Mr. A. Alcock on Indian Dathyhial Fishes. 'dbd 



llie submucous coat most remarkably developed, and with a 

 structure like that of the cortical substance ot" mammalian 

 lymphatic gland ; it consists of a very perfect and regular 

 network of fine connective-tissue trabeculae, the long narrow 

 meshes of which are crowded with leucocytes; a dense layer 

 of pigment bounds the submucosa externally. 



Chauliodus, B1. Schn. 

 14. Chauliodus Sloanit, Bl. Schn. 



Several specimens were obtained in the Laccadive Sea. 



The stomach of Chauliodus^ like that of Oonostoma, is 

 remarkable for the great development of its submucous coat, 

 which, in transverse section under the microscope, is seen to 

 be formed of a very regular and perfect corniective-tissue 

 network, of which the meslies are filled with deeply staining 

 (carmine) leucocytes imbedded in a granular matrix — a struc- 

 ture not at all unlike that of the cortex of mammalian lym- 

 phatic gland. In many sections the larger septa, by whose 

 regular ramifications the network is formed, pass straight 

 through the muscular coat to the external fibrous coat of the 

 viscus. 



15. Chauliodus pamtnelas, sp. n. 

 B. 16. D. 6. A. 12. V. 7. P. 11-12. 



Closely resembles Chauliodus Sloaniiy from which it differs 

 only in the following points : — (1) The body is much deeper, 

 and has in life well-markedly convex dorsal and ventral 

 profiles ; (2) the eye is relatively much larger, its diameter 

 being equal to the length of the snout measured to the extre- 

 mity of the outstanding mandibular symphysis, or two 

 sevenths the length of the entire head, or nearly two thirds of 

 the length of the longest mandibular fang ; (3) the skin is 

 ap])arently naked, and though there are rhomboidal and hexa- 

 gonal pits, these contain no silvery scale-like plates, but only 

 a central " luminous " spot, and the entire body is covered in 

 life with a thick sheet of transparent mucoid tissue traversed 

 by capillary blood-vessels; (4) the ventral "luminous organs" 

 are less numerous and very much smaller, and the suborbital 

 organ, which in C. Sloanii is so conspicuous, is reduced to a 

 minute point distinguishable only with a lens; (5) the first 

 ray of the dorsal fin is relatively longer ; (6) the body, fins, 

 and iris arc uniform jet-black. 



A very line specimen, 10 inches long, from Station 120, 

 1370 fathoms. 



