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 J). coronata, the presence of remarkable large 
unicellular glands on the papillee of the cerata which he con- 
siders as offensive organs comparable with the cnidocysts 
of the Holidide. Vayssiere finds that these cells when 
mature are able on sheht 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. t 
Our figures (Pl. 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 
elve us the impression that the large cells are arranged 
in distinct masses or glands containing a central cavity 
(Pl. 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 [ 1t 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 Honipipa. 
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 
ceecum in the cerata 1s connected with the cnidophorous 
sac by a long narrow tube very much as in Lacelina 
drummondi (see Pl. IX. fig. 8). The cnidophorous sac 
* Ann. du Mus. d’Hist. Nat. de Marseille, t. iii., mem. 4, p. 104, 1888. 
T loc. cit., p. 105. floc. cit., pl. vii. fig. 133. 
