350 APPENDIX. 



Colour. 



Column. Exposed part pellucid white, with the warts opaque white. 



Epidermis. Ochreous drab, slightly darker in some parts, with longi- 

 tudinal white lines proceeding from the base, and vanishing a little way 

 up. Central star of button formed of alternate whitish and blackish rays. 



Disk. Drab : each primary and secondary radius marked with two 

 parallel lines of dark chocolate-brown ; each tertiary radius is similarly but 

 more faintly marked, and the space inclosed is in these latter radii drab 

 on their outer and white on their inner moiety, the divisions of the two 

 colours beiug marked by a black spot. The space immediately bounding 

 the foot of each primary tentacle dark brown. 



Tentacles. Pellucid whitish ; the lower half opaque white on the front, 

 crossed by four transverse bars of dusky, the whole (except the lowest one) 

 beiug connected by three longitudinal lines of the same colour, which 

 impart a latticed or window-like pattern to the tentacle. 



Mouth. Lip white ; throat white, with black furrows. 



Size. 



Diameter of base nearly an inch, of extended column half an inch, of 

 flower from one-third of an inch to an inch ; height one inch. 



Locality. 

 Lundy Island : on rocks at low water. 



My acquaintance with this species I owe to the courtesy 

 of William Brodrick, Esq., of Ilfracombe, with whose 

 name I have honoured it. He kindly sent me a specimen 

 in November, 1858, which had at that time been in his 

 possession about sixteen months, having been taken with 

 another individual in the summer of 1857. Its habit is to 

 remain on an exposed stone, without any disposition to 

 roam : it is generally closed by day, or if open the column 

 is contracted ; but it elongates in darkness. It is very 

 timid, and cannot on this account be fed : the slightest 

 touch of the tentacles I found to be followed by an instant 

 closing. The light of a candle, concentrated by a lens, 

 presently causes it to shrink and contract 



gausapata. 

 Brodhicit. 

 troglodytes. 



