MAltiJ.ANJJ UKOLUUICAL SUliVKY 135 



FUSUS (?) INTERSTKIATIS 1 ffil |ili II. 



Pint.' XXTT, Figs, i, 4a. 



Fhsiis iii/irslriiilits lleilpriii, isso, I'loc. Acail. Nut. Sei. I'liilii., vol. .\.\.\v, pi. xx, 



liii-. 11. 



Description. — '" Shell rii>ir(iriii. .-Iciidrr. ((iiniioscd (if alunit. ten convcw 

 volutions, the first three nf which arc smonth; whorls ornamented with 

 both longitudinal |ilications and revolving lines, the last of which (a1)(>ut 

 eight in the upper whorls), alternate with finer intermediate striae; the 

 longitudinal plications distinct on the earlier whorls, bnt becoming much 

 less so on the body whorls, and the one ])receding; ajjcrtiirc about the 

 length of the spire; the canal somewhat tortuous; outer lip thin, den- 

 tate within." Heilprin, 1880. 



The Maryland form differs from that from the Gulf states in that 

 its ribs are alternate, while in the latter they are doubly alternate or 

 with three smaller ones between each pair. The longitudinal plications 

 may be either present or partly absent as on the Gulf form. 



Length, 16 mm.; width, 6 mm. 



Occurrence. — IsTanjemoy Foematiox. "Woodstock. Aquia Foema- 

 TiON, 1 mile northeast of Piscataway, Aquia Creek. 



Collection. — Maryland Geological Survey. 



Family MURICIDEA. 



Genus TROPHON Montlbrt. 



Teophox subleyis Harris. 



Plate XXII, Fig. 3. 



TropJion sublevis Harris, 1899, Bull. Amer. Pal., No. 11, p. 61, pi. viii, figs. 1, 19. 



Description. — "Size and general form as indicated by the figure; 

 whorls seven, embryonic three smooth, spire and body Avliorl smooth, 

 polished, but with nine sharp-edged costae on each whorl, becoming 

 somewhat pointed on the shoulder; faint undulations indicating indis- 

 tinct, distant spirals between the ribs; outer lip thickened, with five 

 crenulations within, the upper the stronger; no umbilicus." Harris, 

 1899. 



