122 AUSTRALASIAN ANTARCTIC EXPEDITION. 



Lecena arenilega (figs. 95, 96). 



Fig. 95. Anterior eiid from above (enlarged); most of the tentacles are omitted; a 

 few are shown cut short. 

 96. Anterior end from below. 



Scione mirabilis (figs. 97-100). 

 Fig. 97. Anterior end, from the side (enlarged), showing the contracted gill, as described 

 for S. spinifera. 



98. Aiiterior end of another specimen (a female) with gill extended, as in Mcintosh's 

 figure. This was removed from its tube in which it had been preserved. 



99. Uncinus from a posterior segment (X 360). 



100. Uncinus viewed from above : (a) one of the upper ones; (6) one of the lower 

 ones. 



Polycirrus Immiltoni (figs. 101-106). 



Fig. 101. Ventral view of anterior end. Note the nephi'idial papillse below the notopods. 



102. The 13th parapod, with contained eggs ( x 90). 



103. Notopodial capUliform cha^ta, with unsymmetrical flange ( X 720). 



104. Notopodial capilliform cheeta, the slender denticulated form ( X 720). 



105. Uncinus (x 720). 



106. Uncinus from above (freehand) to show the "hood" above the teeth. 



Plate 10. 

 PkyUocomus dihranchiata (figs. 107-123). 

 Fig. 107. Entu-e worm in outline ; natural size. 



108. The anterior end from in front (enlarged) — hr., branchiferous segment ; pe., 

 peristomium ; pr., prostomial plate ; x., nuchal organ. 



109. Anterior end from the right side. Letters as above. 



110. Ajiterior end, dorsal view of left side— gr., insertion of gill. 



111. Transverse section of gill, showing axis and the four lamellse. 



112. Transverse section of a gill-folium (x 45). The blood-vessels cut through are 

 indicated by the rows of black ovals. 



1 13. Anterior end ventral view — /. , group of pigment spots ; 3. , the first cha^tigerous 

 segment. Other letters as above. 



114. Dorsal view of the junction of thorax {th.), and abdomen [ah. 1) ( X 8). 



115. Posterior end, side view ( X 5). 



116. The tentacles displayed within the- buccal cavity by slitting the body wall 

 along the dotted lines shown in fig. 113— w., the membrane surrounding the 

 base of the tentacles. 



117. A portion of the peritentacular membrane with the tentacles turned forwards, 

 showing the proximal and distal rows of pigment spots^ 



