130 



Ml-. C. T. Regan on the Aaalomy and 



Family 1. Scopelarchidse. 



Snout short. Maxillary with a small anterior expansion ; 

 a supiamaxillary ; canines slender, barbed, forming a regular 

 series in the lower jaw. Skull considerably expanded behind 

 the narrow interorbital region ; parietals meeting above supra- 

 occipital; posterior temporal fossse not roofed ; lateral ethmoids 

 separated by an interspace ; suborbitals ossified. A single 

 laminar postcleithrum ; cleithrum expanded below. 52 ver- 

 tebree; ribs on short processes. Dorsal fin siiort. 



A. Pectoral arch of Evermanella hyalina ; from within. 



B. Pectoral arch of Omosudis loivii ; external view, with the coracoids 



and mdials not exposed. 



ptte, post-temporal ; cl, cleithrum ; scl, supracleithrum ; ^:)e/, pel', post- 

 cleithra ; so, hypercoracoid ; cor, hjpocoracoid ; r, radials ; p, fin- 



} 



Scopelarchus, Alcock, seems to be more primitive than the 

 other genera. As described and figured it has the head, 

 mouth, teeth, &c. of Evermanella, but the dorsal fin is more 

 advanced, there are traces of small scales in addition to the 

 large scales of the lateral line, and tlie eyes, described 

 as having the visual axis superior rather than lateral, are 

 probably not formed as in Evermanella. Neosudis, Casteln., 

 may pertain to this family. In Evermanella, Fowler [Odonto- 

 stomus), and Dissoma, Brauer, the eyes can look upwards 

 or outwards, being lodged in a vertical pocket which is 

 covered externally by a transparent membrane. The skeletal 

 characters given are those of an example of Evermanella 

 hf/ali'na. 



