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bulletin: museum of comparative zoology. 



Lyon, Ehrlich's stain and picric acid-fiichsin, and Ehrlich's stain and 

 Orcein; impregnation after Bielschowsky was also used. 



The results at which I have arrived after studying these microscopi- 

 cal preparations are entirely different from those which Gadow pub- 

 lished in his paper already referred to. Each appendage consists of 

 an inner cutis papilla and an epidermal outer layer of Aery peculiar 

 appearance. This outer layer is made up of many longitudinal ridges 

 of epidermis cells, between which are found deep longitudinal grooves. 

 These grooves are filled with the cutis tissue. In transverse section 

 (Fig. A) this condition is very conspicuous, reminding one somewhat 

 of the transverse section of a developing feather. 



The stratum corneum is not thick, but quite distinct, and outside 

 this is still another continuous external layer of horny cells, which 

 form a kind of loose covering, thus indicating that these appendages, 



Fig. A. Transverse section of one of the liair-like appendages. ('■, blood vessel; 

 c, cutis; e, epidermis. 



Pig. B. Portion of a longitudinal (radial) section of hair-like appendage, showing 

 tactile cells in one of the cutis ridges. ch. chromatophore; e. epidermis cells; /;, 

 stratum corneum; ?i. nerve fibre; tc tactile cells. 



like the rest of the skin, periodically slough their superficial stratum 

 corneum. This statement does not agree with Gadow's sentence: 

 " Die Epidermis ist weich und weder besonders verdickt noch irgend 

 wie verhornt." On the other hand, I was not able to find the great 

 number of glands which Gadow describes; at least, they are not more 

 numerous than in other parts of the skin. 



