SIR C. F.T.IOT : ON A REMARKABLE NUDIBRANCTT. 165 



which he regards as a connecting link between the Dorididse and 

 Tritoniidse. It possesses the following characteristics : a Doris-like 

 shape, with ample pallial margin and narrowish foot; no projecting 

 sheaths to rhinophores ; strong jaws, and a multiseriate radula with 

 central tooth ; no gills of any kind ; a lateral anus, a blood gland, and 

 two sperm athecas. The British Museum specimen certainly does not 

 belong to the same genus, but it appears to form another link between 

 the Dorididoe and Tritoniidae. It agrees with Doridoxa in the absence 

 of gills, appendages, and rhinophore sheaths, and in the rounded shape 

 of the back. But the narrow pallial margin, the height of the body, 

 and the absence of a blood gland and of a second spermatheca, are 

 characters which approximate it to Tritonia. I should say, however, 

 that, though I was unable to discover the two last-named organs, the 

 interior of the animal was not well preserved, and their non-existence 

 cannot be regarded as certain. 



It is much to be desired that naturalists in British Columbia and 

 Alaska should endeavour to obtain further specimens of the mollusc 

 dredged by Mr. Keen, because its peculiarities, if not teratological, are 

 sufficient to constitute a new and remarkable genus. 



