4 Mr. C. T. Regan on the Anatomy and 



In addition to the recent PoJymixia, Lowe, the Cretaceous 

 Platycormus, W. von der Marck, may be placed in this 

 family; it lias been well described and figured, and shows 

 many important resemblances to the recent genus. The less 

 satisfactorily known Omosoma, Costa, atid Pycnosterinx, 

 Heck., may be provisionally associated with Platycormus. 



Family 2. Berycopsidae. 



Berycopsis elegans, Dixon, from the Chalk of Sussex and 

 Kent, has been' fully described and figured by Dr. Smith 

 Woodward. It is in some respects intermediate between the 

 Polymixiidse and Berycidse, but is well distinguished from 

 both. 



Dorsal and anal fins as in the Polymixiidse; pelvic fins not 

 well known, perhaps as in the Polymixiidse; two supra- 

 maxillaries formed as in Beryx^ the posterior large and 

 sending forward a pointed process above the anterior ; ptery- 

 goid teeth present ; occipital and parietal crests terminating 

 above the middle of the orbit ; suborbitals narrow, prajorbital 

 deep, and maxillary exposed ; vertebra at least 26 and per- 

 haps as many as 30. 



Family 3. Berycidae. 



Dorsal and anal with a few graduated spines ; caudal with 

 17 branched rays; pelvics thoracic, of a spine and 7 to 13 

 soft rays. Jaws with villiform teeth in bands ; teeth on 

 vomer and palatines. Upper edge of maxillary slipping 

 under pr^orbital and anterior suborbitals ; two supra- 

 maxillaries, the posterior sending forward a pointed process 

 above the anterior; subocular shelf formed by several sub- 

 orbitals, or at least extending the whole length of the second ; 

 nasals moderately large, separated by the prseraaxillary pro- 

 cesses, but nearly meeting above them anteriorly ; supra- 

 occipital and parietals not overlapped by the frontals, with 

 prominent crests which extend forward on the latter to the 

 interorbital region ; frontals anteriorly with prominent 

 ridges bordering mucus cavities ; alisphenoids united by 

 suture. Hypocoracoids not narrowed forward, reaching the 

 ventral profile and forming a symphysis behind that of the 

 cleithra; pelvic bones emlDraced by the hypocoracoids and 

 attached to the cleithra above the symphysis. Vertebrse 24; 

 no upturned centra, and the anterior uroneural ankylosed with 

 the last centrum. 



There are two very distinct genera, viz., Beryx, Cuv., and 

 Hoplopteryx, Agass. The former, with species from the 



