1922.] 



S. L. Hora : Fish of Mountain Torrents. 



Within the genus Glyptotho- 

 rax, the structure of the adhe- 

 sive apparatus shows consider- 

 able variation. In G. dorsalis, 

 a large number of specimens 

 of which were collected in the 

 sluggish and muddy streams 

 of the Manipur Valley, the 

 spines are small and the spin- 

 ous layer as a whole is not well 

 developed. The epithelium is 

 composed of several tiers of 

 small, squarish cells; of these 

 the uppermost and the basal 

 layers are highly vacuolated. 

 The cell-walls are quite distinct 

 and the basal laj'er is somew 

 Hum is a dense sheet of counec 



"s.t.c. 



Text-fig. 18. — Transverse sec- 

 tion through a portion of the thoracic 

 adhesive apparatus of Glyptothorax 

 madrasapatanus, x 435. 



s. = spine; h.s. = nucleus of the 

 spine ; n.c.l. = noncellular layer ; c . = 

 first row of cavities ; c". = second row 

 of cavities; c.e. — columnar epithe- 

 lium ; b.c.= basal cells of epithelium ; 

 c.t. = connective tissue. 



kind of structure. 



^c.t.o. 



Tkxt-fig 17. — Transverse section 

 through the supporting tissue of the 

 adhesive apparatus on the fins of Glypto- 

 sternttm labiatum, x 435- 



c J r. = connective tissue cells ; s,t.c, 

 = supporting tissue cells 



hat columnar. Below the epithe- 

 tive tissue, in which are scattered 

 big cavities full of blood cor- 

 puscles. Underneath the con- 

 nective tissue are fat-cells with 

 eccentric nuclei. In G. madras- 

 patamis the structure (fig. 18) 

 of the adhesive tissue is more 

 advanced in so far as the cell- 

 limits are not distinguishable. 

 Immediately below the non-cellu- 

 lar region there are two layers 

 of cavities (c'.c".) ; the upper is 

 in the form of elongated spaces 

 with intervening columns of pro- 

 toplasm, while the second layer 

 consists of rounded cavities in 

 the substance of the protoplasm. 

 Below this the epithelium con- 

 sists of a row of columnar 

 cells which are followed by a 

 number of small, rounded cells. 

 In the basal epithelial layer I 

 have not been able to find any 

 nuclear structures. The greatest 

 specialization in the structure of 

 the adhesive tissue within the 

 genus is reached in those forms 

 that possess an adhesive surface 

 on the chest as well as on the 

 under surface of the pectoral and 

 pelvic spines. I take G. sp. from 

 Madras as an example of this 



