184 AMERICAN JOURNAL 



BUSYCON, Bolten. 

 Recent sjyecies. Miocene species. 



\ B. ARUANUM, Lin. B. filosum, Conrad. 



Pyrula carica, Lam. ^ B. maximum, Conrad. 



B. spinosiion, Conrad. B. TRiTONis, Conrad-. 



^ B. ELiCEANS, Montfort. 



B. CANDELABRUM, Lam. 

 B. COARCLATUM, Sow. 



Beversed species. Oligocene species. 



B. KiENERi, Phillippi, ^ B. spiniger, Conrad. 



B. gihbosiim, Conrad. ^ B. ADVERSARIUM, Conrad. 



B. PERVERSUM, Lin. 



Subgenus Sycopsis, Conrad. 



Tuberculate, not canaliculate. 



dfiocene species. Eocene species. 



B. CARINATUM, Conrad. ". B. nodulatum, Conrad. 

 B. FUSIFORME, Conrad. 

 B. scalaspira, Conrad. 

 ^^ B. STRIATUM, Conrad. 

 B. TUBERCULATUM, Conrad. 



Bevei'sed species. 

 B. CONTRARIUM, Conrad. 



In this subgenus there are seven species which have no living 

 representatives, or forms possessing the same subgeneric char- 

 acters. 



Notes. 



1. S. plagosus. The reference to Lister in Proceedings of 

 Academy, 1862, is an error. It shoukl be to Chemnitz, iii., 

 738. It is figured by Kiener as a variety of S. canalicukUus, 

 pL 10, fig. 2. S. elegans, Conrad, is a variety. 



2. S. 2J9/rum. The tubercles are only in the young shell, or 

 near the apex in the adult. 



3. >S'. incilis. Tuberculated like the preceding. It is the only 

 thick and ponderous shell of the genus. 



4. S. excavatus. Tuberculated like the preceding. In this 

 species the spiral channel assumes the character of a profound 

 canal, which eminently distinguishes it from all the other 

 species. 



