116 



EAST COAST MARINE SHELLS 



PI. 45, Figs. 7, 11 



North Carolina to Gulf of Mexico; 



West Indies 



TBITONALIA INTERMEDIA C. B. Adams. Shell 

 elongated, spire elevated; whorls seven to 

 eight, convex, sutures deep; six to eight 

 revolving scaly ribs; aperture small, ca- 

 nal short; color white or yellowish. Length 

 under 1 inch. 



PI. 45, Fig. 20 



Florida Keys; West Indies, Bermuda 



GENUS MURICIDEA Swainson 1840 



Closely related to the preceding 



genus , 



MURICIDEA ^JULTANGULA Philippi. Shell whit- 

 ish v/ith pale brown flecks, often with 

 purplish or rosy suffusion about the aper- 

 ture; when perfect the epidermis slightly 

 hairy. Length 18 mm. 



A very variable shell in color but 

 the rich pink mouth is most frequent. Ex- 

 amination of the radula is desired as this 

 may prove to belong to a totally different 

 family. Fresh specimens possess a hispid 

 epidermis with little triangular projection 

 points. 



It lives in shallow water, particu- 

 larly in the south, but has been dredged in 

 95 fathoms. 



PI. 45, Figs. 3, 12 



North Carolina to Gulf of Mexico; 



West Indies 



MURICIDEA OSTREARUM Conrad. Shell gray; 

 interior livid purple. 



This shell is often confused with 

 Urosalpinx perrugatus with which it lives 

 in the oyster beds. It may be separated by 

 a longer, more sculptured and less excavat- 

 ed shoulder to the whorl, also a wider and 

 shorter canal. The operculum is also total- 

 ly different with an apical nucleus (Dall) . 



Depth range 0-lS fathoms. Length 

 of shell 1 inch. 



PI. 45, Fig. 18 PI. 43, Fig. 5 



Tampa Bay to Cape Romano, West 



Florida 



MURICIDEA HEXAGONA Lamarck. Shell whitish, 

 epidermis pale brown or yellowish; about 

 five rows of spines on body v.horl, becoming 

 less prominent below; canal long and open; 

 outer lip thickened inside and with small 



teeth; apex often reddish color. Length 

 25-40 mm. Depth range 1-25 fathoms. 



PI. 44, Fig. 7 



Palm Beach, Florida to West Indies 



GENUS UROSALPINX Stimpson 1865 

 (OYSTER BORERS) 



Somewhat coarser and stouter shells, 

 canal deflected. 



UROSALPINX CINEREUS Say. Shell light brown 

 or yellow, rarely with red bands; aperture 

 pink, flesh color, brown or purple; about 

 ten rounded ribs on body whorl which are 

 widest and strongest in center of shell, 

 these crossed by about fifteen spiral ridges; 

 outer lip thin and crenulated. Average 

 length 1 inch. 



This the well-known oyster drill 

 probably also attacks other mollusks. 



PI. 45, Fig. 1 



PI. 69, Fig. 6 



Prince Edward Island to Florida 



UROSALPINX PERRUGATUS Conrad. A strongly 

 shouldered shell with a longer canal than 

 the preceding species; radiating lines more 

 pronounced and wavy; some individuals much 

 more slender; interior usually chocolate- 

 brown color. Length 28 mm. 



PI. 45, Fig. 15 



Cedar Keys to Key West, Florida 



UROSALPINX TAIilPAENSIS Conrad, Shell broad- 

 ly shouldered; surface latticed by whitish 

 vertical and horizontal ribs; outer lip 

 well extended, the terminations of the spi- 

 ral ribs forming projections; interior of 

 aperture grooved to correspond with exteri- 

 or surface; ground color often brownish in- 

 side and between ribs. Length 1 inch. 



This shell very much resembles 

 Eupleura with which it might be confused by 

 the novice. 



PI. 45, Fig. 5 



Cedar Keys to Cape Sable, Florida 



GENUS TROPHON Montfort 1810 



Shell fusiform; varices numerous; 

 spire conspicuous; aperture ovate; canal 

 open, often deflected. 



TROPHON SCALARIFORMIS Gould. (T. clathrata 

 of authors, not Linne) . Whorls eight, aper- 

 ture half length of shell; thirteen to 



