114 PROCEEDINGS OP THE ACADEMY OF 



Lea's figure of Melania perstriata, and I have specimens of loc. 

 28 that were returned to me as perstriata. 



Shells of loc. 10 bear a strong resemblance to Mr. Lea's figure 

 of T. Sycamorense, from which they are (by implication) supposed 

 to be distinct. 



Some of the least plicate specimens of loc. 2 are very like Mr. 

 Lea's figure of Melania oblita, and, of course, have been referred 

 to Try. unciale by my correspondents. I unhesitatingly refer 

 Mr. Anthony's Mel. baculum as a synonym to Gon. arachnoidea ; 

 baculum being the adult form, arachnoidea the immature form ; 

 arachnoidea has priority ; but at the same time I think a careful 

 stiuty of the various shells which mayj^etbe identified with arach- 

 noidea will result in assiguing priority to some other name. 



Goniobasis parruta, Lea. 



Localities, 2, 4, 1 1, 13, 15, 18, 22, 24, 32. This is also a variable 

 species. The largest specimens occur in loc. 2 ; the most perfect 

 shells occur in loc. 18. 



Goniobasis acuto-carinata, Lea. 

 Localities, 1, 3. 



Goniobasis aterina, Lea. 



Localities, 2, 4, 5, 6, 8, 14, 19, 22, 25, 27, 30, 31, 33, 36, 39, 40, 41, 

 44. Localities 2, 4, produce remarkably perfect shells which my 

 correspondents have differently named as graminea, Hald.; Saf- 

 fordii, Lea, and aterina, Lea. Usually this species is much 

 eroded. 



Goniobasis castanea, Lea. 



Localities, 1, 2, 3, 4, 7, 8, 9, 14, 16, 18, 21, 24, 26, 31, 37, 45. Lo- 

 calities 2, 4 produce shells, the upper whorls of which are smooth; 

 all the other localities produce shells which, when perfect, are 

 slightly but variably carinate above. Some of the varieties have 

 been referred to Gon. difficilis, Lea; but as that species is "obso- 

 letely plicate" on the upper whorls, the reference does not seem to 

 have been well considered. Localities 30, 31 produce decallate 

 shells that bear a strong resemblance to figures of Gon. pulla, 

 lit':!, hut possibly not identical. Some of the varieties have been 

 referred to " Mel. simplex, Say." I am not able to say the iden- 

 tification is conclusive. 



