ANIMAL KINGDOM. 



L 51 ] 



ANNUAL RINGS. 



Subkingdom VII. Pbotozo'a. 

 Class I. Infcsob'ia. 



Class II. Rhizop'oda. 

 Order 1. Reticula'ria. 

 Gromia, Foramiuifera. 

 Order 2. Radiola'ria. 



Ac/inop/iri/s, Acanthonietra ] Po/i/ci/s- 

 tina. 

 Order 3. Lobo'sa. 

 Amahtt, ArceUa. 

 Order 4. Ctregari'nida. 



Class III. Spongida. 



MONEEA. 



BiBL. Rvmer Jones, ^n. Kitifjd.; Todd's 

 Ctfd. ofAnaf. ; Siebold and Staniiius, Lehrb. 

 d. rergl. Anaf. ; D'Orbigny, Did. cVHist. 

 Kat. ; V. d. lloeveu, Ilundb. d. Zool. ; Owen, 

 Hunt. Led. ; Carpenter, Compar. Physiol. ; 

 CuAier's An. Kiwjd., by Blyth, Mudie, 

 JohriStoii, Carpenter, and Westwood; Vogt, 

 Zool. Briefe ; Gosse, Mar. Zool. ; Caru?, Ic. 

 Zvof. {Inverfehrata) ; Blancbard, licyne 

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

 Nat. Hist., 1863; Green, Cfefew/era^'ff, 18G3; 

 Van Beneden, Anat. Cvmp. ; Strieker, Geiv. 

 d. Mensch. u. Thieve, 1872 ; Hackel, Gen. 

 Morph. ; Cheuu, Bncyd. d'Hist. Nat. (8000 

 %s.), 18(36; Thome, Zool, 1875; Hayek, 

 ZooL, 1877 ; 'Uxown, Die Klass.d. ThierreicJis, 

 1880; Clans, Grundziuje d. Zool, 187o ; 

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

 Sc'hmarda, Z)ol, 1878 ; Nicholson, Man. 

 ZjoI, 1878; Gegenbanr, VerylAnat., 1878 ; 

 HiLxley, Liv. Sc 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 Thecamona- 

 dina (Flageliata, Kent). 



Char. Body colourless, oblong, move or 

 less depressed, covered 'wdth a resisting 

 tegument, from an aperture in which t^wo 

 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 ((jrunde). Movement directly 

 forwards, colourless; length 1-1280 to 

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



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

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

 length I-llOO". 



3 other species. Piijardin suggests that 

 the Bodo grandis of Ehrenberg is refeiable 



to one of these species, as also to the genus 

 Hefrroiiiifa, Duj. 



BiBL. Dujardin, I/ifns. p. 345 ; Kent, Inf. 

 p. 434. 



ANKISTRODESMUS, Curda (liaphi- 

 diuin, Rabenh.). — A genus of Desmidiaceae. 



Char. Cells elongated, attenuated, entire, 

 aggregated into faggot-hke bundles. 



The ceUs only ditFer from tliose of Closte- 

 riuin in their aggregation. Species :— 



A.falcatus, Corda {^Rhaphidium fascicu- 

 latum, Kiitz.). Cells numerous, crescent- 

 shaped : aquatic ; length 1-549", breadth 

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



A. fimformis, Corda. I /-i i i i 

 A • 1 t r\ ^ ) Carlsbad. 



A. convolutus, Corda. | 



BiBL. Ralfs, Brit. Desmidieee, 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- 



Fiff. 21. 



Cross section of a Dicotyledonous stem with annual 

 rings. 



ledonous stems (tig. 21) generally indicate 

 successive annual additions to the woody 

 structure; and in these cases depend on the 



Fig. 22. 



Magnified croai 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 difl'erent seasons. 



e2 



