OF THE PKOTOZOA. 



547 



Epipyxis Utriculus (xxii. 42). — Small, 

 conical, and pitcher-like, filled wdth yel- 

 lowish granules ; attached by a pedicle. 



The figure represents a gToup of several 

 attached to a portion of Conferva. 

 1-640". 



Genus DINOBRYOIS' (XXII. 48-49).— Distinguished from the preceding 

 genus by possessing an eye-speck and freedom of motion. The lorica also is 

 larger and looser around the body of the creature. Reproduction takes place 

 by gemmae, which do not separate from the parent ; hence a shmbby, forked, 

 and polype-like cluster is produced. 



DiNOBRYON Sertularia (xxn. 48, 49). 

 — Lorica (sheath) large, slightly excised 

 and dilated at the mouth, but constricted 

 above the base or the attached extremity. 

 This animalcule is readily overlooked, l3y 

 reason of its crystalline lorica, and often 

 nearly colourless body ; by a patient in- 

 vestigation, however, the little colony 

 may be perceived rolling along, and ad- 

 vancing in the field of view. Within 

 each lorica a pale-yeUow animalcule may 

 be noticed, in foi-m somewhat resembling 

 the young of CJilorogotiimn or of Euc/lena 

 viridis. The creature is able to contract 

 itself into a rounded mass at the bottom 

 of its case, or it extends itself to the 

 mouth of the lorica, but not beyond it. 

 A red speck occurs at the anterior part 

 of the body, fi'om which a single thread- 

 like filament is protruded beyond the 

 sheath. The vibrating filaments of the 

 several members of the colony propel it 

 through the water like so many pacldles. 

 In bog-water. Length of animalcule 



1-570", cluster 1-120". Stein in the 

 course of his researches met with a spe- 

 cimen of Dinohnjon Sertularia which he 

 likens to a Eugleniform being, living m 

 a crystalline goblet-like sheath, much 

 like that of Vaginicola crystallina or of 

 Cothiirnia imherhis. The sheaths grouped 

 on a stem are only mechanically united 

 together, and are under no circumstances 

 developed by progressive gemmation from 

 the hindmost one, asEhrenberg supposed. 

 Each being has a clear, homogeneous, 

 discoid nucleus near its base, containing a 

 central nucleolus. 



D. (P) soeiale. — Small, enveloped in a 

 shell of a simply conical shape, truncated 

 at the mouth. Developed in the fomi of 

 a shrub-like poh-parv. In fresh water. 

 1-860", cluster 1-280". 



D. gracile. — Less branching (fruti- 

 cose), lorica slightly constricted at the 

 middle, aperture truncated. Animalcule 

 1-2080". 



OF THE GROUP PROTOZOA (p. 199). 



In the an-angement pui'sued in the first part of this work the Protozoa follow 

 the Phytozoa, and are primarily di\-ided into two chief subsections, viz. — 

 Rhizopoda and CiHata. These we shaU treat as two groups of Infusoria, 

 divisible into a few subgroups, and, commencing with the Rhizopoda, shall 

 treat systematically, fii'st those beings properly called so, and afterwards, as 

 subgroups, the Actinophrj^na and the Acinetina. The Ciliata and their divi- 

 sions will follow next. 



GROUP TI.— RHIZOPODA (p. 201). 



(Plates XXI.-XXIII.) 



This term and its synonym Pseudopoda are derived from the leading charac- 

 teristic of the class, viz. the variable processes or false feet which serve as their 

 locomotive organs. The former appellation is more in vogue, but its extent 



2^2 



