Baker — Critical Notes on the Muricidae. 381 



Omel.); EupJiyUon, Jouss., 1880 (type M. monodon, Sowb.; 

 Inermicosta, Jouss., 1880 (type 31. fasciatus Sowb.). So 

 far as my material goes, I am able to trace a gradual transi- 

 tion from very spinose to a condition entirely destitute of 

 spines. Some character other than the shell must be chosen 

 upon which to base the subdivisions of this group, if, indeed, 

 such division is necessary. 



MuREX MrcROPHYLLus Lam. 



Murex microphyUus Lam., An. sans Vert., IX, p. 576. 



Murex Poirieri, Jousseaume (Le Naturaliste, No. 44, p. 

 •349 ; Nouvelles Archives du Museum, p. 58, pi. iv, fig. 2, a, b, 

 1882) is a synonym of microphyUus. I can find no dis- 

 tinctive characters in the description, and I have seen typical 

 specimens oi micvopliyllus which. c?innoi be distinguished from 

 the fio-ure. Murex Jousseaumei Poirier, described in the 

 same paper, is also a synonym. 



Murex Banksii Sowb. 



Murex Banksii Sowb., Conch. 111., fig. 82. 



Murex Boiirguignaii, Poirier (Nouvelles Archives du 

 Museum, p. 57, pi. v, fig. 2, a, b), is a synonym of this 

 species. 



Murex torrefactus Sowb. 



Murex torrefactus Sowb., Proc. Zool. Soc, p. 141, 1840; Conch., 111., fig. 

 120. 



Murex Rochebruni Poirier (Nouvelles Archives du Mu- 

 seum, p. 57, pl.v, fig. 1, a, b), is a slim, elongated form of 

 this species. In the last three species the authors have been 

 unfortunate in fixing upon the frondosity as a specific charac- 

 ter, really one of the most mutable characters of the whole 

 family. Particularly in this subgenus is this variation most 

 perplexing, and instead of new species being found, old ones 

 will be seen to merge with others, and a reduction of species 

 will be the result. 



Murex rufus Lamarck. 



Murex rufus Lara., Anim. sans Vert., IX, p. 574. 



This species is not a synonym of Murex adustus Lam., as 

 quoted by Mr. Tryon. Dr. W. H. Dall quotes it from the 



