NUDIBRANCHIATA OF THE L.M.B.C. DISTRICT. 145 
cerata which are short and stout in form. The hepatic 
ceeca under a low power of the microscope are seen to be 
irregularly speckled with green and black pigment, while 
at the apex the cnidophorous sac forms a large opaque 
yellowish mass. This apical colourimg is not superficial as 
in the case of Coryphella landsburgi, C. rufibranchialis, and 
other species, but is apparently in the wall of the sac itself. 
There is, however, a little opaque white sprinkled down 
the anterior surfaces of the cerata. One of the larger 
cerata was found to be bifurcated at its tip, and provided 
with two distinct cnidophorous sacs. Curiously enough 
the single specimen from Puffin Island, which we recorded 
last year, showed exactly the same abnormality.* 
The cnidophorous sac (Pl. LX. fig. 12) is flask shaped, 
and communicates with the hepatic ceecum by a very short 
tube. Several masses of gland cells (g/.) are placed around 
the junction. 
The table on the following page shows the distribution of 
the species of Nudibranchs recorded up to now in the four 
regions of our district which have been sufficiently investi- 
eated. The first column includes Hilbre Island, while the 
third takes in the Menai Straits and the coast of Anglesey: 
we separate Puffin Island from the preceding region 
merely because it may be convenient for those working 
at the Biological Station to know what species have been 
found on the shore. Fifteen species have now been ob- 
tained at Puttn Island. 
* Proce. Biol. Soc., Liverpool, vol. ii., p. 234. 
