PHILOSOPHICAL TRANSACTIONS 
XIII. On the Anatomy o/” Doris. By Albany Hancock and Dennis Embleton, M.D., 
F.R.C.S.E., Lecturer on Anatomy and Physiology in the Newcastle-upon-Tyne 
College of Medicine in connection with the University of Durham. Communicated 
hy Prof Edward Forbes, F.R.S. 
Received November 27, 1851, — Read March 4, 1852. 
Whilst engaged in arranging the materials for their Monograph on the Nudi- 
branehiate Mollusks now in course of publication by the Ray Society, it became 
evident to Messrs. Alder and Hancock, that not only the external characters, but 
also the internal structure, of this interesting group of animals, should be fully in- 
vestigated. Since then the writers of the following paper have taken up the anato- 
mical part of the subject, and have already been enabled to publish in the ^ Annals of 
Natural History ’ an account of the anatomy of one genus, Eolis ; another genus, 
Doris, forms the subject of the present communication. 
On entering on the present investigation, we were naturally anxious to avail our- 
selves of the stock of knowledge already collected by our predecessors in this walk 
of science. 
Cuvier, the great master of Comparative Anatomy, had dissected and studied the 
genus Doris, and had left a considerable amount of information for those who might 
follow in his steps ; indeed his memoir contains a more complete account of the ana- 
tomy of Doris than any yet published. Within the last few years Herr Heinrich 
Meckel has described the generative organs in Muller’s Archive 1844, and more 
recently Messrs. Milne-Edwards and Blanchard have given accounts of the circu- 
latory and nervous systems of Doris. We will not here dilate upon the works of 
these authors, but shall refer to them in the course of our description of the various 
organs. 
Since the reading of our paper on the subject before us at the Edinburgh Meeting 
of the British Association in 1850, we have gone more fully into the details of the 
anatomy of Doris than it had been in our power up to that time to do, and having 
verified our observations in many particulars, and thrown additional light on our 
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