. The Cambridge natural history. Zoology. 78 PROTOZOA B. ACANTHARIA. Order vii. Actineltda. — Radial spines numerous, more than 20, usually grouped irregularly. (Families 33-35.) Xiphacantha Haeok. Order "viii. Acanthonida.—Radial spines equal. (Families 36-38.) Order ix. Sphaerophracta. — Radial spines 20, with a latticed spherical shell, independent of, or formed from the reticulations of the spines. (Families 39-41.) Dorataspis Haeck. (Fig. 25, A). Order x. Prunophracta,—Radial spines 20, unequal; latticed shell, ellipsoidal, lenticular, or doubly conical. (Families 42-44.). Fig. 24.—X
. The Cambridge natural history. Zoology. 78 PROTOZOA B. ACANTHARIA. Order vii. Actineltda. — Radial spines numerous, more than 20, usually grouped irregularly. (Families 33-35.) Xiphacantha Haeok. Order "viii. Acanthonida.—Radial spines equal. (Families 36-38.) Order ix. Sphaerophracta. — Radial spines 20, with a latticed spherical shell, independent of, or formed from the reticulations of the spines. (Families 39-41.) Dorataspis Haeck. (Fig. 25, A). Order x. Prunophracta,—Radial spines 20, unequal; latticed shell, ellipsoidal, lenticular, or doubly conical. (Families 42-44.). Fig. 24.—Xiplmcantim (Acantliaria). From the surface. The skeleton only, x 100. (From Wyville Thomson.) C. Nassellaria. Order xi. Nassoidea.—Skeleton absent. (Family 45.) Order xii. Plectoidba.—Skeleton of a single branching spicule, the branches sometimes reticulate, bvit never forming a latticed shell or a sagittal ring. (Families 46-47.) Order xiii. Stephoidea.—Skeleton with a sagittal ring continuous with the branched spicule, and sometimes other rings or branches. (Families 48-51.) Lithocercus Theel (Fig. 26, A). Order xiv. Spyroidea.—Skeleton with a latticed shell developed around the sagittal ring (cephalis), and constricted in the sagittal plane, with a lower chamber (thorax) sometimes added. (Families 52-55.). Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original Harmer, S. F. (Sidney Frederic), Sir, 1862- ed; Shipley, A. E. (Arthur Everett), Sir, 1861-1927. ed. [London, Macmillan and Co. , Limited; New York, The Macmillan Company
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Keywords: ., bookcentury1800, bookdecade1890, booksubjectzoology, bookyear1895
