ANIMAL KINGDOM. [ 51 ] 



Subkingdom VII. PROTOZO'A. 

 Class I. LMFUSOK/IA. 



Class II. RHIZOP'ODA. 

 Order 1. RETICULA'RIA. 

 Gromia, Foraminifera. 

 Order 2. RADIOLA'RIA. 



Actinophrysy Acanthometra ; Polycys- 



tina. 



Order 3. LOBO'SA. 

 Amaha, Arcella. 

 Order 4. GREGABI'NLDA. 



Class III. SPONGIDA. 

 MONEBA. 



ANNUAL RINGS. 



BIBL. Rymer Jones, An. Kingd.; Todd's 

 Cycl. of Anat. ; Siebold and Stannius, Lehrb. 

 d. vergl Anat. ; D'Orbigny, Diet. d'Hist. 

 Ned. ; V. d. Hoeven, Handb. d. Zool. ; Owen, 

 Hunt, Lect. ; Carpenter, Compar. Physiol. ; 

 Cuvier's An. Kingd., by Blyth, Mudie, 

 Johnston, Carpenter, and Westwood ; Vogt, 

 Zool. Itriefe ; Gosse, Mar. Zool. ; Carus, Ic. 

 Zoot. (Invertebrata) ; Blanchard, Regne 

 Animal ; Leydig, Lehr. d. Hist. ; Baird, 

 Nat. Hist., 1863; Green, Cceknterata, 1863; 

 Van Beneden, Anat. Comp. ; Strieker, Gew. 

 d. Memch. u. Thiere, 1872 ; Hackel, Gen. 

 Morph. ; Chenu, Encycl. d'Hist. Nat. (8000 

 figs.), 1866; Thome, Zool., 1875; Hayek, 

 Zool, 1877 ; Bronn^'e Klass.d. Thiei-reichs, 

 1880; Clans, Grundzuye d. Zool, 1875; 

 Schmidt, Handb. d. vergl Anat., 1876; 

 Schmarda, Zool, 1878; Nicholson, Man. 

 Zool, 1878; Gegenbaur, Vergl Anat., 1878 ; 

 Huxley, Inv. $ Vert., 1872 ; R. Lankester, 

 Qu. M. Jn. 1877, xvii. p. 399 ; Pascoe, Zool 

 Class., 1880; M'Alpine, Zool, 1881. 



ANISONE'MA, Duj. A genus of Infu- 

 soria, belonging to the family Tliecaniona- 

 dina (Flagellata, Kent). 



Char. Body colourless, oblong, more or 

 less depressed, covered with a resisting 

 tegument, from an aperture in which two 

 filaments emanate one flagelliform and 

 directed forwards; the other thicker, trail- 

 ing and retracting the body of the animal ; 

 movement slow. 2 species : 



A. acinus (grande). Movement directly 

 forwards, colourless; length 1-1280 to 

 1-810" ; fr. wat. among Conferva. 



A. sulvata (PI. 23. f. 12). Movement 

 vacillating in a circle ; colourless ; fr. wat. ; 

 length 1-1100". 



3 other species. Dujardiu suggests that 

 the Bodo gmndis of Ehrenberg is referable 



to one of these species, as also to the genus 

 Heteromita, Duj. 



BIBL. Dujardin, Infos, p. 345 ; Kent, Inf. 

 p. 434. 



ANKISTRODESMUS, Corda (Rapid- 

 dium, Rabenh.). A genus of Desinidiacege. 



Char. Cells elongated, attenuated, entire, 

 aggregated into faggot-like bundles. 



The cells only differ from those of Closte- 

 rium in their Aggregation. Species : 



A.falcatus, Corda (Rhaphidium fascicu- 

 laturn, Kiitz.). Cells numerous, crescent- 

 shaped: aquatic; length 1-549", breadth 

 1-7353"; common. (PI. 14. fig. 47.) 



A. fusiformis, Corda. I n , , , 



A.conmlutm, Corda. f Carlsbad - 



BIBL. RaKs, Brit. Desmidiece, pp. 179 

 and 222 ; Corda, Alman. d. Carlsbad, 1835, 

 p. 121, 1838, p. 199. 



ANNUAL RINGS. The concentric 

 lines seen in transverse sections of Dicoty- 



Fig. 21. 



Cross section of a Dicotyledonous stem with annual 

 ringa. 



ledonous stems (fig. 21) generally indicate 

 successive annual additions to the woody 

 structure, and in these cases depend on the 



Fig. 22. 



Magnified cross section of stem of Finns, exhibiting 

 parts of three annual rings, 1, 2, 3. 



difference of the character or condition of 

 the tissues produced at different seasons. 



E2 



