GLOW-FISHES 239 



the whole structure being nourished by special blood- 

 vessels, and being brought under the owner's control 

 by special nerves. These light-giving organs are not 

 always so complicated as this ; but whatever their 

 form, they are all regarded as modifications of 

 structures found in ordinary fishes, the phosphorescent 

 glands being modified slime-glands, and the reflector 

 and light-proof screen being modified portions of the 

 skin. In Lamprogrammus niger (Fig. 17) and in 

 Halosaurus niger7dmus (Fig. 37), the former being an 

 inhabitant of depths varying from 405 to 561 fathoms, 

 the latter being found off the Maldives in 459 fathoms, 

 the lanterns are embedded in a row of enlarged scales 

 running along the lateral line, like a row of port-holes 

 in a ship. In Diplophos corythceolum (Fig. 38), dredged 

 in the Andaman Sea at 185 to 405 fathoms, most of 

 them are banked in two tiers along both sides of the 

 body, like rows of ''bull's-eyes." In Photostomias 

 atrox (Fig. 39), taken in the Bay of Bengal in 13 10 

 fathoms and in the Andaman Sea in 606 fathoms, in 

 addition to two rows of small luminous glands along 

 the body, there is a huge out-standing phosphorescent 

 patch on either side of the cheek. In Leptoderma 

 ajfL7iis (Fig. 35), as already mentioned, the whole 

 epidermis seems to be tranformed into a phosphor- 

 escent overcoat, and in Aidastomomorpha phosphor ops 

 (Fig. 40), an Alepocephaloid dredged in 1000 fathoms 

 in the Laccadive Sea, the skin of the entire head is 



