. The Annals and magazine of natural history; zoology, botany, and geology. Natural history; Zoology; Botany; Geology. Mr. F. M'Coy on Palaozoic Corals and Foraminifera. 119 EXPLANATION OF PLATE VII. Fig. 1. abed, four figures of fibrilljE after Muys. — 2. "A fibre covered with cellular membrane at the upper part," cross- striated and splitting up into fibrillse at one end : after Fontana. — 3. Diagram of fibrillse after Bowman. — 4. Diagram to illustrate the views of Sharpey, Lealand and Carpenter: a, two fibrils united; b, single fibril, with each sarcal particle ha- ving a dark ce
. The Annals and magazine of natural history; zoology, botany, and geology. Natural history; Zoology; Botany; Geology. Mr. F. M'Coy on Palaozoic Corals and Foraminifera. 119 EXPLANATION OF PLATE VII. Fig. 1. abed, four figures of fibrilljE after Muys. — 2. "A fibre covered with cellular membrane at the upper part," cross- striated and splitting up into fibrillse at one end : after Fontana. — 3. Diagram of fibrillse after Bowman. — 4. Diagram to illustrate the views of Sharpey, Lealand and Carpenter: a, two fibrils united; b, single fibril, with each sarcal particle ha- ving a dark central and clear outer part. — 5. Diagram of two fibrillce to illustrate the views of Mr. Erasmus Wil- son : a, usual appearance of fibrillse ; b, a very much stretched fibril to show the dark and clear spaces, each divided into four. — 6. Diagram to show the fibrillse in the distinct and superficial focus : a, fibrils in distinct focus ; b, fibrils in superficial focus from the frog. — 7. Diagram of two fibrils from the lobster: a, fresh fibril mucli stretched, showing scalloped edges of clear space ; b, similar fibril unstretched, showing clear space apparently dark from its nar- rowness. — 8. Diagram to illustrate a membrane observed among the fibrillse : a, membrane as seen in frog and salmon; b, similar membrane observed among fibrillce of the muscle of skate, perfectly fresh. — 9. General appearance of a dissection of muscular fibre from the frog, magnified about 500 diameters. XIII.— On some new genera and sjjecies of Palaozoic Corals and Foraminifera. By Frederick M'Coy, & &c. [Continued from p. 20.] Stylaxis (M'Coy), n. g. Gen. Char. Corallum composed of adjacent polygonal, prismatic, easily separable tubes, inter- nally divided into three areas : vertical section, 1st, a thin, flat, straight axis; 2nd, a broad in- ner area composed of nume- rous curved vesicular plates in irregular rows converging up- wards to the axis; 3rd, an
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