6 Bulletin 3 (88) 



p. 268. 

 A. incongriM Reeve, Conch. Icon., vol. 2, pi. 8, fig-. 50. 



The Galveston specimens are small, but are well preserved and 

 .seem to admit of no doubt as to their identit}^ with Say's species. 



Range in depth. - From 2,443 ^o 2,920 feet. 



Area ponderosa var. caroUnensis. 



Sjm. — Ncetia pondeivsa V2S . caroUnensis Con., Proc. Phila. 

 Ac. Nat. Sci., 1862, p. 290. 

 N. caroUnensis Con., ibid., p. 580. 



The only differences observable between this variety as repre- 

 sented by specimens from the Natural Well, Duplin Co., N. C. , 

 and typical ponderosa seem to be that caroUnensis is more nearly 

 rectangular in outline and is more inequilateral. Conrad says, -*— 

 "Compared to \.y^\Q.?X ponderosa it is less ventricose, proportional- 

 ly longer, has 35 ribs whilst the latter has 26." I fail to find such 

 a decided difference in the number of ribs in the two forms. They 

 are very closely related. CaroUnensis mioreover has some features 

 in common with Umula. 



Range i?i depth. - From 2,552 to 2,871 feet. 



Aixa transversa var. busana, n. var. 



Syn. Ajra young oi floridaiiaf Harris, 4th Ann. Rep. Geol. 

 Surv. Tex., 1893, p. 121. 



In my preliminary report on the organic remains from this 

 well I queried the identit}^ of this form with floridana though it 

 agrees well with young specimens so labelled in the collection of 

 the U. S. National Museum. It now seems quite certain that 

 some of the Museum specimens are improperly labelled and that 

 the}^ should be regarded as specifically distinct from floridana. 

 Following the advice of my friend, Mr. C. T. Simpson, I here re- 

 fer the Galveston well specimens to a varietal form of transversa, 

 for which the name busana is proposed. This variety may be de- 

 fined as follows : — 



General characteristics as in ti^ansversa, but much more elong- 

 ated and less inflated ; hinge line not so extended as in Uenosa or 

 floridana, posterior broader, and base more nearly rectilinear, or 

 even emarginate. 



All the specimens from the well are young, the largest being but 

 1 2 mm. in length. 



Range ill depth .— From the surface to 2,920 feet. 



