' DISCUSSION OF SPECIES AND THEIR DI.STKIliUTIOX. 115 



PHOTOSTOMIAS GUERNEI, Collett. (Figure 140. ) 

 Phoiostomian Giieriii, Collett, linll. Soc. Zool. France, IHSd, 291. 



The greatest height of the body, behiud the veutrals, is inckulcd eight aud a half times 

 in its total length; the length of the head five and a half in total length. Eye moderate, 

 its diameter contained live and a half times in the length of the head. Mouth slightly 

 ()bli(ine, very large. Intermaxillary teeth about eight in number, those of the upper jaw 

 very small aud serrated. The dorsal and anal are very far back, opposite. Ventrals 

 elongate, villiform, extending behind the vent. Caudal much furcate. 



The anterior luminous orgau above the maxillary is rudimentary. 



Eadial formula: D. 24; A. 27; V.O.; V.15; C. 27. 



Color, dull black, this color extending even into the inside of the mouth. 



The type of this species, a single specimen, a female containing eggs nearly mature, 

 was taken on the 30th of June, 1887, by the HirondvUe, at a depth of 1,138 meters, oft 

 the Azores, in 38° 34' iO" N. Lat., SO^ 43' 30" W. Long. The species is named in honor of 

 Baron Jules de Guerne, of Paris, who accompanied Prince Albert of Monaco on the 

 Hirondelle, in the capacity of zoologist. 



THAUMASTOMIAS, Alcock. (Figure 141.) 

 Thaumastomias, Alcock, Auu. aud Mag. Nat. Hist., 1890, ii, 220, pi. vni, lig. 7. 



A genus allied to Phofostomias, from which it is distinguished liythe presence of teeth 

 upon the palatines, liody elongate, compressed, scaleless, with the vent not far distant 

 from the caudal fin. Head compressed, with the cranium small, tlie snout short, and the 

 cleft of tlie mouth exceedingly wide. A long, elastic muscular baud passing from the hyoid 

 bone to the inner aspect of the mandibular symphysis. Teeth acute, uue(iual, in single 

 series in premaxilbB, mandibles, and palatines; none on the tongue. Eye moderate. Gill- 

 covers rudimentary. One dorsal flu opposite to the anal, situated in the posterior fourth 

 of the body near the caudal. No iiectoral fins. Ventral fins situated in the anterior half 

 of the body. Gill-openings very wide. No air-bladder. 



The type of this genus, T. atrox, Alcock, was taken oft' the coast of Madras, at a depth 

 of 1,310 fathoms, by the Iiirestigafor, station 97. 



Family ALEPISAURID^^. 



Alcpidosaunna, GOnther, Cat. Fish. Brit. Mus., v, 1864 (group third iu family Siupclidw). 



AlepisaiiroUlei, Bleekek, Enum. Sp. Pi.so. Arch. Ind., xxii, 1859, 22. 



Alepidosaui-idw, Boy XPARTE, Cat. Metiid., 1846, 8; Cou.spectus, 1850.— Adam.s, Man. Nat. Hist., 18.54, 99.— Gill, 



Arrangement Families of Fishes, 1862, 16 (Family No. 161).— Jordan and Gilbert, Bull, xvi, U. S. Nat. 



Mus., 274. 

 Alepidosauroidw, Gill, Proc. Acad. Nat. Sci. Phila., xvi, 1864, 187. 

 Alepisauridte, Gill, Science, III, 620, 1884. 

 SphyraimUe, gen., Lowe, Trans. Zoiil. Soc. London, 1835, 123. 



Malacopterygians with the mesocoracoid wanting or atrophied. Post-temporal imping- 

 ing upon occiput. Vertebra? and interspinous processes nornml. Photophores and barbel 

 absent. 



Body elongate, compressed, scaleless. Snout produced, the mouth cleft very wide. 

 Premaxillary very long and slender, not protractile, forming entire margin of upper jaw. 

 Maxillary thin, long, immovable. 



Teeth very unequal, immovable; a series of small teeth occupying entire length of pre- 

 maxillary; those in front sometimes larger and curved. Palatine teeth triangular, pointed. 

 Teeth on lower jaw like those on palatines. Tongue toothless. 



Gill membranes not united, free from isthmus. Gill rakers short, spine-like. Bran 

 chiostegals 5-7. Pseudobranchi» large. Opercular bones thin, meinbranaccons. Dorsal 

 fin very long, occiqyyvng nearly the whole of the bael-; adipose fin present; anal fin moderate; 

 caudal forked. Air bladder none. 



