46 



Mr. E. A. Minchin. Note on tJie Lama and the 



Ffa. 3. Longitudinal section of larva. 



ciliated cells proper, and their nuclei are larger and paler with one 

 or two nucleoli. The nucleus of the first intermediate cell frequently 

 presents a curious appearance, being swollen out into a large vesicular 

 structure containing two or three chromatin masses. This condition 

 is apparently in connexion both with a process of rearrangement of 

 the chromatin and with the absorption of the vacuoles. The granular 

 cells are arranged in a single layer, and have large pale nuclei with 

 nucleoli. Often the nucleus of the cell nearest the intermediate cells 

 has a pointed outer end, evidently indicating the former connexion 

 with the flagellum. 



Sections reveal a remarkable set of structures in connexion with 

 the central pigment, which is now seen to have the form of a tube, 

 open in front and behind, and enclosing a rounded, lens-like body, 

 apparently a gelatinous mass filling the central cavity, the remnant, 

 doubtless, of the segmentation cavity. Behind these bodies are a 

 number of cells with coarse granules and small, very opaque, deeply 

 staining nuclei.* One of these cells is placed in the longitudinal axis 



* Cf. Dendy's account of the larva of Crrantia la'byrinthica for similar cells, " On 

 the Pseudogastrula stage in the Development of Calcareous Sponges," ' Roy. Soc. 

 Yictoria Proc.,' 1889, pp. 93101. 



