866 THE ANIMAL KINGDOM. 



Z. W. Z. xxxvi. 1882, p. 700. Urospora of Ciona intestinalis, Parona, Journal de 

 Micrographie, x. 1886: U. (Monocystis) Sipunculi, Ray Lankester, Q. J. M. xii. 

 1872. Conorhynchus Echiuri, Greeff, 'Die Echiuren,' p. 128, Nova Acta, 41, 1879. 

 Haematozoal forms, note i, p. 859 ante. 



Amyloid granules, Maupas, C. R. 102, 1886 ; Butschli, Zeitschrift fiir Biologic, 

 xxi. 1885. 



Development of Polycystids. Clepsidrina Blattarum, Butschli, Z. W. Z. xxxv. 

 1881. Stylorhynchus longicollis, Schneider, A. Z. Expt. x. 1882, p. 423; (2), ii. 

 1884; of various forms, Id. Tablettes Zoologiques (supra), pp. 10, 81 ; cf. p. 104. 



(ii) Amoebosporidia : Ophryocystis, Schneider, A. Z. Expt. (2), ii. 1884, cf. 

 A. N. H. (5), xiv. 1884; Id. Tablettes Zoologiques (supra}, p. i. 



(iii) Sarcosporidia : Blanchard, Bull. Soc. Zool. France, x. 1885; Leuckart, op. 

 cit. supra, p. 199. 



(iv) Myxosporidia : Butschli, ' Fischpsorospermien,' Z. W. Z. xxxv. 1881 ; 

 Me*gnin, ' Role pathologique,' &c., Bull. Soc. Zool. France, x. 1885. 



RHIZOPODA. 



PROTOZOA in which the organism is provided with pseudopodia as 

 organs of locomotion and ingestion of food, or for the latter purpose alone. 

 Contour of the body, whether provided with an envelope or test or not, 

 either stable or amoeboid. The pseudopodia are sometimes very stable, 

 usually changeable, always retractile. The first stage of the life-history, 

 or the fission-product is sometimes flagellate. 



There are six classes, the Heliozoa, Radiolaria, Foraminifera, Amoe- 

 bina, Mycetozoa, and Labyrinthulidea, and a group, Proteomyxa, including 

 an assemblage of forms which cannot at present be located elsewhere. 



CLASS HELIOZOA. 



Rhizopod Protozoa with radiant and stable pseudopodia, seldom branched 

 or anastomosing, and a globular body of unchanging outline; rarely fixed. 

 The protoplasm is very generally divided into an ectosarc and an endosarc, 

 not delimited by a membrane ; the organism is uni- or multi-nucleate ; 

 vacuoles both contractile and non-contractile are commonly present. A skeleton 

 is sometimes absent ; when present it is gelatinous, or siliceous, and then 

 either composed of loose spicules, plates, &c., or of a contimious lattice-shell. 

 An adventitious skeleton is rare. Biflagellate spores have been observed in 

 some instances. Widely distributed ; freshivater and marine. 



A skeleton is absent in one section of the class, the Aphrothoraca. 

 When present it is either gelatinous (?) or siliceous, rarely adventitious. 

 As to the first-named, it occurs in the Chlamydophora, and takes the form 

 of a soft more or less mobile envelope, homogeneous, granular or striated ; 



