inscrssiox of si-ecies and theik lusTKir.riiox. 



Ill 



from the caudal base. The fourth and longest ray nearly equals the greatest Height of the 

 body. The distance of the dorsal origin from the caudal base is contained 5| timesinthe 



total length. The longest dorsal ray, which is in the middle of the tin. is one-half as long as 

 the longest of the ventral rays. The length of the dorsal base is contained 0' times in the 

 total length. The base of the anal is slight ly longer than that of the dorsal, and its longest 

 ray is about three-fourths as long as the longest dorsal ray. The caudal lobes in the only 

 specimen available for study are unequal, the lower one being much longer than the upper, 

 but this may be the result of accident. There are two rows of luminous spots, one close to 

 the ventral outline, which becomes obsolete before it reaches the origin of the anal, and 

 another in the lower third of the height of the body, which becomes indistinct about the 

 middle of the total length; 14 of these spots between the pectoral and the ventral in the 

 lower series and 11 in the upper series. 



Eadial formula: D. 20; A. 24; V. 7; P. 1+3; C. 17. 



The type of the species is a specimen Kit) millimeters long (Catalogue, No. 37370), taken 

 by the Albatross at station 2565, N. lat. 38° 19' 20", W. Ion. 69° 02' 30", from 2,009 fathoms. 



PACHYSTOMIAS, GUnther. 



Echiostoma, sp., GCnther, Ann. and Mag. Nat. Hist., n, 1878, 180. 



Pachystomias, Gcnther, Challenger Report, xxn, 210 (type, P. murodon, GuirrnER, /. c,, 210. pi. liii, fig.c). 



A genus of Stomiatoid fishes, with naked body, normal pectorals, toothless vomer and 

 mamillaries, and comparatively feeble dentition. Luminous organs large and numerous. 



This genus is known by a single species, Pachystomias microdon (fig. 134), captured 

 by the Challenger at the depth of 2,440 fathoms, to the northeast of Australia. 



BATHOPHILUS, Giglioli. 

 Bathophilus, Giolioli, Pelagos, p. 261, figure, Gunther, Challenger Report, xxii, 215. 



Body compressed, rather short, scaleless, minutely granulated; vent far behind the 

 middle of the length. Head compressed; cleft of the mouth very wide; teeth stout. Eye 

 small. Barbel none. Dorsal fin opposite to the anal, which commences behind the vent. 

 Pectoral fins long, ventrals narrow, inserted high upon the side of the trunk. No luminous 

 organs ( f). A single species, B. nigerrimus (fig. 136), taken at Messina by Giglioli, and 

 now in the Florence museum. 



EUSTOMIAS, Vaillant. 



Eustomias, Vaillant, La Nature, 1884, 85 (name only mentioned) ; Exp. Sci. Travailleur et Talisman, 1888, 

 112 (type, E. obscurus, Vaill.). — GCnther, Voy. Chall., xxn, 204. 



Stomiatids, with anal fin much longer than dorsal and beginning farther forward. 

 " Barbel very elongate. Ventrals composed of two groups of rays. Jaws strongly armed 

 with teeth in single rows; teeth absent from palatines, but present on the tongue. Body 

 entirely naked, but with numerous longitudinal luminous dots, and a large luminous body 

 directly behind the ye." ( Vaillant.) 



A single species, E. obscurus, from off the Azores, at a depth of 2,792 meters. 



EUSTOMIAS OBSCURES, Vaillant. (Figure 135.) 

 Eustomias obscurus, Vaillant, Exp. Sci. Travailleur et Talisman, 113, pi. Ill, figs. 3, 3a. 



Body elongate: height scarcely one-twentieth of length, and thickness one thirtieth. 



The head, whose length is one-seventh of the length of the body, is conical, compressed; 

 the lower jaw projects beyond the upper: the snout half the length of the head: mouth 

 very large, although the maxillary does not extend far behind the orbit: the intermaxillary 

 has 2 long, fang like teeth, and 11 others less conspicuous but strong; the tirst and the 

 fifth in the latter series are the strongest, the last the smallest. On the maxillary the 

 teeth are visible only with the aid of a magnifying glass; the teeth upon the mandibles are 



