The foraminifera: an introduction to the study of the protozoa . LAGENA ORBULINA rvninpi voni? Nodosaria marginulina HELICOSTEGA ENTOMOSTEGA ENALLOSTEGA AGATHISTEGA. CRISTELLARIA DISCORBINA BULIMINA TEXTULARIA SPIROLOCULINA Fig. 26.—DOrbigxys Classification of the Foraminifera, ILLUSTRATED BY SELECTED TyPES. 2. Cyclostega.—Body discoidal, composed of con-centric lines of segments, simple or multiple, neverspiral. Examples: , ([/jcIocI/j/)e/ts. 3. Stichostega. — Body composed of segmentsdisposed in a single line. Shell consisting of a linearseries of chambers. Straight, as in Xodosm
The foraminifera: an introduction to the study of the protozoa . LAGENA ORBULINA rvninpi voni? Nodosaria marginulina HELICOSTEGA ENTOMOSTEGA ENALLOSTEGA AGATHISTEGA. CRISTELLARIA DISCORBINA BULIMINA TEXTULARIA SPIROLOCULINA Fig. 26.—DOrbigxys Classification of the Foraminifera, ILLUSTRATED BY SELECTED TyPES. 2. Cyclostega.—Body discoidal, composed of con-centric lines of segments, simple or multiple, neverspiral. Examples: , ([/jcIocI/j/)e/ts. 3. Stichostega. — Body composed of segmentsdisposed in a single line. Shell consisting of a linearseries of chambers. Straight, as in Xodosm-ia ; curved,as in Marginulina. Conrs Elcinenfaire dePaleoutologic ct de Geologic StratigrapJiiqtie,vol. ii. p. 189. Paris, 1852. PLANS OF GROWTH 47 4. Helicostega.—Body consisting of a spiral seriesof segments. Shell made up of a number of convolu-tions. The spiral may be either nautiloid (flat), as inCristeUaria, or turbinoid (conical), as in Discorhina. 5. Entomostega.—Body consisting of alternatesegments spirally arranged : shell chambers disposedon two alternating axes forming a spiral. Example :Biilini/iKi. (}. Enallostega. — Body composed o
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