PLATE V. 



Structure of Sarcodic Bodies of Orhitolites duplex (figs. 1-10), and Orhitolites complanata 



(figs. 11-18). 



Oi'hitolites duplex. 



Fig. 1. — Decalcified body, showing the concentric arrangement of its colunmar sub-segments. 

 Magnified 25 diameters. 



Fig. 2. — One of its separate anuuli, showing at o, a and h', h' the upper and lower series of 

 columnar sub-segments, with expanded summits, issuing from the annular sarcodic cords c, c ; from 

 which also issue the two rows of stolon-processes dd, d'd' that go to form the succeeding annulus. 

 Magnified 60 diameters. 



Fig. 3. — Two of the columnar sub-segments more enlarged, to show the corpusculated character of 

 the sarcodic substance. Magnified 150 diameters. 



Fig. 4. — Thick -walled (parasitic ?) cells, a, h, c, of a deep red colour, lying irregularly in the 

 sarcodic substance of certain specimens. Magnified 200 diameters. 



Fig. 5. — Small sub-segments of central portion, surrounded by chitinous (?) wall. Magnified 150 

 diameters. 



Fig. (J. — Sarcodic body of "nucleus," showing at a the primordial segment, which gives off the largo 

 circumambient segment b, h', a partly-separated portion of wliicli, c, gives off the first incomplete zone 

 of sub-segments, ilagnified 120 diameters. 



Fig. 7. — Section of sarcodic body close to the median plane, showing the sarcodic anuuli c, c, giving 

 off obliquely the narrow bases of the columnar sub-segments. Magnified 50 diameters. 



Fi'.r. 8.- — Lateral view of two sarcodic annuli ec cc', with their columnar sub-se"ments. Magnified 

 64 diameters. 



Fig. 9. — Section of sarcodic body above the median plane, showing an increased diameter of the 

 columnar sub-segments as compared with their narrow bases siiovvn in fig. 7. Magnified 50 diameters. 



Fig. 10. — Surface view of expanded summits of columnar sub-segments. Magnified 50 

 diameters. 



Orhitolites complanata. 



Fig. 11. — Decalcified body of sub-typical specimen, the inner part of which is formed on the 

 " duplex " plan, as shown by the surface-aspect of its sub-segments, while the outer shows the aspect 

 characteristic of the " complex " type. Magnified 25 diameters. 



Fig. 12. — Surface-aspect of sarcodic sub-segments of inner part of sarcodic body, enlarged to 40 

 diameters, sliowing its exact correspondence to that of fig. 1. 



Fig. 13. — Surface-aspect of sarcodic sub-segments of outer part of sarcodic body, occupying the 

 chamberlets of the superficial planes. Magnified 50 diameters. 



Fig. 14.^Portiou of sarcodic body of " complex " type seen in vertical section : — a, h, annular cords 

 of upper series ; h', an annular cord of lower series ; c, <•', sub-segments of upper and lower planes, 

 each connected with two annular canals ; d, d, columnar sub-segments of interposed stratum, 

 communicating with those of next annulus, e, by oblique alternating stolon-processes. Magnified 

 150 diameters. 



Figs. 15 and 17. — Parasitic (?) cells lying irregularly in sarcodic substance. Magnified 130 

 diameters. 



Fig. 16. — Sarcodic substance of annulus and superficial sub-segments, containing spherical 

 corpuscles, closely aggregated together in some parts, separate in others. Magnified 180 diameters. 



Fig. 1 8. — "Nucleus " of typical form, showing at a the primordial segment, which gives off the large 

 circumambient segment h, h,' with its partly detached portion c, round the entire margin of which are 

 given off stolon-processes that give immediate origin to a complete annulus of sub-segments. Magnified 

 84 diameters. 



