THE ORDERS OF TELEOSTOMOUS FISHES 487 



Order 2. Salmopercae Jordan and Evermann 



Fam. Percopsidae 

 Order 3. Synentognanthi Gill 



Fam. Belonidse 

 " Exoccetidae 



Superorder Mesichthyes {Hay) (cont'd). 

 (Plate XXIX.) 



Order 1. Haplomi 1 (Gill) Boulenger 



The superfamily Aulopoidea (Iniomi 2 ) , represented by a few 

 shore species and many deep-sea forms, combine characters of 

 the Salmonoid Isospondyli and of the Haplomi. In so far as 

 the osteology is known they differ from the Isospondyli in the 

 absence of the mesocoracoid arch in the shoulder girdle and of the 

 orbitosphenoid in the skull and thus the group falls within 

 Boulenger's definition of the Haplomi; while on account of the 

 close relationship of the Alepidosauridae to the more generalized 

 Enchodontidae of the Cretaceous Smith Woodward includes 

 them all in the Isospondyli. In the Scopelidae, the posttemporal 

 is forked and (as in the Salmonidae, Clupeidae) the upper branch 

 meets the epiotic, the lower the opisthotic, but here, not as in 

 the Isospondyli, the posttemporal merely touches and is not 

 firmly attached to the skull. In the Alepidosauridae the upper 

 branch of the supratemporal is lacking, the simple supratemporal 

 being attached on the side of the occiput to the opisthotic. To 

 this peculiar mode of attachment of the shoulder girdle to the 

 skull at the nape the word Iniomi alludes. As in other Haplomi 

 and progressive Isospondyli the supraoccipital has thrust aside 

 the parietals to gain contact with the frontals, and sometimes, 

 as in the Salmonidae, is itself partly overlapped by the parietals. 

 The most primitive genera (Aulops, Chlorophthalmus) retain the 

 Salmonoid adipose dorsal, a normal maxillary (fide Jordan) 

 and show no luminous spots. In the more specialized genera 



1 a7rA.ovs, simple, w/aos, shoulder, iri allusion to the want of the meso- 

 coracoid. 



2 Ivlov, nape, w/aos, shoulder. 



