1 32 THE XAUTILUS. 



look for more specimens, but ho])e to be able to do so in the spring. 

 If I succeed in finding more will report it, believing that some of the 

 readers of the Xautilus would be interested in the find, from this 

 locality. — Nettie A. Rowley, Evansville, Wis. 



Caxtharidus iris Martyn. — It is not generally known, we 

 believe, that the young of this handsome New Zealand shell is 

 unibilicated ; but a specimen 18 mill, in length in the collection of 

 Mr. Shelley G. Crump shows this to be the case. The umbilicus is 

 narrow and like that of an Eutrochtis. The shell is evidently quite 

 normal, and would serve quite well for a " new species" oi Eutro- 

 ehiis, the ])eriphery being sharper than in adult C. iris. Under a 

 lens the surface of this specimen, as well as of some others in the 

 Philadelphia Academy collection, is seen to be finely pitted, as if 

 eroded by an Eschara. We say as if, for no trace of foreign growth is 

 visible on the shell. It would be interesting to know the cause of 

 this sculpturing.— if. A. P. d- C. W. J. 



De. "Wm. H. Ball's second volume upon the tertiary mollusca 

 of Florida, etc. has appeared. A full notice of the numerous impor- 

 tant additions to our knowledge of this fauna contained therein will 

 be given next month. 



An interesting paper . read by Mr. Joseph Willcox before the 

 Delaware County Institute of Science, entitled " On the Evolution 

 OF the Earth and the Heavenly Bodies," has been published 

 in pamphlet form. The course of cosmic and terrestrial evolution 

 is graphically described in the light of the latest researches; it 

 would be difiicult to find elsewhere the same amount of reliable infor- 

 mation presented in such compact and readable form. 



EXCHANGES. 



Wanted. — Fossils, especially Trilobites, also Murex and Zonites, 

 any locality, and shells not in my collection. OflTered — British 

 Land and Fresh Water and U. S. Land and Fresh Water shells. — 

 Robert Walton, Houghton St., Ro.vhorough, Phila., Pa. 



Marine, Land and Fresh Water shells, fossils, minerals, to 

 exchange for marine shells or reliable works on marine mollusca. — 

 Homer Squyer, Mingusv'dk', Montana. 



Wanted. — Unios and other fresh water and land shells, in 

 exchange for those of southern Wisconsin. Please send list and 

 receive mine. — Nettie A. Roivley, Evansville, Wis. 



