480 PROCEEDINGS: BOSTON SOCIETY NATURAL HISTORY. 
Text-flg. 7. — Caesira septenlrionalis (Traustedt) . Part Of right side of branchial 
sac. X 9. 
Owing to an injury to that part of the specimen, the dorsal tubercle 
was not clearly seen. (According to Hartmeyer it is always simply 
C-shaped with the opening directed to the left rear.) 
