636 SIR c. ELiGT OX NUDiBRANCHS [June 19 



1 On the Nudibranchs of Southern India and Ceylon, with 

 special reference to the Drawings by Kelaart and the 

 Collections belonging to Alder and Hancock preserved 

 in the Hancock Museum at Newcastle- on -Tyne. By 

 Sir Charles Eliot, K.C.M.G., F.Z.S., Vice-Chancellor 

 of the University of Sheffield. 



[Received May 19, 1906.] 



(Plates XLII.-XLVIT.*) 



The present paper is mainly an attempt to settle the synonymy 

 of various Nudibranchiata of the Indo- Pacific with the help of 

 material preserved in "the Hancock Museum at Newcastle-on- 

 Tyne. The genus Doriopsilla is discussed, and some new inform- 

 ation as to the anatomy of several species (pai-ticularly Flatydoris 

 formosa, PI. papillata, Doriopsilla miniata, Kalinga ornata, and 

 several Pleurophyllidiidse) is also given. 



The material preserved at Newcastle, and kindly placed at my 

 disposal by the authorities of the Museum, is of two kinds, 

 collections and di-awings. The oriental collections of Alder 

 and Hancock appear to consist of three separate consignments 

 sent fi'om India. They are not kept separately, but can be 

 distinguished. 



(a) The collection made by Walter Elliot near Yizagapatam in 

 1853-4, and described by Alder and Hancock in the ' Transactions ' 

 of the Zoological Society for 1864, pp. 113-147. This collection 

 contains an almost complete series of Alder and Hancock's types, 

 all duly labelled ; but, most unfortunately, many of them have 

 heen allowed to dry up entirely, and nothing whatever can be said 

 of either their anatomy or their external appearance. In some 

 cases it has been possible to extract the buccal parts from these 

 dried morsels, but when there were only one or two specimens it 

 was found that they had been already dissected by Alder and 

 Hancock. The collection of " Diphyllidiada?, Pleurobranchidse, 

 Bullidse, and Aplysiadse," mentioned by Alder and Hancock in 

 the first paragraph of their paper, is also preserved, and the 

 Pleurophjdlidiidpe ( = Diphylliad8e) are noticed below. The hard- 

 ness of the animals and the distinctness of the buccal characters 

 make it possible to identify them. They were not named by 

 Alder and Hancock. 



Even the specimens which have not become dry are in poor 

 condition, which is hardly surprising since they are more than 

 fifty years old. But many of them have jDreserved their external 

 appearance fairly Avell, and the hard parts, such as the teeth, arma- 

 ture of the genitalia and of the labial cuticle, &c., are uninjured. 

 The ribbon of the radula, however, is generally decayed, so that 

 the arrangement of the teeth is disturbed. 



(b) A few specimens collected by Kelaart are sufficiently well 

 preserved to repay examination, but, as in the previous collection, 



* For explanation of the Plates, see p. 690. 



