324 CEYLON PEARL OYSTER REPORT. 



Fig. 174. Ewrato notata. Thoracic uncinus. Z. 3 D. 

 ,, 175. Thoracic capillary, broadly limbate seta. Z. 3 D. 



176. Thoracic capillary seta with the shaft broken and the limbus projecting. 



177. Sabellastark indica. Thoracic uncinus. Z. 3 C. 

 177. ,, Frontal view of cephalic crown; rf., dorsal side; /., antenna or tentacular 



lacinia. 



,, 178. Jasmineira cadudhranchiata. Thoracic rostrate uncinus. Z. 3 C. 

 ,, 179. Abdominal uncinus. Z. 3 D. 



180. Enpomatus aibirepn. Operculum in side view. 

 180. ,, Dorsal view of operculum. 



181. Bayonet seta from first thoracic fascicle. 



182. Enpniititliix rsaltutiix. Oblique lateral view of operculum. 



183. Protulopsis paUiata. Salmacine seta from fourth thoracic fascicle. 

 ,,184. ,, Base of uncinus. 



,, 185. Abdominal seta. 



,, 186. Serpula granulosa. View of orifice of tube with operculum in situ. 

 186a. ,, Operculum bisected. 



,, 187 Serpula watsoni, Uncinus from last thoracic torus. Z. 3 D. 



,, 188. Spirdbranch/as cervicornis. Cephalic crown in dorsal view: c, collar flap turned aside. 

 ,, 1S9. ,, Cephalic crown obliquely from below. 



,, 190. ,, One of the opercular horns in side view. 



,, 191. ,, Bayonet seta from buccal segment. 



192. Base of uncinus in side view and in frontal view. 



193. Spiivbranrhus semperi, var. aeroceros. Operculum from below. 

 ,, 194. Vermilia pygidialis. Anterior region from dorsal side. 



,, 195. Uncinus from last thoracic torus. 



,, 196. ,, Posterior end. 



197. Leprea inversa. Posterior abdominal uncinus. Z. 3 J. water imm. From one of the last three 

 or four segments. 



PLATE VIII. 



The figures on this plate were drawn by Mr. Arnold T. Watson, to whom the identification of the 

 " building organs " of Palladia pennata is due. 



Fig. 1. Pailasia pennata. Side view of anterior region. /., retracted tentacles; 6, white portion of 

 peristome; c, brown portion; </, brown with white zebra-like stripes, x 19. a, internal 

 bristles crossing when head contracts. 



,, 2. Pailasia pennata. Ventral view of anterior region ; b.o., building organ, x 19. 



,, 3. Pomatostegus actmoceros. Ventral view; op.c, opercular cavity; .., thoracic orifice, x 1G. 



,, 4. ,, Dorsal view, x 16. 



5. Stylarioides parmatus. Showing recurved abdomen; the fore-body is seen from below, x 17. 

 a, uncini. 



,, 6. Serpula watsoni. Operculum, x 18. 



