NORMAN: ON THE MOLLUSCA OF BERGEN FIORDS. 77 



P. 47, line 24 and 27, and p. 48, line 8, for "Z?. abrssorion''' xe^d 

 "Z>. stfiolaiinn." 

 [The foregoing paper was sent to the printer last September. 



I afterwards received a copy of the MoUusca Regioiiis Ardicce. 

 NorvegicR^ from the author, Professor G. O. Sars. I much regret 

 that this valuable nev/ work was not in my hands when I was 

 drawing up my paper. As it is, I have only inserted a reference 

 to the description of Cadulus propinquus; and I may add here 

 that the shell I have recorded as Decipula ovafa, Jeffreys, MS., is 

 the same as that descibed by Sars under the name Tellemya 

 oval is, n. sp., p. 341, pi. xxxiii., fig. la — c. 



Sars' work is admirable; no student of the Boreal and Arctic 

 Fauna can possibly do without it. All the species recorded by 

 me from Bergen, which are not members of the British Fauna 

 will here be found amply illustrated. The genera and species are 

 described in Latin. The work contains thirty-four plates of the 

 mollusca themselves, and seventeen folded (quarto-sized) plates of 

 crowded drawings of the radulce ('tongues') openula, &c. These 

 plates have all been executed by Professor Sars himself, and are 

 engraved by a new autographic process. The figures are simply 

 perfect. ' Nothing can exceed the accuracy of outline, the softness 

 of finish, yet extraordinary attention to minuteness of detail. 

 There is a great multiplication of genera in this book, for example, 

 the British species of Chiton are severed into six genera, the 

 TrocJii into five, the Rissoaz into four, and the Odostomia. (Jeffreys) 

 into six. There cannot be a doubt that the grounds on which 

 many of the genera are separated by the author are valid, but we 

 regret that the process has been carried so far, though with 

 increasing knowledge there has been, and for a long time to come 

 must be, a continual subdivision of groups going on.] 



"^ Bidi-agtil Kiindskabm om Norges Arktiske Fauna : I. Mollusca Regionis 

 Arcticc'c NorvegicE : oversigt over de i Norges Arktiske Region forekommejidc 

 Bloeddyr afDx. G. O. Sars. — Broegger, Christiania, 1878. 



