10 Scientific Proceedings, Royal Dublin Society. 



area left between this and the lowest straight line is dark in 

 colour. • A dark ring all round the base of the tentacles. 



4. Disc pale, with a lenticular dark-brown mark in each radius, 

 and external to it at the base of each tentacle a brown line. The 

 six primary tentacles have the lowest half ring, dark in colour, and 

 V-shaped, with a dark spot between the two limbs of the V ; the 

 other lines pale. The six secondary tentacles have pale indistinct 

 markings, the lowermost of which is |\/| -shaped. White external 

 brackets. 



5. Disc pale-buff round mouth, separated from the pale-yellow 

 peripheral portion by a chain of dark-brown lenticular marks, 

 which practically form a ring. At the base of each tentacle is a 

 transverse dark-brown line ; base of tentacle white ; remainder pale- 

 buff, the two colours being separated by a dark M _mar k ; there are 

 also one or two indistinct pale-brown markings. At the base of 

 each tentacle externally there is a lateral dark line, which slightly 

 converges towards its fellow. 



6. Disc pale, with alternate dark (primary radii) and light 

 (secondary radii) lenticular marks. The primary tentacles are very 

 dark ; there is a basal |\/l-mark, with a dark triangular mark a 

 little way above. The external bracket-marks are prominent, and 

 below each is a pair of dark spots. 



7. Disc pale-orange, a white spot opposite each tentacle. Ten- 

 tacles with five pale rings, the lowermost M -shaped. There is a 

 small pale basal mark. The external bracket-marks are very 

 plain. 



8. Disc pale-buff ; an indistinct pale V-mark in the centre of 

 each radius. Tentacles with five pale rings, of which the lower- 

 most is M -shaped. 



One or two other varieties were seen, but a sufficiently careful 

 note of the colour and pattern was not made. 



The variations of the disc and tentacles are so many, that at 

 first sight it seems almost hopeless to give any character which 

 would be of service for specific determination. I have, however, 

 ventured to give a drawing (fig. 3, p. 12) of what I take to be the 

 general pattern of the disc and tentacles. 



The following diagnosis will, I hope, be found to be essentially 

 correct : — 



