Classification of the Order Zeomorphi. 483 



Zeus appears to date from the Oligocene, and the name 

 Cyttoides has been given to an Oligocene fish of this family. 



Starks has given a good account of the osteology of Zeus 

 (Proc. U.S. Nat. Mus. xxi. 1898) and Shufeldt has described 

 the skeleton of the unique specimen of Grammicolepis 

 (Journ. Morph. ii. 1889). I have examined skeletons of 

 Zeus, Cyttus, and Neocyttus ; the last two differ from Zeus 

 and , resemble Grammicolepis in the presence of a basisphenoid, 

 and in the greater prominence of the supraoccipital, which 

 separates the parietals. In Zeus and Cyttus there are 31 or 

 32 vertebrae and the downwardly directed parapophyses of 

 the posterior prsecaudals unite to form closed haemal arches; 

 in Neocyttus, which has 40 vertebrae, the parapophyses are 

 somewhat divergent and only the last three pairs are bridged 

 across, whilst Grammicolepis, with 46 vertebra?, seems to 

 have a like structure. 



JYeocyttus is very similar to Grammicolepis in cranial 

 osteology, and comparison of the skeleton of the former with 

 Shufeldt's figures of the latter shows that the main difference 

 is that in Neocyttus the supraoccipital and parietals are 

 smaller and the frontals larger, with their rugose portions 

 expanded behind and nearly meeting in front of the supra- 

 occipital. Rather large rugose nasal bones are firmly attached 

 on each side to the anterior ends of the frontals and project 

 inwards above the praemaxillary processes; it is evident that 

 Shufeldt has mistaken these for part of the frontals. 



Family 2. Caproidae. 



Anterior trunk-muscles not reaching the frontals, which 

 are rugose ; occipital crest with the upper edge thickened and 

 rugose. 6 branchiostegals ; 4 gills, a slit behind the fourth ; 

 pseudobranchiae present. 22 vertebrae. Caudal fin with 12 

 principal rays, all or 10 of which are branched; 3 anal 

 spines; each pelvic fin of a spine and 5 branched rays. 



Subfamily 1. Antigoniinju. 



Mouth moderately protiactile ; praemaxillary processes 

 only just reaching the frontals ; maxillary broad, bearing a 

 large supramaxillary ; no subocular shelf. Spinous dorsal 

 shorter than the soft-rayed fin. 



The skeleton of the single genus Antigonia, Lowe, has 

 been well described by Starks (Proc. U.S. Nat. Mus. xxv. 

 1902), who has, however, overlooked one feature of im- 

 portance, viz., the firm attachment of the first vertebra to 



