157 



March 4, 1852. 



WILLIAM SPENCE, Esq., V.P., in the Chair. 



In accordance with the Statutes, the following List of Candidates 

 for admission into the Society was read by the Secretary : — ■ 



A paper was read, entitled, " On the Anatomy of Doris." By 

 Albany Hancock, Esq., and Dennis Embleton, M.D., Lecturer on 

 Anatomy and Physiology in the Newcastle-on-Tyne College of Me- 

 dicine, in connection with the University of Durham. Communicated 

 by Professor E. Forbes, F.R.S. Received November 27, 1851. 



The authors have proposed to themselves to describe the anatomy 

 of the three genera typical of the three groups of the Nudibranchiate 

 Mollusca. An account of the structure of Eolis has already appeared 

 in the ' Annals of Natural History.' 



A detailed description is given of the anatomy of Doris, the fol- 

 lowing species of w^hich have been examined, and are referred to in 

 the paper: D. tiibercuIata,Auct., D. iuberculata,'V emny, D.JoJmstoni, 

 D. tomentosa, D. i^epanda, D. coccinea, D. verrucosa, D. pilosa, 

 D. bilamellata, D. aspera, and D. depressa ; but D. tuberciilata of 

 English authors has been taken as the type of the genus, and the 

 standard of comparison for the rest. 



Digestive System,- — The mouth in all the species is a powerful 

 muscular organ, provided with a prehensile tongue beset with siliceous 

 spines, which when the tongue is fully developed, are arranged in a 

 median and two lateral series. Certain species possess, besides, a 

 prehensile spinous collar on the buccal lip, occasionally associated 

 with a rudimentary horny jaw. The mode of development of the 

 lingual spines is shown to be the same as that of the teeth of the 

 Vertebrata. 



The oesophagus varies in length ; in some it is dilated at the top, 



George Appold, Esq. 

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Edward Augustus Inglefield, 



Com. R.N. 



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Hugh Lee Pattinson, Esq. 



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