PLANOHBIS. 



Ill 



PlanorJiix Ji'ddimani, Dunker in Cuemn. ed. 2, p. 59, pi. x, f. 38-40 (not 

 Adams). 



The above are copies of the original descriptiou aud figures of 

 this species. 



The name has been used by Adams, Contr. to Conch. Ill, 43, 

 Oct. 1849. This will probably necessitate another name for 

 Dunker's shell. I cannot ascertain the date of his description in 

 the second edition of Chemnitz. 



ScTBGENns ADULA, H. Adams. 



Shell with the whirls rounded and numerous, deeply umbili- 

 cated on the upper, and convex on the under side ; aperture 

 campanulate. 



Fig. 186. 



Planorltis iHMltivolvis, Case. — Shell about five-eighths of an 

 inch in diameter; whirls seven, about half the last whirl overlapping the 

 preceding one, sometimes the last whirl suddenly distorted and expanded 

 for the last half of its length ; right side concave, left 

 side slightly acuminate and considerably carinate ; 

 throat campanulate ; aperture opening towards the 

 left, but projecting on both sides beyond the pi'eceding 

 whirl. 



This shell, also, I obtained from Captain Stanard, 

 who found it in the northern part of Michigan. It is 

 very distinct from any Planorbis I have met with, or 

 have been able to find any description of. I have 

 named it from its strong characteristic — a greater 

 number of whirls than usual in the geniis. {Case.') 



Planorhis multivolris, Case, Am. Journ. Sc. [2], III, 



101, f. 4, 5 (1847). 

 Adula multivolvls, H. Adams, Proc. Zool. Soc. Lond. 18(31, p. 145. 



I have heard of this very peculiar species being found at no 

 other locality. No. 9122 of the collection was received from Mr. 

 Case, by Dr. Gould, and by him presented to the collection. The 

 original description and figure arc given above. 



