THE NAUTILUS. 47 



out of them." Having reached this conclusion, the only thing 

 that he could do was to credit the species described in the 

 Monography under these indeterminable names to Conrad. 



The list of names proposed by Rafinesque and not mentioned 

 in Simpson's Synopsis is also misleading. Of the twenty-three 

 " Unios " listed, only three were described as distinct species of 

 Unio by Rafinesque : eight are varieties of certain species of 

 Unio, while the remaining twelve are made up of one species 

 and eleven varieties described under various different generic 

 names. It would certainly have been better if Simpson had 

 given a complete list of all of the species named by Rafinesque 

 as long as he attempted to compile such a list at all. But the 

 value of quoting indeterminable species is questionable and so 

 far as nomenclatoral purposes are concerned, they are practical!}' 

 nomina nuda. 



In conclusion, Mr. Vanatta proposes new names for three 

 species described by Lea and Conrad under names supposed to 

 be preoccupied by Rafinesque. 



One of them, Pleurobema simpsoni, proposed for Unio striatus 

 Lea seems unnecessary as Rafinesque' s striata was described as 

 an Obovaria and not as an Unio. 



If Rafinesque's Unio nigra and Unio viridis are identifiable, 

 the other two changes proposed are proper under the Code. 



These changes are but a foretaste of what is likely to happen 

 to very many of the familiar names used for our American 

 species, when the thankless and interminable task of collating 

 all of the varietal names used for the Unionidae from the begin- 

 ning has been completed and the unnecessary and vicious pro- 

 visions of the Code in regard to the standing of varietal names 

 is enforced according to the letter of the law. 



A NEW TEREDO FROM THE WEST COAST OF AMERICA. 



BY PAUL BARTSCH. 



In looking over the West American Teredinidae in the collec- 

 tion of the U. S. National Museum, I find an undescribed 

 species from the San Diego region which may be called : 



