8 THE NAUTILUS. 



Type in National Museum. 



Remarks : Tliis is another of those shells that is not strongly dis- 

 tinct from other known forms and yel sufficiently removed from any 

 to make a name necessary. It seems to lie between U. castaneus 

 Lea and U. unicolor Lea — from the former it differs in being more 

 circular, thinner, not tumid, not so oblique, darker colored, shorter lat- 

 erals, less capacious, beaks blunter and undulations fewer and coarser. 

 From unicolor it differs in being thicker, rougher, more inflated, 

 narrower, pallial margin and white nacre. Some forms of it approach 

 U. leibi Lea, but are less inclined to a quadrate outline and blacker, 

 and the young are beautifully rayed. 



We name this species for Prof. B. W. Tinker, Superintendent of 

 Schools of Waterbury, Conn., who has a fine collection and takes 

 special interest in this branch of natural science. 

 {To be continued.) 



CREPIDULA CONVEXA SAY, VAR. GLAUCA SAY, SAN FRANCISCO BAY. 



As will be seen by the following from a recent letter received from 

 Mr. Hemphill, he has made another interesting discovery : 



" I had a couple of hours a few days ago on the old oyster-beds at 

 Alameda again, and have added Orepidida glanca Say to the intro- 

 duced shells from the east. 1 send you samples of the dark and light 

 varieties. The largest ones I send are as large as any among the 30 

 or 40 specimens I found." 



The largest measured 12^ mm. by not quite 9 mm. and are quite 

 characteristic. It remains to be seen whether this species will attain 

 as large size in this new environment as in its native haunts. The 

 last (February) Nautilus, it will be remembered, contained a brief 

 note, announcing the detection of Fusus ( Urosalpinx) cinereus, in 

 this same locality, on the eastern shore of the bay, a dozen miles or 

 so distant from where U. cinereus was first discovered. This is Mr. 

 Hemphill's third find of eastern forms in San Francisco Bay. 



The specimens above noted are in the U. S. National Museum 

 No. 158001. 



Robert E. C. Stearns. 



Los Angeles, Gal, March 10, 1899. 



