THE NAUTILUS. 



15 



kellettii. This is copied verbatim in Manual Amer. Land Shells, p. 

 151. 



In examining a large series of kellettii from Santa Catalina I found 

 one shell which agrees exactly with Forbes' original description and 

 figure, and the later figures sent me by Mr. Smith, in size and color, 

 but it has 5 whorls instead of 6. AH of this lot, about 90 shells, 

 have the peculiar sculpture noted by Binney while none of the 

 stearnsiana from the mainland of L. Cal. have it, and as Mr. Ponsonby 

 informs me that this sculpture appears on Forbes' type, I think we 

 can safely limit kellettii to Santa Catalina Is. 



Fig. 1. Embryonic whorls of E. kellettii Fbs. "The isthmus," Santa Catalina I.; 



shell 26 mm. diam. 

 Fig. 2. E. stearnsiana Gabb, San Diego ; shell 26 mm. diam. 

 Fig. 3 shows Fig. 1 superposed upon Fig. 2, the latter in stippled line. All 



figures X 10- 



The sculpture of the embryonic whorls of the two species also in- 

 dicates that they are distinct, that of kellettii consisting of very weak 

 radial lines, not ivaved, so that the whorls appear almost, smooth, 

 while in stearnsiana it is a very closely set series of wavy lines, gen- 

 erally bifurcate at the suture, giving the surface a granulated appear- 

 ance under low magnification. The accompanying figures show the 

 difference in size of the embryonic shells of the two species, figs. 1, 2, 

 and in fig. 3 the drawings are superimposed to bring out the difference 

 more distinctly. 



A series of 58 kellettii from Santa Catalina show-; a variation in 

 greater diameter of from 2H to 27 mm., whorls from 5 to 5^. 26 

 stearnsiana, mostly from San Diego, vary from 20 to 25^ mm., 

 greater diameter, whorls 5 to 6. 



Figuring both series into percentages: — 



Of 58 kellettii 27 or 4G.5 per cent, have gr. diam. 25 to 2G mm. 



