4 6 



Records of the Indian Museum. [Voi,. XXIV, 



of the first pectoral and pelvic rays (fig. i, a). Besides this the 

 striated region is supported by a definite, highly specialized tissue 

 (fig. 16, s.t.). The chest is absolutely devoid of any adhesive ap- 

 paratus. In certain species of the same genus the under surface 

 of the barbels and the skin near their bases is striated (fig. Ha). 



Text-fig. 8. — Structure and form of the pectoral fins and the position of the 

 adhesive apparatus in Glyptosternitm labiatum. 



a. Under surface of head and chest showing striated skin on pectoral 



spines and on maxillary barbels. 



b. Pectoral fin showing reflected inner rays. 



c. Under surface of pectoral spine highly magnified. 



The disc of Garra (fig. ga) with its associated structures 

 is an efficient type of adhesive organ. The disc consists of a 

 central callous portion (h) and of free tuberculated lateral and 

 posterior borders (g). Its anterior border is formed by the poste- 

 rior labial fold (/) which in its development has replaced the 



