16 THE VOYAGE OF H.M.S. CHALLENGEE, 



These bodies sometimes lie in the centre of the swollen joint in the calcareous substance 

 {cf. the longitudinal section, fig. 6), or near the integument (fig. 5), or even embedded 

 in the latter as it was the case in the walled pit of fig. 2, a. In sections, one always 

 finds that this egg-like body is surrounded by a non-calcified tissue (m), uniformly 

 stained by carmine. When the body lies close below the integument (fig. 5) the tissue 

 is connected with the latter. 



The sections shed no light upon the nature of the contained body. In fig. 5, 

 which represents a body with a diameter of 0*26 mm., the more darkly stained cortical 

 substance appears in part roughly divided, and in the central mass also there are fine 

 Lines which suggest a similar division ; when the contents are compressed they fall into 

 clumps like yolk segments. ■ 



In fig. 6 the smaller swelling («) contains a single body with a diameter of 0-058 mm., 

 in which no structure could be detected, and the distinction between cortical and central 

 mass was less obvious. On the other hand, in the three bodies (Jj, c d), which are con- 

 tained in the larger sweUiag of the same puinule, and which measure from O'l to 0-12 mm. 

 in diameter, the structure described in fig. 4 is already indicated. That these 

 structures are not ova seems to me to foUow from the fact that none of the stained 

 preparations exhibited any trace of nuclei. 



Furthur investigation is therefore necessary in order to elucidate the nature of the 

 cyst contents. 



