No. (Us] MI LlIll; LI:<>\l\A y(.,>rLI)) 223 



authors. (jroukl,1852,dGscribe(l Melihe leouina, the species 

 upon which this paper is based, from Puget Sound, found- 

 ing for it tlie genus Chiora'ra now mer-jed in MeJibe. 

 Ber^^-li, in a series of papers Ix'twcen lS(i:! mid 1i»i)7 I'cxo- 

 lutioiiized the chissification ol' the X ii>!lhrnncln<ifa. lie 

 divided tlie Jiudihranchs into two sections: the /\ln<h>- 

 lirpafica and HoJohepat'ica porosf,jin>ifa. Althouuli his 

 work was primarily systematic, it was l):isf(l mi iiiorplio- 

 logieal studies. ITe added six species to the <r. ini- .1/^ Hhr, 

 includin^j: M. pcllucida, from tlie coast of \V;isliliii;t()n 

 near the mouth of the Cohiml)ia liiwi-. His (Ic^criptiiui 

 indicates such a close similarit\- td M.l<'<n/nni iliat it may 

 be questioned .whether this six-cii s is ciititlcd to spccilic 

 rank; material from the type locality nia\- lie iicccssa ry 

 to settle this point. The more recent work on taxonomy 

 by Sir Charles P]liot, 1910, modifies iU iuirs work to 



Xo detaihMl ^Uuh ha^ Ih'-ii made of M. J>nnnn, pn- 

 vious to the prcsmit woik ami oiir knowh'duv of the 

 species restcil h'ii-uvi\- with the l>ri<'f (h'sci'iption and 

 f[^\\v(i presented l)y (Jonhl. 



DlSTRIIU'TloN 



Mrlihe. as far as known, is restricted to the Pacilic and 

 Indian Oceans, and to the South Seas. On tlie eastern 



