100 



EAST COAST MARINE SHELLS 



greenish or orange color, usually one uni- 

 form color but sometimes banded with white; 

 surface marked with distinct revolving 

 lines and grooves; whorls four to five, con- 

 vex. Length 12 mm. 



Separated from L. obtusata by the 

 higher spire, the striated surface and the 

 angle of the lip in front. It is also a 

 rock shell preferring the open coast. 



PI. 37, Fig. 23 



PI. 70, Fig. 6 



Labrador to New Jersey 



SDBGENOS MELARAPHE "Megorle von Muhl- 

 feld" Menke 1828 



LITTORINA ANGULIFERA Lamarck (L. scabra of 

 authors). Keeled Periwinkle. Shell quite 

 thin, whorls well rounded, spire sharply 

 produced; surface covered v ' th fine en- 

 graved lines and slightly decussated by the 

 growth lines; aperture oval; periphery usu- 

 ally carinated. The color varies greatly. 

 Gray, purple, yellow or red examples occur, 

 often with darker oblique markings which 

 are sometimes very faintly present. Length 

 1.25 inches. 



In Angelfish Creek, on the Florida 

 Keys, this species occurs in great numbers, 

 living upon mangrove branches above but not 

 distant from the water. It often lives 

 upon old piles and wharfs in p-otected 

 places. 



PI. 37, Fig. 5 



St. Augustine, Florida to West In- 

 dies; west to Texas; Central Ameri- 

 ca; Pacific 



LITTORINA ZICZAC Gmelin. Striped Periwin- 

 kle. Whorls hardly rounded, well-marked 

 keel near base of final whorl; entire sur- 

 face covered with lightly imposed and wide- 

 ly spaced grooves; lip projecting above the 

 keel; aperture small. Color whitish, wavy 

 stripes of brown color. Sometimes there is 

 present a faint band; interior dark. Length 

 6-12 mm. The commonest rock Littorina in 

 Florida. 



PI. 37, Fig. 24 



Southern Florida and West Indies 



LITTORINA ZICZAC LINEATA Lamarck. Whorls 

 more convex than the preceding, keel less 

 distinct and color pattern less pronounced; 

 grooves strong. Length 12 mm. 



PI. 37, Fig. 15 



Jupiter, east Florida to West 



Indies 



GENDS TECTARIUS Valenciennes 1833 



Solid, subconic shells with spines 

 or tubercles; operculum paucispiral. 



TECTARIOS MURICATDS Linne. Shell perforate; 

 eight rounded whorls which are slightly 

 shouldered above; surface sculpture of 

 about four rows of sharp nodules, five to 

 eight on the base and fading out near the 

 umbilicus; color grayish white or yellow- 

 ish, interior light chestnut; outer lip 

 strengthened, groove down columella from 

 umbilicus. Length 1 inch or less. 



Near Boca Raton, Palm Beach County, 

 this species lives shortly above to 25 feet 

 above high-tide mark in coral-rock cup- 

 sliaped depressions, possibly excavated by 

 the Tectarius. 



Quoy reports the radula as being 

 seven times the length of the shell. Pils- 

 bry records a specimen of this species 

 which revived after being isolated in a cab- 

 inet for a year. 



PI. 37, Fig. 6 



Jupiter Inlet, east Florida around 



Keys to west Florida; Bermuda; West 



Indies 



TECTARIUS TRGCHIFORIvIIS Dillwyn. Shell im- 

 perforate; eight whorls; sculptured with 

 revolving rows of sharp nodules; two more 

 distinct rows on upper whorls, one below 

 suture and another lower forming a shoulder. 

 On the last whorl there are three more 

 prominent rows, the two lower forming a 

 double keel on the periphery. In addition 

 to these there are revolving threads. The 

 color is usually lead, the nodules lighter, 

 interior dark, striped below. Length 18 mm. 



The dark epidermis, covered with 

 algae, make these little mollusks rather 

 difficult to see on the rocks where they 

 usually live near the high-tide mark. They 

 are often very common and associated with 

 the preceding species although nearer the 

 water where touched by the spray. It lives 

 chiefly upon the lower Florida Keys. 



PI. 38, Fig. 20 



Lower Florida Keys 



GENUS ECHINELLA Swainson 1840 



ECHINELLA NODULOSA Gmelin. Often confused 

 with the preceding but provided with a 

 multispiral operculum which in T. trochi- 

 formis is paucispiral. It is abundant on 

 rocks at Boca Raton, Florida, and elsewhere. 



