1000 SIR C. ELIOT ON THE NUDIBRAXCHS [Dec. 11,. 



slides which for some reason (generally the disappearance of the- 

 labelled specimen) conld not be referred with certainty to a 

 specific name, nor of those (e. g. Madrella^ Phyllohranchus, 

 Kalivga) which if described would add nothing to already 

 published accounts. 



The slides though very neat are not always of the kind most 

 helpful for studying tiie details of dentition. Often all the teeth 

 are preserved in sittt and none are isolated, so that it is difficult 

 to distinguish the exact form, and esjiecially to see any denticles 

 which may be present on the innermost or outermost teeth. 

 Several rows at least are commonly in confusion, and hence the 

 formulfe are given as approximate. A wide rhachis is unusually 

 frequent and may in some cases be the result of artificial stretching. 

 The medium in which the radulse are mounted has in several 

 instances become an opaque gum which impedes investigation,, 

 but I have not felt at libei-ty to I'emount the objects. 



But in spite of these difliculties there can be little doubt of the 

 general character of the radulse, and the results obtained from 

 their study may be tabulated as follows : — 



Hexabranchus marginatus (Q. & G.) = Doris gloriosa Kelaart. 



Chroniodoris gleniei (Kelaai't). The reference of this form to 

 the genus Chromodoris is confirmed. It is possibly the same as 

 Chr. cavce, and if so the name gleniei has priority. 



Casella maccarthyi (Kelaart) = C. cincta Bgh. 



Hcdgerda apiculata (A. & H.)=^Halge7'da ptmctata Farran, in all 

 probability. 



Boris iDicta Kelaart is probably a Platydoris. 



Doris exanthemata Kelaart is perhaps Asteronotus heviprichi, 

 and in any case nearly allied to it. But the genitalia are 

 unknown. 



Discodoris concinna (A. & H.) = Disc, concinniformis Bgh. 



Staurodoris rusticata (A. & H.). So far as the external 

 characters and buccal parts can decide the matter, the refei'ence 

 of the form to this genus seems certain. 



Thordisa villosa (A. & H.) = Th. maculigera Bgh. 



Herria militaris (A. & H.) = Eolis militaris A. & H. 



Doris spo7igiosa and D. tristis are probably referable to the 

 genus Tripjja, and the former is perhaps identical with both 

 T. areolata and T. onephitica. But it is not known if either form 

 has ptyaline glands. 



Some details are giA'en of the buccal parts of Chromodoris 

 zebriria, Platydoris foronosa, PI. ellioti, PI. striata, Discodoris 

 fragilis, Disc, pardalis, Goniodoris asj^rsa, G. citrina, Trevelyana 

 ceylonica. 



In the above statement the first name given is that by which 



