PLATE I. 



Figs. 1, i, 7. — Terranova antarctica. 

 ,, 2, 5, 8. — Kathleena scotti. 

 ,, 3, 6, 9. — L&ptosomatum setosum. 



Fig. 1. — Terranova antarctica, Leiper and Atkinson ; ex Mustelus antarcticus. Anterior portion showing 

 a, simple oesophagus, and b, caecal prolongation of the intestine. 



Fig. 2. — Kathleena, scotti, Leiper and Atkinson ; ex Diomeclea melanophrys. Anterior portion showing 

 a, oesophagus, with b, posterior appendage, and c, the caecal prolongation of the intestine. 



Fig. 3. — Lejotosomatum setosum, v. Linst. Anterior end, showing a, cephalic armature ; b, oesophagus ; 

 c, ocelli ; d, nerve-ring. 



Fig. 4. — Terranova antarctica. Posterior end of female, a, anus. 



Fig. 5. — Kathleena scotti. Posterior extremity of male, showing sfi., spicules. The pajrillae are illustrated 

 in text-fig. 1. 



Fig. 6. — Lejotosomatum setosum. Posterior end of male showing four papillae, jp., and the peculiar spicules, 

 sja., accessory piece, ajj., and sucker, s. 



Fig. 7. — Terranova antarctica. Anterior end, showing outline of the lips. Interlabia are absent. 



Fig. 8. — Kathleena. scotti. Anterior end, showing the lips, a, a', a", from the ventral aspect. There is 

 a large intei'labium, b, separating the two ventral lips, a, a". The other two are not visible 

 in this position. 



Fig. 9. — Lejotosomatum setosum. Head, showing a, cephalic armature in optical section, and b, cuticular 

 spines. 



