o'donoghue : nudibranchiate mollusca. 141 



The latter author describes the colour as " rose-red ", while 

 Cockerell and Eliot picture it as tawny yellow, perhaps sufficiently 

 near to be within the limits of variation . The striking point, however, 

 is Cooper's statement that the larger cerata are tipped with blue, 

 which agrees exactly with the figures in Cockerell and Eliot, who 

 show the larger cerata with blue tips, which the smaller cerata lack. 

 It seems very probable from the evidence furnished above that the 

 forms are identical, particularly when it is borne in mind that they 

 come from approximately the same area, and are the only forms so far 

 recorded from the whole coast with blue-tipped cerata. Sir Charles 

 Eliot informs me that he is inclined to agree with this decision. The 

 animal thus stands as Janolus barbarensis, Cooper. 



The classification and synonymy is therefore : — 

 Family JANID^. 



Genus Janolus, Bergh, 1884. 



Species Janolus barbarensis, Cooper, 1863. 

 Synonymy : Molis barbarensis, Cooper, 1863. 



Janolus coeruleopictus, Cockerell & Eliot, 1905. 



B. On the JEolidia herculea of Bergh. 



Bergh in 1894 described a form as /Eolidia herculea, and gave a 

 moderate account of its anatomy. He concludes : " Diese Form 

 scheint durch die Form der Kiefer von der in pacifischen Ocean 

 vorkommenden Varietat der JE. papulosa verschieden ; vielleicht 

 ist sie aber auch nur eine local Varietat " (3, p. 129). 



There appears to be no difference in other respects. If one 

 examines the figure of the mandible of Molidia papulosa given by 

 Bergh in 1879 (1, pi. i, fig. 1) and that of Molidia herculea by the 

 same author in 1894 (3, pi. i, fig. 8), it will be found practically 

 impossible, allowing for the slightly different style of drawing and 

 size, to distinguish between them. In his description of M. herculea 

 he states it is " gerundet und gewolbt wie bei keiner der anderen 

 bisher bekannten achten TEolidien". The difference, however, is 

 not sufficient to show in camera lucida drawings. 



In view of Bergh's proclivity for creating species and varieties 

 without sufficient justification, I have no hesitation in identifying 

 these tAvo forms as one and the same species. It should stand, 

 therefore : — 



Family ^OLIDID^E. 



Genus tEolidia, Cuvier, 1798. 

 Species Molidia papillosa, Linnaeus. 

 Synonym Molidia herculea, Bergh. 



List or References. 

 1. Bergh, R., "On the Nudibranchiate Gasteropod Mollusca of the North 

 Pacific Ocean, with special reference to those of Alaska. Pt. L " : Proc. Acad. 

 Nat. Sci. Philad., 1879, pt. i. 



