On nucleolar structures of the hypodermal cells of the larva of Cnrpucapsa 391 



Explanation of Plate. 



Plate 27. 



All the figures have been drawn from sections with the aid of the 

 camera lucida. In Figs. 1 — 4, 6 and 10 the Ehrlich's haematoxylin- 

 eosin stain is reproduced, and in Fig. 5 the stain of Ehklich-Biondi- 

 Heidenhain. The following abbreviations have been employed: 



C giant cells of the body cavity 



Chr chromatin 



C. Mb cell membrane 



Cut cuticle 



Cy. PI cytoplasm 



G gonad 



Gl gland duct 



Hyp hypodermis 



Int epithelium of mid-gut 



M longitudinal muscle 



M. T Malpighian tubule 



N nucleus 



n true nucleolus 



n. 2 chromatin nucleolus 



N. C ventral nerve chord 



Sp cuticular spine. 



Fig. 1. Nucleus of the undifferentiated type of hypodermal cell 

 (homog. immers. ■'/12) °^- 4> tube length 200 mm). 



Fig. 2. Nuclei of the hypodermis, from the proximal end of an 

 extremity. The hypodermis is tangentially sectioned, the lines marked 

 X denoting its boundaries (as in Fig. 1). 



Fig. 3. Idem, from a section nearer the distal end of an ex- 

 tremity (as in Fig. 1). 



Fig. 4. Idem, from a section at the distal end of an extremity 

 (as in Fig. 1). 



Fig. 5. A single hypodermal nucleus from the distal end of an 

 extremity (as in Fig. 1). 



Fig. 6. Transverse section through the hypodermis on the side 

 of the body , at a point where a group of spine-producing cells is 

 attached to the hypodermis; the cuticle of the latter is not drawn. 

 Of the spine-producing cells the nucleus and cytoplasm of only one 

 are drawn in detail, nuclei of other two cells being merely outlined 

 (homog. immers. ^/^^j ^^- ^)- 



Fig. 7. Transverse section through the hypodermis on the side 

 of the body, showing a group of large cells and the proximal portion 

 of the spine produced by them (obj. 0, oc. 4). 



Zool. Jahrb. XIII. Abth. f. Morpli. 



26 



