564 H. LYSTER JAMESON, 



£x:planatîoii of the Figures. 



Plate 28. 



Fig. 1. Section of the epidermis of Thalassema neptuni in the 

 interval between two papillae, where the great glands are not present, 

 cu cuticle, al alveolar layer of cuticle, ep. c columnar cells, ep. n nuclei 

 of the same, c. c clear cells, c. n nuclei of the clear cells, op opening 

 of a clear cell through the cuticle, c. t cutis, c. i. n nuclei of the cutis. 



Fig. 2. Longitudinal section of the epidermis on the summit of a 

 papilla, where the glands are numerous ; gl. c gland cell , gr deeply 

 staining granules in the same, gl.n nucleus of gland cell; other letters 

 as in Fig. 1. 



Fig. 2 a. A piece of the cuticle, highly magnified ; ep. c columnar 

 cells, gl. c neck of a gland cell, al alveolar layer, cu cuticle, cu' deeply 

 staining outer layer of the same. (Seibbrt, apochr. 2 mm.) 



Fig. 3. The cuticle on surface view, showing reticular structure. 

 From a macerated preparation. 



Fig. 4. Piece of the cuticle showing impressions of the columnar 

 cells, ep ; and openings of the glands, gl. 



Fig. 5. Horizontal section of the epidermis ; ep. C columnar cells, 

 ep. n nuclei of the same, c. C clear cells, c. n their nuclei, gl a gland. 



Fig. 6. Sense organ from the epidermis of the proboscis ; s. C sense 

 cells, gang, c ganglion cell ; other letters as in Figs. 1 and 2. 



Fig. 7. Transverse section of the musculature in the proboscis; 

 m muscle fibres, m.n nuclei of the muscle fibres, c.f connective tissue 

 matrix, c. t. n nuclei of the same. 



Fig. 8. Sections of muscle fibres, a, b, c and d, showing the relative 

 reduction of the central plasma towards the ends of the fibres ; e, a 

 small (? young) fibre, with nucleus. 



Fig. 9. Piece of a muscle fibre from a macerated preparation of 

 the body wall, showing alveolar structure; nu nucleus, s sarcolemma, 

 pe pellicle, I connective tissue languets. (Seibbrt, apochr. 2 mm, comp.- 

 ocul. 12.) 



Fig. 10. Piece of a muscle fibre with spirally arranged "contractile 

 plates" or fibrillae; nu nucleus. (Macerated preparation.) 



