Mr. F. M'Coy on Palaozoic Corals and Foraminifera, 119 



EXPLANATION OF PLATE VII. 



Fig. I. ah cd, four figures of fibrillae after Muys. 



— 2. "A fibre covered with cellular membrane at the upper part," cross- 



striated and splitting up into fibrillae at one end : after Fontana. 



— 3. Diagram of fibrillae after Bowman, 



— 4. Diagram to illustrate the views of Sharpey, Lealand and Carpenter: 



a, two fibrils united ; 6, single fibril, with each sarcal particle ha- 

 ving a dark central and clear outer part. 

 •^ 5. Diagram of two fibrillae to illustrate the views of Mr. Erasmus Wil- 

 son : a, usual appearance of fibrillae ; 6, a very much stretched 

 fibril to show the dark and clear spaces, each divided into four. 



— 6. Diagram to show the fibrillae in the distinct and superficial focus : 



a, fibrils in distinct focus ; by fibrils in superficial focus from the 

 frog. 



— 7. Diagram of two fibrils from the lobster: a, fresh fibril much 



stretched, showing scalloped edges of clear space ; h, similar fibril 

 unstretched, showing clear space apparently dark from its nar- 

 rowness. 



— 8. Diagram to illustrate a membrane observed among the fibrillae : 



a, membrane as seen in frog and salmon ; h, similar membrane 

 observed among fibrillae 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 species of Palaozoic Corals and 

 Foraminifera. By Frederick M^Coy, M.G.S. & N.H.S.D. &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 outer 

 area on each side composed of 

 smaller and more curved vesi- 

 cular plates, in rows inclining 

 obliquely upwards and out- 

 wards : horizontal section dis- 

 playing the central flat axis 

 surrounded by radiating la- «• Mode of growth and division of 

 mellse extending from the walls, ^tem ; 6 horizontal section; 



1 i 1 • .1 , c. vertical section, 



and connected m the outer area 



by numerous transverse vesicular plates : additional columns 



