42 ART. 8. 1. IKEDA : THREE NEW AND 



proper. The glands originate without doubt each from an 

 ej^idermal cell, and assuming a long and club-like shape, have 

 sunk deep into the subepidermal mesenchyme. 



Kight close to the internal surface of the basal membrane 

 is the dermal musculature, which consists of the two systems of 

 the external longitudinal and the internal circular muscle fibers 

 (figs. 44 and 4;j, I.m. and cm.). Both systems are made up of 

 fine muscle fibers running closely side by side in a single layer. 



Almost all the parts internal to the dermal musculature are 

 occupied by the massive mesenchyme or the connective tissue, 

 in which lie imbedded the pigments, the muscles of the deep 

 parts, the nerves and all the rest of internal organs. Struc- 

 turally, a distinction may be drawn between the mesenchyme 

 of the periphery and that of the inner parts, although the two 

 insensibly merge into each other. The latter forms by far the 

 greater portion of the entire tissue. It is distinctly, though very 

 loosely, fibrous, the fibers running mostly in the dorso-ventral 

 direction. They are seen to be fine long processes, emanating 

 directly from certain isolatedly situated cells — the connective- 

 tissue cells (figs. 44, 46 and 47, c.t.c.) — which are either spindle- 

 shaped and bipolar or irregularly shaped and multipolar, so to 

 say. The fibers and cells lie in a space which appear to be 

 occupied by a clear fluid, probably of a lymph-like nature. 

 Occasionally met with in that space are roundish cells without 

 processes and which may be identified as wandering cells (fig. 

 44, W.C.). 



The mensenchyme of the periphery (fig. 44, p-c), forming 

 an indefinite, but on ~ the whole thin, layer just beneath the 

 dermal musculature, consists of rather closely disposed, irregularly 

 shaped cells, which at places are apparently in direct fusion and 



