SCIENTIFIC RESITLTS OF EXPLORATIONS I3Y THE U. S. 

 FISH COMMISSION STEAMER ALBATROSS. 



[Published by iiormission oC lion. Marshall Mcl)i)uald, ('oiiiTnissioiior of I-'isherics.] 



No. XXIX.— A REVISION OF THE ORDER IIETEROMI, DEEP-SEA FISHES, 

 WITH A DESCRIPTION OF THE NEW GENERIC TYPES MACDONALDIA 

 AND LIPOGENYS. 



Bv Ct. Buown (rOODK aiid Tarleton IT. Bkax. 



[ A bri(l<;<'<l from advance shrets of Ocpanic Ichthi/olorj)/.] 



The collection of liet(;roinous fishes obtained by the U. S. Fish Com- 

 mission includes representatives of three of the live known genera of 

 the order. Tlie first species was taken in 1880 by a New England fish- 

 ing- vessel from the stomach of a ground shark on the Grand Bank of 

 Newfoundland. The Albatross secured its first specimen (a Macdon- 

 al(Ua) in 1884 off the coast of New Jersej^, and again, in 1887, dredged 

 a second specimen of the same species in nearly the same locality. 



In 188C this vessel collected several examples of Noiacanthns analis 

 west of the Bermudas, and in 1887 Lipofjeni/s was dredged off the ]Mary- 

 land coast. 



Ileteromi have been recorded fr(»m the Arctic, the Mediterranean, 

 north and south Atlantic, and north and soiitli Pacilic, in dci»tlis rang- 

 ing from 100 to upward of 1,800 fathoms. 



Order HETEROMI. 



Xotacanthi, Bi.kkkkr, Tentiinion, 1859, xxiii. (In part.) 

 Hcteromi, Gill, American Naturalist, November, 1889, |). 1016. 



Teleosts with the scapular arch formed by the proscapula and post 

 temporal (or posterotemi)oral), the latter detached from the sides of 

 the cranium, and impinging on the supraoccipital ; the hypercoracoid 

 and hypocoracoid coalesced into a single lamellar imperforate plate; 

 the actinosts normal; the cranium with the condyle <-ontined to the 

 basioccipital (ill defined); the exoccipitals coalesced with the epiotics 

 and opisthotics; the vonieiol)solete; the opercular apparatus complete, 

 but the preoperculum slightly connected with or discrete from tlie siis- 

 pensorium; the suborbitals suppressed; the jaw bones complete and 

 little aberrant; the palatines, entopterygoids, and ectoptyergoids well 

 developed ; the anterior vertebra? separate, and the ventrals abdomi- 

 nal (Gill.) 



Pioceediiigw of tlie U. S. National Museum, Vol. XVII— Ko. lOl.'i. 



4.5.3 



