DISCUSSION OF SPECIES AND THEIR DISTRIBUTION. 11") 



PHOTOSTOMIAS GUEENEI, Coi LETT. (Figure 140.) 

 Photostomiaa Guerni, CoiXETT, Bull. Soo. Zool. France, 1889, 291. 



The greatesl height of the body, behind the centrals, is included eight and a hall' times 

 in its total length; the length of the head live and a half in total length. Bye moderate, 

 Its diameter contained five and a half times in the length of the head. Mouth slightly 

 oblique, very large. Intermaxillary teeth about eighl in number, those of the upper jaw 

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

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



The anterior luminous organ above the maxillary is rudimentary. 



Radial formula: 1). 24; A..27; P.O.; 7.15; (J. 27. 



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



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

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

 the Azores, in :;s 34' 30" N. Lat., 30° 43' 30" W. bong. The species is named in honor of 

 baron Jules de Guerne, of Paris, who accompanied Prince Albert of Monaco ou the 

 HirondcUv, in the capacity of zoologist. 



THAUMASTOMIAS, Alcock. (Figure 141.) 

 Thaumastomias, Alcock, Ann. and Mag. Nat. Bist., 1890, n, 220, pi. vin, lig. 7. 



A genus allied to Photostomias, from which it is distinguished by the presence of teeth 

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

 from the caudal tin. Head compressed, with the cranium small, the snout short, aud the 

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

 bone to the inner aspect of the mandibular symphysis. Teeth acute, unequal, in single 

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

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

 of the body near the caudal. No pectoral 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 off the coast of Madras, at a depth 

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



Family ALEPISAURID^E. 



Alepidosaurina, Guntuer, Cat. Fish. Brit. Mus., v, 1864 (group third iu family Srojielidw). 



Alepisauroidei, Bleeker, Eimm. Sp. Pise. Arch. Intl., xxn, 1859, 22. 



AlepidoaauridcB, Bonaparte, Cat. Metod., 1846, 8 ; Conspectus, 1850. — Adams, Man. Nat. Hist., 1854, 99. — Gill, 



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



Mus., 274. 

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

 Alepimuridw, Gill, Science, in, 620, 1884. 

 Sphyrcenidas, gen., Lowe, Trans. Zool. Soc. London, 1835, 123. 



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

 ing upon occiput. Vertebra* and interspinous processes normal. 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. Pseudobrauchiae large. Opercular bones thin, membranaceous. Dorsal 

 tin very long, occupying nearly the whole of the bach; adipose fin present ; anal fin moderate; 

 caudal forked. Air bladder none. 



