Classijication of ihc Order Zcoinorj>hi. 483 



ZeuH a|)|)oftr8 to date from the Oli^occno, and the name 

 Ci/t(-)i(les has hceu givon to an Oligocene fish of this family. 



Stalks has {^iven a j;oo<l account of the ostcolopy of Zfu.i 

 (rroc. U.S. Nat. Mus. xxi. lSy«) an<l Shuftddt has de.scrih(.-d 

 the skeh'toii of the unifjue Hpicimen of Granvnicolepis 

 (Journ. Morph. ii. 1889). I have examined skeh'tons of 

 Ztus^ Ci/ltii.t, aud yeoci/ttus ; the htst two differ from Zeus 

 and .rcscmhle Gravtmicvlei>is in the presence of a basisphcnoid, 

 and in the greater prominence of the supraoccipital, which 

 Hepaiates the parietals. In Zius and Cyttua there are 31 or 

 32 vertebra} and the downwardly directed j^arapophyscs of 

 the posterior prrocaudals unite to form closed hicmal arches; 

 in JS'eoci/ttus, which has 40 vertebrae, the parapophyscs are 

 somewhat divergent and only the last three pairs arc britlged 

 across, whilst Grdviiiiicvhpis, with 4G vcrtebrie, seems to 

 have a like structure. 



JS'eocyitus is very similar to Grammicolepis in cranial 

 osteology, and comparison of the skeleton of the former with 

 Shufeldt's figures ot tiie latter shows that tho 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 

 Shufcldt 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 ; 

 |i8eudobranchife present. 22 vertebra?. Caudal fin with 12 

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

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



Subfamily 1. Antiooniinjb. 



Mouth moderately protiactile ; praimaxillary processes 

 oiily just reaching the frontals; maxillary broad, bearing a 

 large supramaxillary ; no subucular shelf. Spinous dorsal 

 shorter than the soft-rayed fin. 



The skeleton of the single genus Antif/onia, Lowe, has 

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

 1902), wiio has, liowever, overlooked one leature of im- 

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



