390 Rev. R. T. Lowe on the Respiratory Organs, &c. 
My object in these additional remarks is not at present entirely to re- 
nounce all my former inferences; but only to guard other enquirers, by 
explaining more clearly and distinctly the exact extent, to which, in the 
present state of the matter, those conclusions may be safely and legiti- 
mately received. 
I have been led to reconsider and thus to recapitulate this matter, 
from some anatomical observations, made by my friend the Reverend 
M, J. Berkeley, on the nature, or structure, of the respiratory organs in 
Voluta denticulata, Mont. These he is inclined to consider of the same 
nature as those of the Limneide. Iam not in any way disposed to 
impugn the correctness of these observations; nor to shelfer myself be- 
hind considerations of the difficulty of obtaining by the scalpel correct 
ideas in objects so minute and difficult of examination as these. To the 
authour of the investigation of the anatomy of Cyclostoma, in this Journal, 
apart from all private sources of the fullest confidence in his skill and 
ability, the most implicit dependence may be paid, in points such as 
these; however baffling they may have proved to the researches of my- 
self and others, conducted on the same plan. But granting the complete 
establishment of the fact, by any means of investigation, viz. that the re- 
spiratory organs of Vol, denticulata, Mont. are not branchial, 1. e. pec- 
tinated ; I am not therefore authorized to conclude finally, though I may 
be led to suspect, that those of Pedipes, Truncatella and Melampus are 
also not so. In my former paper, I have myself introduced this shell, 
not without considerable hesitation on other grounds, into association 
with my Melampodes, in the absence of all accurate knowledge of the 
animal as to the point in question. I cannot therefore at present admit 
this instance to be of sufficient weight to invalidate peremptorily all the 
inferences in question; though it is certainly well worth consideration, 
and a most interesting discovery in itself. 
i eh 
Madera, March 20th, 1833. 
