358 Mr. A. Alcock oyi Indian Bathyhial Ftshes. 



this but the highly glandular mucous coat that contributes 

 most to the thickness of the wall. The great development 

 of the glands of the mucosa, which are compact little branch- 

 ing follicles, is in marked contrast to A. hicolor, where the 

 mucous membrane consists of simple columnar epithelium. 

 The loose submucous coat is honeycombed with (lymphatic ?) 

 channels and crowded with leucocytes ; but the large pig- 

 mented granular corpuscles which were so numerous in 

 A. hicolor are here few in number. 



The small intestine at its duodenal end and the pyloric 

 cseca appear, in transverse sections, to be identical in structure. 

 In both the mucous membrane is thrown into apparently 

 permanent longitudinal folds, and contains in its depth a 

 regular series of glands formed by a cluster of loculi opening 

 into the bottom of a long vestibule which would serve as a 

 duct. Microscopic cylindei'S of glandular substance, which in 

 stained sections has exactly the appearance of mammalian 

 pancreas, run in the mesentery, parallel with the pyloric 

 cgeca and in contact with them. 



19. Alepocephalus edentulus, sp. n. (PI. XVIII. fig. 2.) 



B. 6. D. 29. A. 35. V. 6. P. 9. L. lat. circa 50. 

 L. tr. 15. 



The length of the head is a little more than one fourth, 

 and the height of the much compressed body nearly one fifth, 

 of the total with the caudal included. The blunt snout is 

 barely equal in length either to the width of the interorbital 

 space or to the diameter of the eye, which is very nearly two 

 ninths the length of the head. The mouth- cleft is almost 

 horizontal, the jaws are even anteriorly, and the maxilla 

 reaches considerably behind the vertical through the centre 

 of the eye. Minute teeth occur in a row in the premaxillas 

 and mandibles, and there are a few inconspicuous and decid- 

 uous teeth on the prominent edges of the palatines only. 



Gill-openings very wide, the gill-membranes being attached 

 to the isthmus only quite anteriorly ; gill-rakers conspicuous 

 on all the branchial arches, and, to the number of about twelve 

 in the middle of the first arch, long and setaceous ; pseudo- 

 branchige small. Head covered with a velvety scaleless skin ; 

 body with scales that are so deciduous as to have entirely 

 disappeared, leaving only imprints. 



The long anal fin begins an eye-length behind the middle 

 of the body, measured without the caudal, and the shorter 

 dorsal arises in the vertical through the sixth or seventh anal 



