376 EDWARD S. MORSE ON 



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Explanation of Plates, 

 abbreviations used. 



a. — anus. b. — brachia. 



a. b. 1. — anterior branch of lateral sinus. b. f . — brachial fold. 



a. cl. — anterior cluster of setae. b. g. — brachial groove. 



a. f. — anterior folds of pallium. b. g. m. — brachial groove muscles. 



a. h. — accessory "hearts of Hancock." b. 1. — border lip of pallium. 



ap. — aponeurosis of muscle of main pallial sinus opening. b. p. — border of pallium, 



a. p. s. — anterior pallial sinus. b. 8. —brachial sinus. 



az. — azygos process. c. — collar. 



