98 POLYCH^ETA OF THE FAMILIES SERPULlDvE AND SABELLID^E. 



EXPLANATION OF THE PLATE. 



Fi^. 1. Serpiila cermicularis L. Collar-setre from a single specimen to show variation: la, with the 

 nnrmul two processes at base of blade ; I/', with four nearly eijual processes, x 300. 



Fi'_'. 2. Apoinatas brownii n. sp. 2a, collar-seta; 26, bladed sickle from thorax; 2'-, sickle-shaped seta 

 from abdomen ; 2</, thoracic uncinus ; 2e, abdominal uucinus. x 375. 



Fig. 3. Spirorbis antar<-ti<:us n. sp. 3a, tube with three small ones towards its centre, x!2; 3b, 

 operculum, x 48 ; 3c, cullar-seta, x 375. 



Fi. 4. Sfirurliis patagonicus Caullery and Mesnil. Collar-seta, x 375. 



Fig. 5. Spirorbis falMan dints n. sp. 5a, operculum of young specimen, x 36 ; 56, collar-seta, x 375 ; 

 5i; seta of bladed sickle type, from third thoracic fascicle, x 375. 



Fig. 6. Eurato melanostigma (Sehmarda). 6 and 66, thoracic setae, x 220 ; 6f, thoracic crotchet, 

 x220. 



Fig. 7. Potanris scotix n. sp. 7, thoracic avicular crotchet, x 48 ; 76, head of same, x 220 ; 7 c, thoracic 

 pennoned seta, x 48 ; 7(7, head of same, x 220 ; 7e, abdominal avicular crotchet, x220; If, abdominal 

 lanceolate seta, x 150; 7g, superior thoracic seta, x 150; 7h, inferior thoracic seta, x 150. 



(ROY. soc. EDIN. TRANS., VOL. XLIX., 358.) 



