BRITISH NUDIBRANCHIATE MOLLUSCA. iii 



"On the 17th February, 1840, I procured three specimens of this Doris among oysters 

 brought to Belfast Market from the neighbouring coast of Down or Antrim." W. Thompson. 



The above description, drawn up by ourselves from the specimens in spirits, with the 

 addition of Mr. Thompson's notes from the living animal, was published in the ' Annals of 

 Natural History' for May, 1845. The species comes very near to D. diaphana, from which it 

 differs a little in colour, in being rather more elongated, in having a larger veil, and more 

 especially in the size of the liver, that of D. diaphana being larger, blacker, and reaching 

 further forward in the body than in this species. The mouth too is larger, and is almost in 

 the centre of the veil. 



(6) Doris PUSILLA. 



Mr. George Murray informs us that he has got two specimens of this Boris at Burghead, 

 on the coast of Elgin. 



(7) Doris subquadrata. 



A specimen of this rare species was got at Hilbre Island, Mouth of the Dee, in April, 

 1851, by Mr. I. Byerley, of Upton, Birkenhead. 



(8) tEgirus punctilucens. 



A young individual of this species has been got at Burghead, Elgin, by Mr. Murray ; 

 the only one yet found on the eastern coast of Britain. 



(9) Thecacera pennigera. 



Doris pennigera, Mont., in Linn. Trans., v. 11, p. 17, pi. 4, fig. 5. 



" Body oblong, acuminated almost to a point at the posterior extremity, covered with 

 small spots of bright orange and black on all the upper parts ; the black markings are smallest, 

 and appear radiated under a lens : the anterior end is sub-bifid, extending each side into an 

 angular lobe : tentacula two, sub-clavated and perfoliated ; these originate on the upper par 

 some distance from the anterior end, and each is nearly surrounded by a sort of bipartite wing; 

 the vent is on the back, furnished with five branched appendages that partly surround it on 

 the fore part, and two large bifid peduncles behind. Length half an inch. 



" One specimen only of this singular and gaudy animal has occurred : it was taken at 

 low-water on the rocks at Milton." Montagu, loc. oil. 



While these sheets are going through the press, and since the Synopsis was printed off, 

 we have obtained a specimen of this interesting species, through the kindness of Mr. W. 

 Thompson, of Weymouth, which has enabled us to give figures of it in an additional plate. 

 (Fam. I, Plate 21 a.) 



