EEPORT ON THE DEEP-SEA FISHES. S 



The teeth (PJ. LXIV. figs. A and B) are arranged with great regularity in series crossing 

 the jaws obliquely. Each anterior series consists of six, and the posterior ones of five teeth, 

 to which generally from one to three in an immature state of development are added. The 

 series are separated from each other by a toothless space which becomes narrower between 

 the posterior series ; the latter are composed of much smaller and rudimentary teeth ; 

 in fact, the last two or three series are almost confluent, rendering the number of series 

 somewhat uncertain, so that it may be given as twelve or thirteen on each side of the 

 upper jaw. There is a broad toothless space in the middle of the upper jaw, and the 

 two or three foremost series are bent outwards beyond the margin of the jaw, so that the 

 two or three foremost teeth are entirely outside the buccal cavity. The lower jaw is 

 armed with one unpaired additional series on the symphysis ; in other respects, with 

 regard to position, arrangement and number, the teeth of the lower jaw do not difi'er 

 from those of the upper. Each tooth consists of au oblong base bearing on its 

 anterior portion three long, divergent, pointed, spine-like cusps, with a pair of much 

 smaller ones between. These cusps are directed backwards over the base of the tooth. 

 On its lower side the base has anteriorly a pair of shallow grooves [rj) to receive two 

 short pointed processes (ji) in which the base of the preceding tooth terminates ; by these 

 processes fitting into the grooves of the succeeding tooth, the union of the links of the 

 dental chain is effected. In the rudimentary teeth of the posterior series the base of each 

 tooth is very much abbreviated ; the cusps also are much shorter and have a more erect 

 position. In the teeth of the series which may be considered the last, the outer cusp 

 is even entirely lost or quite rudimentary ; in fact, these minute teeth differ very little 

 from the enlarged papillte of the surrounding skin. 



The stomach is an extremely long cylindrical sac with thin walls ; the short and 

 narrow intestine, after having made a short and incomplete convolution, passes into the 

 dilated portion which contains the spiral valve. This portion (PI. LXV. figs. 5 and 6) has 

 extremely strong muscular walls, from 3 to 4 mm. thick. The spiral valve makes thirty- 

 five gyrations, this part of the intestine being six and a half inches long. A globular 

 glandular body (fig. 3, gl) of the size of a large pea lies dorsad of the cloaca, into which 

 it discharges its secretion by a short duct. 



The liver consists of two extremely long lobes which reach backwards to the end of 

 the abdominal cavity, and anteriorly receive the gall-bladder between them ; this organ 

 is of moderate size. 



The testicles are narrow elongate bodies of nearly equal size, about 5 inches long 

 and half an inch broad at the broadest part. Although our specimens seem to be sexually 

 mature, I am uncertain whether they were captured during the season of propagation. 

 The testicles reach close to the upper end of the abdominal cavity. In one of the males 

 the arrangement of the urogenital organs and ducts, as well as of the external openings, 

 is perfectly symmetrical and normal (fig. 1), whilst in the other the left side shows a 



