238 TRANSACTIONS OF THE WAGNER FREE 



Family NASSID^ (supplementary). 

 The other species enumerated by the various authors referred to will find 

 a proper place in the Nassidce, and may be apportioned among the following 

 groups: Ilyanassa and its section Paranassa ; and Nassa proper, section 

 Alecirion Montfort. 



Genus ILYANASSA Stimpson. 

 Subgenus Paranassa Conrad. 

 Ilyanassa (Paranassa) porcina Say. 

 Buccinum porcinum Say, Journ. Acad. Nat. Sci. iv. p. 126, pi. 7, fig. 3. 1824; Emmons, N. 

 C. Geo). Surv., p. 256, fig. 122, 1858 ; Tuomey and Holmes, Pleioc. Foss. S. Car., p. 133, 

 pi. 28, fig. I, 1856. 

 Tritia porcina (Say) Conrad, Proc. Acad. Nat. Sci. Phila., 1862, p. 562. 

 Ptychosalpinx porcina Gill, Am. Journ. Conch, iii. p. 154, 1867. 

 Paranassa porcina Conrad, Am. Journ. Conch, iii. p. 262, 1868. 



Chesapeake Miocene of Maryland, Virginia and the Carolinas. 

 This species has rounded whorls, a rather acute, rapidly dwindling spire, 

 appressed sutures and feeble siphonal fasciole ; when well grown it has a 

 thickened outer and inner lip and a single or double subsutural ridge. It is 

 of rude, rather irregular growth, and is almost destitute of basal constriction 

 behind the fasciole. 



Ilyanassa (porcina var.?) schizopyga Dall. 



Shell differing from typical /£>;-«'«« by its more elevated and conical spire, 

 its less inflated last whorl, square or rounded but not appressed suture, con- 

 stricted base, strong, flaring, sub-umbilicate siphonal fasciole, and more uni- 

 form and sharply reticulate sculpture. The aperture is thickened on both 

 sides, there is no subsutural lamina and the lirse of the outer lip run deeply 

 into the aperture instead of being confined to the vicinity of the margin. Alt. 

 of shell 32 ; max. diam. 18 mm. 



This apparently distinct form was found in Mrs. Purdy's marl-bed on the 

 Cape Fear River by Mr. C. W. Johnson. It is probably later Miocene. I 

 hesitate to assign it an absolute specific rank, notwithstanding the characters 

 mentioned, in the absence of more profuse material ; that available being only 

 two rather worn specimens. 



Ilyanassa (Paranassa) arata Say. 

 Plate 20, figure 15. 

 Buccinum araiwin Say, Journ. Acad. Nat. Sci. iv. p. 127, pi. 7, fig. 4 (bad), 1824. 

 Tritia arata Conr., Proc. Acad. Nat. Sci., 1S62, p. 562. 

 Paranassa arata Conr., Am. Journ. Conch, iii. p. 262, 1867. 

 Tritia idonea Conr., MS. label in coll. Acad. Nat. Sci. 



Chesapeake Miocene of Maryland (Say), North Carolina (Burns), and 

 Pliocene of the Waccamaw beds in South Carolina, C. W. Johnson. 



This species is shorter and more inflated, but with a more acute spire than 

 the following form : 



