112 BULLETIN OF THK BUREAU OF FISHERIES. 



coast, the characters of all the families and sul)families have been given, whether 

 representatives of them have been taicen in Montere}' Ra_y or not. In se\iM;il ia>es 

 the generic characters given by Bergh have been slightly moditied in uniniporttint 

 points to admit forms belonging unmistakably to the genus. 



For the identification of even the genera to which many of the inidibraneliiate 

 mollusca belong, it is necessary to make a full and careful dissection. This has been 

 done in each case, but a complete morphological description of the forms discusseil 

 in the iH-esent paper has not been attempted, simply an abridged account of the 

 anatomy sufficient for their ready identification being here contemplated. It has 

 l)eoii my especial endeavor to secure adequate colored drawings of all species not 

 elsewhere so illustrated, rnt'ortunatoly, with the exception of Alder and Hancock. 

 Trinchese, Vayssierc, and a few others, not many authors have published such illn- 

 trations. The lack is the more deplorable on account of the imiid^sibility of ])resprv- 

 ing the beautiful colors, or even the natural form, in the museum speiiinens. 



The following tabulation will indicate the general systematic leiationship of 

 the forms discussed in the present paper.' With the exception of tlie early and 

 fragmentary papers of Gould, Cooper, and Stearns, and several n)ore thorough ones 

 of Bergh, the California opisthobiancliiate :\Iollusea aiv pra.-tieally unknown. Thi- 



fact accounts for the larev proiuirtic f new -|)eric^ fomid liy me, which have been 



descril)ed in a brief preliminary papci- ))ul>lisli((| in I lie Proceedings of the Biological 

 Society of Washington (vol. wiii. Feb. :.'. l'.ii)."i). under the title "A Preliminary 

 Account of the Doridiihe of Montei-ey Bay. California." The types of these are 

 deposited in the United States National AIus<nmi, and cotypes will be placed in the 

 zoological museum of Leland Stanford Junior University and the nuiseum of the 

 Philadelphia Academy of Sciences; also in the author's collection. 



Order OPISTHOBRANCHIATA. 

 Sul)order Nudibranchiata. 

 Section Doridoidea. 



Family A. Doridid.e. 



