(o<h 



The Nautilus. 



Vol. XXIV. FEBRUARY, 1911. No. 10 



NOTES ON CALIFORNIA SHELLS (II). 



r-V WILLIAM II. DALL. 



Private collections at San Diego are numerous and interesting. 

 Those of Dr. Fred Baker, Prof. Kelsey, Miss Cooke, Mr. Gripp, 

 Mrs. Stephens and C. R. Orcutt may be especially noted. 



The Biological Station formerly at La Jolla is now removed sev- 

 eral miles northward to escape the effects of sewage, etc., from such 

 a rapidly-growing suburb, upon the fauna. The molluscan collec- 

 tions are unimportant, the energies of the staff of the station, under 

 the supervision of Dr. Ritter, being at present chiefly devoted to 

 problems of physical hydrology. Being the nearest United States 

 port to Lower California and the Gulf, the collectors of San Diego 

 have unusual opportunities for obtaining specimens from these locali- 

 ties through small coast traders and collectors of guano and salt. 



Mr. Hemphill, so long a resident of San Diego, has removed his 

 collection to Oakland, where it is still packed up, so there was no 

 opportunity for studying the rich collections of this veteran field 

 naturalist. It is to be hoped they will be acquired by one of the 

 public institutions of California, none of which at present has a truly 

 representative series of the California shells. 



Batiiytoma tremperiana, new species? 



Among the various collections studied, a form of Bathytoma was 

 frequently noted which is differentiated from the B. carpenteriana 

 by what seem to be very constant characters. Of these Dr. Tremper 

 has a particularly large series. It is possible that these differences 



