﻿EXPLANATION OF PLATE XXXVIL 



!n all figures — 



AX. CART. = Axial cartilage 



B. CART. = Basal cartilage. 



D.F.C. = Dorsal fin chambers. 



D.F.R. — Dorsal fin rays. 



ALP. CART. = Median paired cartilages. 



N.C. = Nerve cord. 



N.T. = Notochord. 



R.F. = Rostral fin. 



Fig. I. — Anterior end of A. aiistndis showing rostral fin and 

 notochord slighth' raised. Drawn with the camera 

 lucida. 



Fig. 2.— -Outlines of A. bassa)in)}i and ,1. australis to show 

 proportional widths. Drawn with the camera 

 lucida. Nat. sizes. 



F'&s- 3i 4 'ii"**^ 5- — Bases of the cartilages of the mid-ventral 

 portion of the oral hood in three different specimens 

 of A. aiistfalis to show median ventral unpaired 

 tentacle. 



Figs. 6 and j. — The same in two other specimens with the 

 median ventral unpaired tentacle stunted. 



Figs. 8 to 12. — Bases of the cartilages of the mid-ventral 

 portion of the oral hood in five different specimens 

 of A. basscniii))! to show median paired tentacles. 



Figs. 13, 14 and 15. — Bases of the cartilages of the mid- 

 ventral portion of the oral hood in three other speci- 

 mens of A. basscuui))! showing median unpaired 

 tentacle. 



Fig. 16. — Cartilages of oral cirri of .1. hassanum showing 

 pr)sition of the median ventral pair. 



