120 



EAST COAST MARINE SHELLS 



Shell ventrlcose in shape, longitudinally 

 ribbed, chestnut banded near suture and be- 

 low on body whorl. Length 5-7 mm. 



PI. 46, Fig. 3 



North Carolina to Florida; West 



Indies 



GENUS NITIDELLA Swainson 1840 

 (GLISTENING SHELLS) 



NITIDELLA CRIBRARIA Lamarck. Shell oblong, 

 pyramidal, spotted often with whitish col- 

 or; tip generally broken off; whorls seven 

 to eight; upper teeth, inside outer lip, 

 larger than the others; epidermis usually 

 heavy and almost black or dark brown. 

 Length 10 mm. 



This species is often abundant on 

 rocks, between tides, on the Florida Keys 

 and in Biscayne Bay. 



PI. 46, Fig. 5 



Palm Beach County to Florida Keys; 



West Indies 



NITIDELLA LAEVIGATA Linne. Shell thin and 

 shining under a light epidermis; base 

 white with zigzag lines and chocolate-col- 

 ored spots, the latter often upon the 

 periphery; outer lip toothed, aperture 

 large; whorls five to seven. Length 17 mm. 



In old specimens the apex is apt to 

 be obtuse. 



PI. 46, Fig. 15 



Palm Beach to Florida Keys; West 



Indies 



NITIDELLA NITIDDLA Sowerby. Surface smooth, 

 shining, whitish marked with brown; six 

 whorls, the last one equal to three-fourths 

 the length of the shell; aperture narrow, 

 twelve teeth inside outer lip, black be- 

 tween the teeth. Length 15 mm. 



A strikingly beautiful little shell, 

 especially if obtained alive. It may be 

 taken among seaweed, at extreme low tide, 

 upon the ocean rocks at the north end of 

 Palm Beach, Florida. 



PI. 46, Fig. 9 



Jupiter Inlet, East Florida, south- 

 ward to West Indies 



NITIDELLA MOLECDLINA Duclos. Surface whit- 

 ish with an open network of chestnut which 

 become curved and darker near the suture; 

 sometimes very dark colored but still ex- 

 hibiting the pattern. Length 10 mm. 

 PI. 46, Fig. 6 



Florida Keys; West Indies, Pacific 



GENOS MITRELLA Risso 1826; Astyris, 

 H. and A. Adams 1858 (LITTLE MITRES) 



MITRELLA FUSIFORMIS Orbigny. Shell white 

 or yellowish, spirally sulcate; spire long, 

 apex sharp; whorls nine; aperture oval, 

 canal distinct, outer lip white and toothed. 

 Length 6 mm. 



This species lives at moderate 

 depths but is very rarely taken upon the 

 beaches. 



PI. 35, Fig. 19 



Southern Florida and West Indies 



MITRELLA LUNATA Say. Shell small, surface 

 smooth, red-broTm, two series of crescent- 

 shaped whitish spots; aperture oval in 

 shape, outer lip dark brown and toothed in- 

 side. Length 5 mm. 



Their station is Just below low- 

 tide mark, clinging to weeds and bits of 

 shell. It is said to be abundant from the 

 North Shore, above Boston, around to Buz- 

 zards Bay, often associated with Bittlum 

 alternatum. In the spring of the year they 

 venture out on the sands. 



PI. 46, Fig. 18 



PI. 69, Fig. 16 



Prince Edward Island to Gulf of Mex. 



SECTION PLECTARIA Dall 1924 



MITRELLA ALBELLA lONTHA Ravenel . Whorls 

 about six, flattened, deeply channelled at 

 suture; about fourteen slightly oblique 

 axial ribs upon final whorl and spire but 

 not extending below periphery; spiral 

 grooves below periphery which extend in- 

 ward upon columella; color white, often 

 clouded with amber or brown color. Length 

 6 mm. 



It is not rare upon the beaches at 

 Sanibel, Florida. 



PI. 46, Fig. 1 



Gulf of Mexico and West Indies 



MITRELLA PURA Verrill. 

 seen this species. 



PI. 69, Fig. 13 



The writer has not 



Family Nassarildae 



Ovate-shaped shells, variously 

 sculptured, inner lip smooth with enamel 

 spreading over wall of shell; outer lip 



