ALA 



THY 



OBE 



ALB 



ATL 



TON 



TON 



FiGiRE 10. — Anterior view, first closed hiipiual arch and pre- 

 ceding vertebrae of Thinwus species. ALA — vertebrae 0- 

 10, ALR— 9-11, ATL— 9-11, NL\C— 8-10, OBI<:-Ml (the 

 one slightly below the main row shows shape of first 

 closed haemal arch when located on 10th vertebrae), 

 THY— 8-10, TON— 9-11. 



FiGi'RE 11. — Left lateral view of vertebrae of Thmiiius species 

 .showing first ventrally directed parapophyses (left verte- 

 bra) and first clo.sed haemal arch (right vertebra). ALA — 

 vertebrae 9-10, ALB— 9-11, ATL— 9-11, OBE— 9-11, 

 THY— 8-10, TON— 10-12. 



78 



U.S. FISH AND WILDLIFE SKKVICK 



