aia, 

NUDIBRANCHIATA OF THE L.M.B.C. DISTRICT. 237 
NoTE ON SOME BRITISH SPECIMENS OF HERO FORMOSA, 
Loven, BY Proressor W. A. HERDMAN. 
Hero is a Scandinavian Nudibranch, which was first 
made known by Lovén* in 1839, and has been more fully 
described by G. O. Sarst and by Bergh.{ At the time of 
publication of Alder and Hancock’s monograph, Hero 
formosa had not been found in British Seas, but Gwyn 
Jeffreys records§ in 1869, that it had then been dredged off 
the Northumberland coast by G. 8. Brady, in the Clyde 
district by Robertson, and in the Minch, from a depth of 
- sixty fathoms, by himself. 
In 1880, I dredged two specimens of this beautiful 
animal in Lamlash Bay, Arran,|) and since then I have 
dredged a third specimen off Salen in the Sound of Mull 
from a depth of twenty fathoms. So that altogether I 
have collected three specimens on the west coast of 
Scotland. Of these, I have one in the Zoological Museum 
of University College, Liverpool, the second was given to 
Dr. A. M. Norman, and the third was sent to Dr. R. Bergh, 
who has made most excellent use of it in his recently 
published account" of the anatomy of the species. 
The remarkable dorsal papille of this species have been 
figured by several of the above mentioned investigators, 
and their branched condition has been recognised by all. 
Lately, however, M. A. Vayssiere has published a note on 
* “*Vetensk. Akad. Handl.,” 1839, p. 234. 
+ ‘‘Mollusca Regionis Arcticee Norvegie,” 1878, p. 316. 
+ “*Malacol. Untersuch.” Ht. vii., p. 399, 1874. 
§ ‘British Conchology,” vol. v. 
| ‘Additional Notes on the Invertebrate Fauna of Lamlash Bay.” Proc. 
Roy. Phys. Soc., Edin. vol. vi., p. 15, pl.i, figs. 4 to 6, 1881. 
(Beitr. z. kenntn. d. olid., Verh. d. k. k. zool.-bot. Gesellsch. i. 
Wien, 1888, p. 699. 
