1909.] R- K. Ivi^OYD : Deep-Sea Fish caught by the " Investigator ^ 155 



length than the diameter of the eye, and of an inner series of three much larger teeth 

 the middle one of which is situated beneath the eye and is as long as the snout. All 

 teeth are completely depressible except the foremost of the outer row which are only 

 partially so. There are five long depressible teeth on each palatine. There are well- 

 developed upper pharyngeal teeth. The vomers are toothless. 



The vent is half-way between the snout and the root of the tail. The pectoral fins 

 are nearly as long as the head. The ventrals arise below and behind the pectorals and 

 are about half their length. The second dorsal and the anal fins commence at the level 

 of the vent. The two ,dorsal fins are separated by a distance equal to the diameter 

 of the eye. In the specimen the skin of the anterior half of the body alone is present. 

 In this region the lateral line consists of a double series of circular white spots. There 

 are eighteen pairs of these from the highest point of the gill-opening to the level of 

 the vent. The stomach is cœcal and very large. It is empty and contracted but its 

 walls are very thick, much folded and covered with tortuous blood-vessels. There are 

 two pyloric caeca ascending on the left side of the stomach. An air-bladder is present. 



Judging from the character of the jaws, teeth, gills and stomach, we may assume 

 that this genus has, like Chiasmodus , the habit of swallowing large fish. 



One specimen, 17 cm. in length. Bay of Bengal, Station 312, 1,343 fathoms. 

 Registered No. ^^14 



Genus Dysa;.otus, MacGilchrist. 



A genus allied to Chiasmodus, Johnson, differing from it in possessing four series 

 of teeth in the jaws, and scales which are provided with thorn-like spines. It pos- 

 sesses a pseudobranch and pyloric caeca. 



Dysalotus alcocki, MacGilchrist. 



An7i. Mag. Nag. Hist. (7), vol. xv (1905), p. 268; Illustr. Zool. "Investigator," Fishes, 



pi. xxxvii (1905). 



B. 7, D. viii 27, A. 27, P. ii, V. i 5. 



' ' The body is elongate and compressed ; its height contained nearly eight times 

 in 'the total length, without the caudal. The head is large, low, and long, contained 

 about 3| times in the same standard length. 



The snout is very long and depressed, about 3 times the diameter of the eye and 

 more than ^ the length of the head. The eyes are lateral, wide apart, small, and deep, 

 set. The interorbital space is more than twice the diameter of the eye, nearly flat from 

 side to side, and traversed by two anteriorly converging ridges which enclose a' V- 

 shaped space. The nostrils are sHghtly nearer to the eye than to the tip of the snout. 



The mouth is very deeply cleft, reaching beyond the eyes. The lower jaw projects 

 beyond the upper ; no barbel. The mucous system of the head is well-developed. 



The body is naked except the posterior half or so, which is furnished with 

 (minute) spiny scales arranged for the most part in rows parallel to the lateral line ; 

 the spinules have a backward inclination. 



