16 THE NAUTILUS. 



Of 58 " 43 or 74.1 per cent, have gr. diam. 24 mm., and over. 



Of 26 stearnsiana 12 or 46.1 per cent, have gr. diam. 23 to 24 mm. 



Of 26 " 21 or 80.7 per cent, have gr. diam. 24 mm. and 



under. 



Of 58 kellettii 56 or 96.5 per cent, have whorls 5 to 5 +. 



Of 26 stearnsiana 19 or 73.1 per cent, whorls 5^ to 5|. 



A series of 31 kellettii, selected by Hemphill to show variation in 

 size, shape and color, but not included in above lot, are from 20^ to 

 31 mm. gr. diam., whorls 4^ to 5^; 23 or 74.2 per cent.; one 24 mm. 

 and over and 18 or 58.6 per cent, have 5 to 5 + whorls. 



Summing up : E. kellettii is the species found on Santa Catalina 

 Island, having a large embryonic shell with smooth whorls, surface of 

 all the later whorls faintly granulated ; generally over 24 mm., 

 greatest diam.; whorls 5. (On the mainland at Ft. Vincent, Los 

 Angeles Co., Hemphill found dead shells which agree exactly with 

 those from Santa Catalina, but could find none alive). E. stearnsiana 

 is confined to the mainland and the islands of Lower California. 

 Embryonic shell smaller, sculptured with wavy lines giving it a 

 granulated appearance, remaining whorls smooth except for lines of 

 growth and sometimes faint revolving lines ; greater diam. generally 

 under 24 mm., whorls 5^ to 5|. 



There is a wide variation in size, color and shape in both species 

 and a number of the forms of kellettii have been named by Hemp- 

 hill. Measurements below show largest, smallest, most elevated and 

 most depressed of 89 kellettii and 26 stearnsiana in my collection. 



E. kellettii, largest, 31 x 26 x 23 mm. whorls 5. 



" smallest, 20^ x 17^ x 16^ mm. whorls 5. 



" elevated, 26 x 23^ x 25 mm. whorls 5^. 



" depressed, 26 x 21 x 18 mm. whorls 5. 



E. stearnsiana, largest, 25^x 22 x 21^ mm. whorls 6. 



" smallest, 20 x 17 x 15 mm. whorls 5 +. 



" elevated, 21 x 20^ x 2<H mm. whorls 5. 



" depressed, 23 x 19^ x 16 mm. whorls 5^. 



MOLLUSKS OF OKLAHOMA. 



BY JAS. H. FERK1SS. 



Few if any shells have been recorded from Oklahoma territory. 

 No state or territory in the Union has figured so little in concholo- 



