50 



Records of the Indian Museum. [Vol. XXIV , 



The structure of the mental disc in Garra may be treated 

 under two headings, (i) the structure of the central callous portion 

 of the disc and (ii) the structure of its tuberculated borders and 

 of the fringed tuberculated anterior labial fold (fig. 12). The 

 structure of the former is very similar to that of the integument 





a/. "■ 



Text-fig. 12. — Structure of tubercles on the disc and the anterior 

 labial fold of Garra annandalei. 



a. Tubercle on anterior labial fold. 



b. Tubercle on lateral free borders of the disc. 



described above. The following are, however, some salient points 

 of difference : — 



(i) The epithelial cells are better defined and in certain 

 places the ampulliform gland-cells are more numerous. 



(ii) The " clavate cells " are fewer in number and are situat- 





■#&»:. ■.-■■!» v. - , 



: V.?/*::<2>-.'': :: ::-: ' 



Text-fig. 13. — Transverse section through a portion of the tuberculated 

 anterior labial fold of Garra annandalei, x 43s. 



s = spine ; ep.d. =: epidermis ; d= dermis. 



ed at great intervals. The protoplasm of these cells has receded 

 inwards from near their upper cell-limits. 



(iii) The dermis is chiefly composed of an adipose tissue, which 

 is bounded both above and below by a thin layer of fibrous con- 

 nective tissue. 



