154 AMERICAN JOURNAL 



is distinguished from Buccinum as represented by the type named, 

 by the more oblique canal and its concurrence with the siphonal 

 fasciole,* the linear fold in front of the columella, the esinuate 

 labrum as well as by the sculpture. The American species have 

 recently been referred to Tritia, a subdivision of iVassa, but pro- 

 bably through inadvertence. The known representatives of the 

 genus are extinct and characteristic of the later Tertiary forma- 

 tion, one being found in the Miocene beds of Yorktown, Virginia, 

 and a second in the Upper Tertiary beds at Monthelan in Tour- 

 aine, (France.) 



1. Ptychosalpinx altilis. 



Buccinum altile, Conrad. Tert. Foss., p. 19, pi. iv., f. 6. 

 Tritia altilis, Conrad. Journ. Ac. N. S. Phil., 1862, p. 562. 



2. Ptychosalpinx multirugata. 



Buccinum multiruqatum, Conr. Am. Journ. Sc, xli., 345 ; 



T. & H. Plioc. Foss. S. C, p. 133, ph 28, f. 2. 

 Tritia multirugata, Conr. Proc. Ac. N. S. Phil., 1862, p. 562. 



Miocene. — N. and S. Carolina. 



3. Ptychosalpinx porcina. 



Bucci7ium porcinum, Say. Journ. Ac. N. S. Phil., iv., p. 126 ; 



T. & H. Plioc. Foss. S. C, p. 133, pi. 28, f. 1. 

 Tritia porcina, Conr. Proc. Ac. N. S. Phil., 1862, p. 562. 



Miocene. — Maryland ; N. and S. Carolina. 



4. Ptychosalpinx Escheri. 



Buccinum Escheri, Mayer. Journ. Conch., vii., 1858, p. 82, 

 pi. iv., f. 6. 



Other species confounded with Buccinum, &c., appear to be- 

 long to the genus, but cannot be referred to it with the certainty 

 desirable, and the preceding are given as typical examples. 



* The siplionalfasciole is the zone generally differentiated by sculpture 

 which at its end forms the internal boundary of the siphonal notch or 

 canal. As its raodilications and relations are often of considerable im- 

 portance and serve to distinguish genera and higher groups, it is deserv- 

 ing of a distinctive name, and that here proposed is sufficiently sugges- 

 tive. 



