strong filtration processes which undoubtedly indicate that the genus 

 Eomyctophum belonged to forms feeding on plankton. 



Of considerable interest in these Oligocene forms would be the 

 occurrence of igill lobes, whose presence in the lower part of arch V 

 may be reasonably postulated by reason of the satisfactory state of 

 preservation of the gill arches in specimen 17. Os. An indication of 

 this might be found in the osseous rods — representing the skeleton — 

 present on that part of the arch which probably belongs to gill arch V. 

 No such gill lobes are encountered on arch V in the recent bony 

 fishes. 



Fig, 8. Eomyctophum cf. koraensis Danil., 

 elements of shoulder girdle (after spec- 

 imen 55. Os.). ca X 8 

 cor. coracoideum, ol. oleithrum, 

 pstm,. posttemporale, sprcl. supracleith- 

 rum. 



Only the inner surface of the gill covers can be seen so that 

 a reconstruction of their shape is hardly possible. If not all, at least 

 the operculum, was coated by scales which are preserved as impres- 

 sions over a small fragment in specimens Nos. 70. Os. and 177. Os. The 

 shoulder girdle (Fig. 8) occurs immediately behind the posterior border 

 of the operculum, the cleithrum being its most prominent part. The 

 coracoideimi is the only visible bone of cartilaginous origin. The scapula 



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