Dr. G. C. Wallich on the Coccosphere. 349 



seen it Incidentally stated tliat " nuclei " had been observed 

 in (rromia by Max Schultze. On turning to Dr. Carpenter's 

 * Introd. Study Foram.' pi. iv. fig. 13, I found, as I expected, 

 the figure of a highly magnified view of a mass of sarcode, 

 containing two spherical granular masses, the explanatory 

 description being as follows : — " Nuclear bodies ? [sic] imbed- 

 ded in the sarcode of Oromia. After Schultze." Not having 

 Schultze's work to refer to, it is out of my power to say 

 whether these bodies represent true nuclei or merely sarcohlasts. 

 But be this as it may, if the credit of the di.scovery of a 

 micleus in Gromia be due to Schultze, most cheerfully do T 

 cede it to that distinguished observer. 



EXPLANATION OF PLATE XVIL 



Fig. L Coccosphfpra pelayicn (Wall.), ^vith its complemeut oi cocculiths. 



Fig. 2. Cell- wjxll of same, showing distinct membranous outline ; mostol" 

 the coccoliths having been thrown off. 



Fig. 3. Coccosphtern Carterii (Wall.). 



Fig. 4. The same in the (fehiscimt (?) condition. 



Fig. 5. Coccolith of C. pelayica seen from external aspect ; showing the 

 radiate striation on margin of outer disk, and the central depres- 

 sion which constitutes the " central clear space " of Iluxlev. 



Fig. 6. Coccolith oi C. Carterii; side view, showing the <m7o central de- 



Sressious and radiate marginal striae, together with the inner 

 isk and intermediate piece. 



Fig. 7. The same, as seen from its external aspect, this being, in short, a 

 front view of the outer disk. Here also the two button-hole-like 

 depressions are shown. 



Fig. 8. Circular coccolith of C. pelayica occasionally met with. 



Fig. 8 a. A specimen of a form of coccolith occasionally but rarely occur- 

 ring, in which there is no central depression, but apparently an 

 aperture close to the margin of the outer disk. 



Fig. 9 D. Diagrammatic, enlarged, side view of coccolith of C. pelagiea. 



Fig. 10 D. Diagrammatic vertical section of same, showing the central 

 depression (a), in external disk : s, the stem ; e d, the inner disk. 



Fig. 11 D. Diagrammatic front view of the outer disk of same : a, the 

 central depression, the *' central clear space " of Huxlev, and 

 " nucleus " of other writers ; b, the innermost ring, indicating 

 the margin of this depression ; c, the ring indicating the outline 

 of the intermediate piece, or stem uniting the two disks ; d, the 

 ring indicating the margin of the inner disk ; <?, the outline of 

 the outer disk itself. Possibly these are the rings referred to in 

 Prof. Huxley's Report of 1808, when describing the coccolUhs 

 as " curious rounded bodies, to all appearance consisting of 

 several concentric layers surrounding a minute clear centre." 



Fig. 12 S. This figure is copied from fig. 20, plate 10, appended to Prof. 

 Oscar Schmidt's paper '* On Coccoliths and Rhabdoliths " 

 Annals & Mag. Nat. Hist. Nov. 1872, translated by W. S. Dallas, 

 F.L.S. It is described in the text (p. 307) as " a decided 

 coccolith with a dorsal shield, as may be ascertained by placing 

 it on its edge, the dark non-granular part, h, representing tne gra- 

 nular zone, and the clear spaces in it ; a, divided medulhr ifjmce 

 trithout central qmnuU^." 



