DISCUSSION OF SPECIES AND THEIR DISTRIBUTION. 103 



about half tliis dimension in the ultimate rays. The jiectorals and veutrals are short and 

 feeble, the ventral inserted about midway between the tip of the snout and the root of the 

 caudal tin. Pectoral about midway from the tip of the snout to the origin of the anal. The 

 caiulal apparently about equal to the head in its length, but being mutilated, its form can- 

 not be accurately determined. The scales resemble those of Gonostoma, without radiating 

 lines. A single row of rather conspicuous phosphorescent spots extends from the lower 

 Jaw beneath the eye, to the end of the aual on either side, these dots being heavily mar- 

 gined and with black above. There are twelve of these between the branchial opening 

 and the origin of the ventral, five between the ventral and the anal, sixteen in the anal 

 series, and two upon the caudal peduncle, one at the origin of tlio lower caudal rays, the 

 other in the vertical above it and about one-fiftb of the distance from the dorsal outline. A 

 series of vertical, elongated spots, apparently pbosphoresceut, upon either side of the lower 

 jaw, giving it a pectinate appearance. 



Color (in alcohol) brownish gray; the head with sihery reflections. 



Radial formula: 1). 20; A. 30; L. lat. 46. 



The types of this species are two specimens, about one and two inches long respect- 

 ively, obtained by the steamer Albatross from station 2042 in 25° 20' 30" N. Lat., 79° 58' 

 W. Long., at a depth of of 217- fathoms. 



YARRELLA, Goode and Bean, n. g. 



Body elongate, compressed, covered with rather large, thin, deciduous scales ; the lower 

 parts with luminous spots. Head conical, compressed; cleft of mouth very wide, oblique, 

 extending behind the eye. Lower jaw strongly projecting. Intermaxillary comparatively 

 long, forming about half of margin of upper jaw. Tapper jaw with a single row of teeth in 

 the maxillary, and a double row in the intermaxillary, interspersed with occasional stronger 

 teeth; those in the intermaxillary directed downward or backward, those in the maxillary 

 somewhat forward. Mandible with double row of small teeth, outer row Avith some larger 

 ones. A row of short, weak teeth on the palatines ; head of vomer with a short fang on 

 either side. Eye moderate; gill openings very wide, the membranes free from the isthnuis. 

 Gill rakers not very numerous, rather short and stout. Pseudobranchias none. Branchi- 

 ostegals numerous, 14. No air bladder. Dorsal and anal well developed, the former far in 

 advance, its posterior rays over the origin of anal. No adipose fin. Caudal moderately forked. 



This genus is in several respects intermediate between Gonostoma and Photichthys. It 

 is named iu honor of William Yarrell, P. L. S., (1789-1S5C), the English ichthyologist. 



YARRELLA BLACKFORDI, Goode and Bean, ii. s. (Figure 121.) 



Body elongate, its greatest depth equal to length of head without snout, and contained 

 Ii times in the total (without caudal). Length of head 4i times in total (without caudal). 

 Eye moderate, its diameter two-thirds length of snout, and contained 7 times in length of 

 head. The maxillary extends far behind the eye, its length equal to that of the i)ostorbital 

 part of the head. Length of intermaxillary nearly two-fifths length of head. Teeth as 

 described under genus. Gill rakers 6 above and 1?> below the angle of the first arch, the 

 longest about as long as the eye. Branchiostegals, 14. Dorsal origin a little nearer root 

 of caudal than tip of snout, its origin nearly over the middle of the space between thcA'en- 

 tral and the anal origin, and its jtosterior ray over the seventh ray of the anal; the length 

 of its base equals that of postorbital part of head ; rays imperfect, the longest fragment 

 remaining equal to longest of anal, and not much more than one-third length of head. 

 Distance of ventral origin from tip of snout contained 2i times in total (without caudal): 

 rays imperfect, the longest onlj' about one-fourth of length of head. Pectoral jilaced low, 

 on a narrow base. Scales have evidently been present, and of considerable size, but their 

 character and number can not be ascertained. 



Eadial formula: D. 15; A. ii, 27; V. 0; P. 8. 



Color, purjdish brown; 9 phosphorescent spots on the isthmus, 25 between the sjm- 

 physis of the mandible and the root of ventral, 12 between the origin of ventral and vent. 



