INSTITUTE OF SCIENCE, PHILADELPHIA. 237 



ring Paranassa to the latter as a subgenus. He also describes a subgenus 

 Tritiana for Nassa trivittata Conr. non Say, which he renames T. peralta. 



In 1889, the writer (Rep. Blake Gastr., p. 175) described a recent species, 

 which with little doubt is properly referable to Ptychosalpinx proper, having 

 all the conchological characters of that group, and showed that by the feat- 

 ures of the anatomy the animal, as supposed by Gill, is really related closely 

 to Chrysodoinns of the Bjiccinidce, and therefore should be separated from the 

 nassoid forms heretofore associated with it. 



The following species appear to be correctly referable to Ptychosalpinx 

 as restricted : 



Ptychosalpinx {Buccinimi) altitis Conr. sp. (1832) Gill, Am. Journal Conch, iii. p. 154, 1S67. 



Chesapeake Miocene of Maryland and Virginia. 



Ptychosalpinx {Buccinuni) multirugata Conr. sp. (1841), Am. Journ. Sci. xli. p. 345 ; Gill, 

 op. cit., p. 154. 



Chesapeake Miocene of Maryland at Easton. 



Ptychosalpinx {Buccinuni) fossulata Conr. sp. (1843), Proc. Acad. Nat. Sci. i. p. 30S. 



This species appears to be a smooth form of Conrad's B. bilix as origi- 

 nally described, but that name includes in later references two species, one of 

 which may prove to be a Rapana. As neither has been figured, it will prob- 

 ably be best to drop the name bilix entirely, the original and only description 

 being quite insufficient to determine the species. It has been collected by 

 Mr. G. D. Harris, of the U. S. Geol. Survey, at Plum Point, Maryland, and 

 near Yorktown, Va., in the Chesapeake formation. Conrad's type in the 

 Academy's collection can hardly be separated from the preceding species. 



Ptychosalpinx {Buccinum) TuomeyiW. C. Lea sp. (1845), Trans. Am. Phil. Soc. ix. p. 271, 

 pi. 37, fig. 97. 



This species, according to specimens obtained by Mr. Harris at York- 

 town, Va., is less flattened at the sides than Lea's figure would indicate, and 

 is more buccinoid in general appearance than any of the others. It is only 

 known from the Chesapeake Miocene of the James River, Va. 



Ptychosalpinx {Buccinuni) laqueata Conr. sp. (1832), Foss. Tert. Form., p. 19, pi. 4, fig. 5. 



Chesapeake Miocene of James River, Virginia, and Alum Bluff, Chatta- 

 hoochee River, Florida. 



This species by its sharp-cut sculpture and axial plications recalls PJios 

 and such species as " Nassa " nniciiicta Say, which the writer has already 

 shown (Blake Gastr., p. 178) has a nearly buccinoid operculum. 



Ptychosalpinx {^Bticcinmn') lienostim Conrad (Proc. Acad. Nat. Sci. i. 308, 

 1843), though a mere fragment, hardly appears to differ from P. fossulata. 

 It has been figured in the Am. Journ. Conch, iii., pi. 19, fig. 9. 



