98 University of California Publications in Zoology. [Vol.6 



ABBREVIATIONS USED IN TIIK PLATES. 



(/, a', a" — axes of tentacle and pri- 

 mary and secondary branches, 

 respectively. 



a. Ic. s.- ampuli f lacteal system. 



at. — atrial chamber. 



&', b", h' " — primary, secondary, 

 and teritiary tentacle bra aches. 



br. f. — branchial folds. 



br. s. — branchial sac. 



(/. /. — dorsal Ianguets. 



(/. V. — supernumerary Ianguets. 



e. — esophagus. 



i ml. — endostyle, 



(/'. 11". g' " — primary, secondary, 

 tertiary generations of tentacle 

 branches. 



i/nii. J ami 5 — male ami female 



gonads. 

 int. — intestine, 

 /.—liver. 



It: .v.— lacteal system. 

 ;. ('.—liver duet. 



long. s. — longitudinal sinuses of 

 branchial sac. 



in. mux. — mantle musculature. 



(i. /. — opening of liver duet. 



st. — stomach. 



st. /'. — stomach fold. 



s 1 , s 1 , s 2 , s*, s B , s° — transverse sinuses 

 of the several orders. 



