PLATE I. 



FIGS. 1, 4, 7. Terranova antarctica. 



,, -!, 5, (S. Kathlrena scotti. 



,, 3, 6, 9. Leptosomatum sehmtnii. 



FIG. 1. Terranova antarctica, Leiper and Atkinson ; ex Mtmtelus antarcticus. Anterior portion .showing 

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



FIG. '2. Knthleena scotti, Leiper and Atkinson ; ex Diomedea melanophrys. Anterior portion showing 

 a, (Esophagus, with I, posterior appendage, and c, the caeoal prolongation of the intestine. 



FKI. 3. Leptosomatum setosum, v. Linst. Anterior end, showing ti, cephalic armature; b, oesophagus: 

 <, ocelli ; <1, nerve-ring. 



FIG. 4. Terranooa antun-tica. Posterior end of female, it, anus. 



FIG. 5. Kathleena scutti. Posterior extremity of male, showing KJJ., spicules. The papillae are illustrated 

 in text-tig. 1. 



FIG. 6. Leptosomatum ttctunum. Posterior end of male showing four papillae, p., and the peculiar spicules, 

 sp., accessory piece, trft., and sucker, x. 



FIG. 7. Ti'i'i'iinni-ii xittnrctii-a. Anterior end, showing outline of the lips. Interlabia are absent. 



FIG. 8. KntJih'i"iin. xciit/i. Anterior end, showing the lips, a, a', a" , from the ventral aspect. There is 

 a large iiiterlabium, li, separating the two ventral lips, a, <i". The other two are not visible 

 in this position. 



FIG. 9. Leptosomatwm sctnkui/t. Head, showing a, cephalic armature in optical section, and b, cuticular 

 spines. 



