138 LIVERPOOL BIOLOGICAL SOCIETY. 



with gland cells amongst which are found one or more 

 small cavities. 



Vayssiere * has described in Doto cinerea, and briefly 

 referred to in D. coronata, the presence of remarkable large 

 miicellular glands on the papillae of the cerata which he con- 

 siders as offensive organs comparable with the cnidocysts 

 of the Eolididae. Yayssiere finds that these cells when 

 mature are able on slight pressure to emit a delicate tube 

 filled with a finely granular fluid, which escapes from a slit 

 in the end of the tube, and may be regarded as a poison 

 serving to defend the Doto against enemies.! 



Our figures (PI. IX. figs. 2, 3 and 4) are of course taken 

 from preserved specimens, where no doubt there has been 

 a certain amount of contraction, but the sections certainly 

 give us the impression that the large cells are arranged 

 in distinct masses or glands containing a central cavity 

 (PI. IX. figs. 2 and 4) and opening to the exterior at the 

 apex of the little papilla where the epithelium becomes low. 

 From Vayssiere' s figure I it appears that in Doto cinerea 

 the epithelium remains columnar all over the summit of 

 the papilla. We do not find in our specimens any trace 

 of the ''urticating cells" filled with minute fusiform 

 spicules found by Vayssiere in Doto cinerea. 



Family Eolidid^. 



Facelina {Acanthopsole) coronata, Forbes. 



We find that in this species, which we have been inves- 

 tigating since the last report, the apex of the hepatic 

 caecum in the cerata is connected with the cnidophorous 

 sac by a long narrow tube very much as in Facelina 

 drummondi (see PI. IX. fig. 8). The cnidophorous sac 



* Ann. du Mus. d'Hist. Nat. de Marseille, t. iii., mem. 4, p. 104, 1888. 

 tloc. cit., p. 105. Jloc. cit., \)\. vii. fig. 133. 



