collected during the Voyage of the 'Challenger.^ 249 



total (without caudal) ; snout projecting beyond the mouth. 

 Black. 



North of Australia, 1400 fathoms. 



Platytroctes, g. n. Alepocephalid. 



Body rather abbreviated, much compressed, and covered 

 with small keeled scales. Mouth of moderate width ; the 

 maxillary and intermaxillary and mandible armed with a 

 single series of small teeth. Palate smooth. Eye rather 

 large. The dorsal and anal fins opposite to each other, on 

 the tail, moderately long. Adipose fin none. Caudal forked. 

 Pectoral small. Ventrals none. The humeral arch terminates 

 in the middle of the chest in a long, projecting, acute spine. 

 Gill-opening wide ; six branchiostegals. Gills very narrow ; 

 pseudo-branchise present ; gill- rakers long, lanceolate. Py- 

 loric appendages rudimentary. 



Platytroctes apus. 

 D. 18. A. 17. 



The height of the body is more than one third of the total 

 length (without caudal) ; the diameter of the eye one third of 

 the length of the head. The maxillary does not extend to 

 below the middle of the eye. 



Mid Atlantic, 1500 fathoms. 



Bathytroctes, g. n. Alepocephalid. 



Body rather elongate, compressed, covered with scales of 

 moderate size. Cleft of the mouth rather wide, the maxillary 

 extending to below the middle of the large eye. Both inter- 

 maxillary and maxillary armed with a series of minute teeth, 

 as is also the mandible. Vomer and palatine bones with 

 similar teeth. No teeth on the tongue. Eye very large. 

 Dorsal and anal fins moderately long, the former behind the 

 ventrals. Adipose fin none. Caudal forked. Gills very nar- 

 row ; pseudo-branchias present ; gill-rakers long, lanceolate. 

 Pyloric appendages in moderate number. Ova rather small. 



Bathytroctes microlepts. 



B. 7. D. 16. A. 17. V. 8. L. lat. ca. 70. 



The maxillary extends to below the posterior third of the 

 orbit. 



South-east ofi" Cape St. Vincent, 1090 fathoms. 



Ann. & Mag. N. Hist. Ser. 5. Vol. ii. 17 



