THE NAUTILUS. 113 



and well defined species, all attempts to connect thcni proving 

 failures. 



I recognize the existence of abnormal sports and jDOSsibly hybrids 

 and albinos, etc. These I did not contemplate, nor did I considei' 

 very young or old and eroded or decayed specimens. Barring these 

 I still think I could find a dividing line sufficiently distinct. 



I have not seen the dark colored U. horealis Mr. Simpson mentions 

 but the types were furnished to Mr. Gray by Mr. Latchford of 

 Ottawa, Canada and were taken from the Ottawa river. Mr. Latch- 

 ford has given me a good suite of like specimens. They seem dis- 

 tinct enough for a good species but it is a close relative of luteolus, 

 so close indeed that very young specimens are not easily separated. 

 The glass, however, shows the lines of growth a little coarser and the 

 shell consequently a little rougher. 



My mind still dwells on the wonderful vagaries of the TJnio 

 radiatus as described by Mr. Simpson. I should have some dread 

 of looking over the Lea collection with him for fear of getting so 

 confused that I should not know my wnfe unless I had her labeled 

 and was sure of her locality. 



ADDITIONAL U. S. FIS3URELLIDJE. 



We are informed by Mr. T. H. Aldrich that two species were 

 omitted from the Catalogue of this family published in the last 

 Nautilus, viz : 



Glyphis altior Meyer and Aldrich. — Eocene, Ala. Jour. Cin. 

 Soc. N. H. 1886, p. 41, pi. 2, figs. 16, 16a, 16b. Described under 

 the genus Fissurella. 



PuNCTURELLA Jacksonensis Meyer. — Eocene, Jackson, Miss. 

 Bericht der Senckenbergischen naturforschenden Gesellschaft zu 

 Frankfort a. M., 1887, p. 6, pi. 1, fig. 15. 



The types of both of these species are in the collection of Mr. 

 Aldrich.— jET. A.R& C. W. J. 



