THE NAUTILUS. 15 



Nashville, Tennessee, and Jackson Co., Alabama, the latter collected 

 by Mr. Sargent, have a strong, thick, white, testaceous deposit 

 inside the base of the last whorl, with some nodules, apparently 

 irregular, but equal in the specimens from either locality, which 

 correspond to teeth or folds. These testaceous deposits in different 

 species are often smaller and thinner in mature shells than in ado- 

 lescent, and sometimes entirely resorbed ; they evidently are the 

 same morphological element as the deposits and folds in Gastro- 

 donta. 



5. I believe the fact must impress itself upon anyone that Zon. 

 ^ujoj)ress»5, especially the form noted above; gularis, ^\%o more in 

 some forms, much resemble Z. ligerus, demissus, etc., and are nearly 

 related to them, much more so than the latter are to the Mesomphix 

 between which they are inserted in systematic works. This feeling 

 found its expression also in W. G. Binuey's " L. & F. W. Shells," 

 where ligera, demissa, intertexta are ranged under the genus Hya- 

 linia, the Mesomphix under Zonites. To this now comes the species 

 announced under 3 above, resembling ligera as to the general con- 

 figuration of the shell, and " Gastrodonta " in the lamellae, which 

 are of a somewhat peculiar type at that, approaching it to signifi- 

 cans Bid. Some light on the significance of presence or absence of 

 internal teeth is given also by Conulus fulvus, in which, as we have 

 seen, such may be found or wanting in the same form from the 

 same locality. And a character common to the two groups, valu- 

 able even of higher order, seems to be the presence of a dart, in the 

 genital organs, which would range them together in the genus Zoni- 

 toides. It may be communicated here, previously, that I have 

 found, in the upper part of the penis in Z. ligerus, suppressus, the 

 forms mentioned under 3 above, and in arboreus a peculiar papilla 

 (Reizkorper of German authors) in which a part is hard, sharp, 

 projecting and (in the 3 former species) impregnated with carbonate 

 of lime. 



6. Quite lately, Mrs. Andrews has sent me specimens of a Zonites, 

 collected at Cranberry, Mitchell Co., North Carolina. They can 

 be referred to none of the described species, and may prove to be a 

 new one.' The shell, of about 7 m. in diam., has two very small 

 lamellae or teeth near the aperture, corresponding to the same Z. 



^ The n. sp., however, may be "hanged in the smoke till cured," or left in 

 suspense till fully confirmed; \\.\s, as such, of little consequence, but of great 

 importance as a form. 



