REPORT ON THE DEEP-SEA FISHES. 267 



Monacanthus tessellatus. 



Monacanthus tessellatus, Guntb., Report on the Shore Fishes, Zool. ChaU. Exp., pt. vi. p. 54, 



pi. xxiii. fig. B. 



One specimen, 5 inches long, was obtained at the PhUippine Islands, Station 204, 

 where the trawl descended to a depth of 115 fathoms, 



CYCLOSTOMATA. 

 Myxine, L. 



The habits and vertical distribution of all the Myxinidaj are probably the same, Init 

 we possess positive information on these points in the case of two species only. 



Myxine glutinosa, L. 



The common North Atlantic species is locally abundant at small depths, as, for 

 instance, in the Norwegian Fjords, at 70 fathoms. . Messrs. Goode and Bean have found 

 it in the collections made on the Atlantic coast of North America, at depths of from 

 172 to 524 fathoms.! 



Myxine australis (Jenyns). 



This species, which is common on the coast of the southern extremity of the 

 American continent, occurs also in the Japanese Sea, half a dozen specimens from 9 to 20 

 inches long having been taken on the Hyalonema ground at a depth of 345 fathoms 

 (Station 232). I also believe that Heptatrema cirrhatum of Schlegel, should be referred 

 to the same species. The three foremost teeth of the inner series are invariably confluent 

 at the base, but in adult specimens they are neither longer nor stouter than the next 

 succeeding. The branchial apertures are subject to some variation, a specimen from 

 Magellan Strait having two on the left side and one on the right. Also the pores of 

 the lateral line may be sometimes very distinct, sometimes scarcely conspicuous; and it 

 appears to me that the smaller foramina represented in Schlegel's figure of Heptatrema 

 cirrhatum are nothing else but those of the lateral line, which in the specimen figured 

 were unusually conspicuous, as I have also seen them in specimens from Magellan Strait. 



Finally, a Lamprey has also once been obtained at a depth of 547 fathoms in the 

 Atlantic, lat. 40° 0' N., long. 68° 50' W., and noted as Petromyzon (Bathymyzon) 

 hairdii, which is said to be distinguished from other Lampreys by the obsolescence of the 

 cusps of the dental laminse. No indication is given as regards the size of the specimens.- 



1 Ball. Mus. Comp. Zool., vol. x., 1883, p. 226 ; and Proc. U.S. Nat. Mus., vol. iii., 1881, p. 486. 



2 Gill, Proc. U.S. Nat. Mus., vol. vi., 1884, p. 254. 



