EAST COAST MARINE' SHELLS 



129 



small, black or gray, surface cancellated 

 by horizontal and vertical ribs, forming 

 nodules v/here they cross and giving a lat- 

 ticed appearance; nucleus and interior 

 brownish; outer lip crenulated by termina- 

 tions of the spiral sculpture. Length 7 mm. 



It was taken living under a stone, 

 in shallow water, off Pumpkin Key. The 

 author also dredged it in shallow water of 

 lower Card Sound and obtained beach speci- 

 mens at No Name Key, Florida. 



PI. 50, Fig. 5 



PI. 68, Fig. 5 



Card Sound to Key West and to 



Marco, Florida 



MITRA PUELLA Reeve. A dark brown or black 

 chunky little shell with flames or spots of 

 white; polished externally and with faint 

 decussating sculpture. Length 9 mm. 



This attractive little shell was 

 collected at extreme low tide upon the 

 rocks at Palm Beach, Florida. 



PI. 50, Fig. 4 



Cape Hatteras, North Carolina to 



West Indies 



MITRA HANLEYI Dohrn. A delicately marbled 

 species, ranging from gray or yellow, with 

 dark columella area, to nearly white. There 

 are about eleven strong, smooth, swollen 

 nodules on body whorl and fewer on earlier 

 whorls; color darker between the knobs and 

 below columella; fine incised horizontal 

 lines. Length 7 mm. 



One of the finest little shells in 

 Florida. It was taken under sponges at 

 Lignumvitae Key and dredged in Card Sound, 

 Florida. 



PI. 51, Fig. 15 



Card Sound, Florida to tlie West 



Indies 



MITRA HANLEYI GEMMATA Sowerby. A variety 

 of the preceding which is nearly black with 

 white or yellowish ribs. Length 7 mm. 



Charlotte Harbor, Card Sound, 



Florida 



MITRA SULCATA Graelin. Shell small, brown 

 with rather wide white bands; aperture half 

 length of shell; strong whitish plications 

 on columella. Length 10 mm. 



The specimen illustrated was ob- 

 tained near the ferry landing on No Name 

 Key. 



PI. 51, Fig. 13 



PI. 50, Fig. 3 



Florida Keys and V/est Indies 



GENUS VOLUTOMITRA Gray 



VOLUTOMITRA GROENLANDICA Gray. A whitish 

 shell under a brown epidermis. Length 12- 

 20 mm. The character of the peculiar radu- 

 la is shown on PI. 64. 



PI. 64, Figs. 6, 7 



Greenland 



Family Marginellidae (RIM SHELLS ) 



Shell smooth, shining, porcellanous, 

 imperforate, some with longitudinal ridges; 

 spire short, sometimes sunken; aperture 

 long, outer lip thickened, sometimes pro- 

 vided with teeth; columella with three to 

 four plaits. 



GENUS MARGINELLA Lamarck 1801 



MARGINELLA APICINA Menke. Usually pale yel- 

 low, sometimes white, pinkish or dark, often 

 with several spots on edge of outer lip. 

 Length usually under 12 mm. 



The most plentiful Marginella in 

 Florida v/aters. A left-handed example, in 

 tlie author's collection, was collected in 

 Tampa Bay, Florida. 



PI. 50, Fig. 22 



North Carolina to Gulf of Mexico; 



West Indies 



MARGINELLA APICINA BOREALIS Verrill. A 

 heavier, whiter shell than the preceding 

 one. Range 64-100 fathoms. 



Off Martha's Vineyward, Massachu- 

 setts to Virginia 



MARGINELLA APICINA VIRGINEA Jousseaume. A 

 pale flesh-colored form, pinkish inside. 

 Florida Keys and West Indies 



MARGINELLA CARNEA Storer. An orange or red- 

 dish shell with a narrow white band, lip 

 and callus white. Length 18 mm. 



PI. 49, Fig. 8 



Cape Hatteras, North Carolina to 



West Indies 



MARGINELLA DENTICULATA Conrad. This shell 

 varies considerably in size, especially in 

 stoutness; pure white or banded spirally 



