THE NAUTILCS. 71 



first and second whorls small and the last one very large, forming a 

 rounded shoulder; so much larger, that in some of them the spire 

 appears to rise like a cone from an expanded surface. Not umbili- 

 cated. Aperture oval, columella scarcely folded, outer lip thickened 

 on sub-margin with a very pale yellowish-red callus. It corresponds 

 with Haldeman's description except the umbilicus. 



This species was described in 1842, and so far as I can learn, has 

 not been reported since. 



DOUBTFUL SPECIES. 



Physafontana Halderaan, 1841, = young P. heterostropha Say. 



P. subarata Menke, not sufficiently described tor recognition. 



P. parva Lea, 1864, probably young P, anatina Lea. 



P. altonensis Lea, 18G4, an abnormal form of P. gyrina Say de- 

 scribed from a single shell, and not heard of since. 



P. inflata Lea described many years ago, and not reported since. 



P. solida Philippi. This species was described many years ago 

 from forms found at New Orleans, but I have been unable to procure 

 any information regarding it. It is a very marked species, and it 

 seems that it should have been reported many times. The name is 

 pre-occupied, and should it ever be re-discovered, it will have to be 



given a new name. 



P. tenuissitna Lea, 1864. This is a very distinct species if it 

 exists. It was described from a single dead shell found at Alexan- 

 dria, La. I have been unable to get any information regarding it. 

 I have in my collection a single shell sent to me from Hudson, Ohio, 

 that bears this description, but until others are reported, it had better 

 stand in the doubtful list. 



P. globosa Haldeman, 1843. Like the two last, I have been 

 unable to learn anything about this species, except the description 

 given by Binney. It has been suggested that it is the same as P. 

 brevispira Lea. I do not concur in this opinion. The form is very 

 much the same, but this is a southern species, and these seldom get as 

 far north as the Great Lakes without materially modifying the form. 

 Besides if it was, it would be found in intervening territory, which 

 does not seem to be the case. 



GENERAL NOTES. 



LUCAPINA CRENULATA (SowERBv). On Aug. 3, at La Jolla, 

 Cal., Miss Vashti Thomas was so fortunate as to find a living speci- 

 men of this gigantic keyhole limpet, which she brought to me for 

 examination. As the published descriptions of the animal state it to 



