the new generic name 

 of Hemiophrya, with a figure and brief description of the peculiarities of this species, 

 were included by the author in a paper entitled " Notes on Marine Infusoria," 

 communicated to the meeting of the Birmingham Natural History Society, held on 

 January 2oth, 1880, such paper, with illustrations, being published both in the ' Mid- 

 land Naturalist ' for March and in the Society's Transactions for that year. As rightly 

 indicated by Maupas, Hemiophrya differs from Podophrya in several important 

 details, irrespective of those furnished by the character of the tentacles. 



In this connection, attention may be more especially directed to the phenomena 

 of reproduction, which in all of the several known species takes the form of 

 external or exogenously produced buds or gemmules in place of by endogenous 



* " Die Acineten im Aquarium," ' Der Zoologische Garten,' Jahrgang xv., 1875. 

 t "Contributions a 1'Etude des Acinetiens," 'Archives de Zoologie Experimentale,' torn. ix. 

 No. III. November 1881. 



