64 ADDITION TO MR. HODGH’S PAPER. 
ADDITION TO MR. HODGE’S PAPER ON THE BRITTLE STAR. 
Since the foregoing was in print, I have subsequently been 
informed by the Rev. Alfred M. Norman, that Mr. C. W. Peach, 
of Wick, had some time ago noticed “ hooks,” on Ophiocoma rosula: 
on searching for his observations, I found them in the “ Proceed- 
ings of the Royal Physical Society, in Edinburgh New Philo- 
sophical Journal for 1859.” 
In recording his observations he says: “I have seen these 
jawlike spines (hooks) on specimens in all stages of growth.” 
This seems contrary to my remarks, but on again going over 
several specimens, both young and mature, I am fully convinced 
that these hooks are merely the transition stages of true spines, 
which may frequently be seen on those parts of the rays which 
have been recently produced, no such hooks being visible on 
the old portions of the rays; in this case, the hooks have 
been modified by further deposits into the blunt stout spines, 
seen on the under side. It seems highly probable that this 
method of growth will, under certain variations, be of frequent 
occurrence. 
To Mr. Peach, therefore, is due the credit of being the first to 
notice these hooks, although there he appears to have stopped, 
and, so far as I can learn, the transformation of the hooks into 
spines is now for the first time made known. G. H. 
SEAHAM Harsour, 18th July, 1861. 
