78 



EAST COAST MARINE SHELLS 



aperture rounded, slit in the margin; oper- 

 culate. Slit absent in Juvenile specimens. 

 They have been found in Piedmont on sea- 

 weed. 



Animal with long tentacles, usual- 

 ly pale and translucent. The group is re- 

 lated to the large slit shell (Pleuroto- 

 maria) which lives in the West Indies, a 

 member of a family which is almost extinct. 



SCISSURELLA CRISPATA Fleming. Length 4 mm. 

 Range 4-790 fathoms. 



PI. 68, Fig. 15 



Greenland to New Hampshire 



Family Haliotldae 



Shell spiral, often ear-shaped; 

 aperture very large, nacreous; holes or 

 notch upon outer lip; operculum lacking. 



GENUS HALIOTIS Linne' 1758 



Shell ear-shape, spire small, aper- 

 ture iridescent and very wide; exterior 

 dull, perforated by a series of holes, the 

 earlier ones closed; horseshoe-shaped mus- 

 cle impression. 



Foot very large, powerful and suit- 

 ed to clinging on rocks. 



Haliotis is abundant on the Pacific 

 coast of the United States, also Japan, the 

 Channel Islands and elsewhere. Only one 

 species is known from the east coast and 

 that from deep water. 



HALIOTIS POURTALESII Dall. "Shell longer 

 than wide, holes seventeen, the last five 

 open; surface sculptured with fine spiral 

 lines developing gradually into waving spi- 

 ral threads, with finer threads appearing 

 and continuing to edge of aperture; color 

 wax-yellow with deeper patches of orange; 

 nacreous shining within." Length 11 mm. 



In 1869 a series of shells were ob- 

 tained by the D. S. Fish Commission Ship 

 Bibb, under the direction of Count Pourtales, 

 in the Straits of Florida. When this ma- 

 terial was sent to the National Museum in 

 Washington Dr. Dall was surprised to find a 

 Haliotis in the lot. The specimen was sent 

 to Chicago and destroyed in the great fire 

 there. Twenty years later Dr. Dall de- 

 scribed it from memory. In 1913 John B. 

 Henderson, while dredging from his boat the 

 Eolis along the inner edge of the Pourtales 

 Plateau, secured a small and somewhat imma- 



ture Haliotis. Dr. Dall pronounced this 

 identical with the example taken so many 

 years before. The illustration herewith 

 represents the second specimen. Obtained 

 at a depth of 90 fathoms. 

 PI. 29, Fig. 3 



3 miles off Sand Key, on edge of 

 Pourtales Plateau, Florida 



Family Trochidae 



Shell nacreous inside; aperture en- 

 tire; lip generally not continuous. Oper- 

 culum thin, entirely corneous and multi- 

 spiral. 



GENUS TEGULA 

 Swain. 



Lesson 1832; Chlorostoma 

 1840 (ROOF TILE) 



Distinguished by a prominent callus 

 which extends from the inner lip to and 

 often covering the lambilicus. There are 

 from one to several teeth at the base of 

 the columella. 



TEGULA FASCIATA Born. Differs from others 

 in the genus by the smooth surface and lack 

 of sculpture; ground color yellow with red, 

 black or brown arranged in diverse patterns; 

 two teeth at base of columella with white 

 callus above. Length 16 mm. 



Taken by the writer in six feet of 

 water upon weeds on Featherbed Bank, Lower 

 Biscayne Bay, Florida; also off Lignumvitae 

 Key. It is an abundant and well-distribut- 

 ed form on the Florida Keys. 



PI, 31, Fig. 4 



Florida Keys; West Indies 



TEGULA SEMIGRANOSA A. Adams. Shell coni- 

 cal, umbilicate; sutures not impressed; 

 ground whitish with irregular flames, lines 

 and dots of yellow; whorls five to six, en- 

 circled by many close-set spiral lines 

 which are irregularly crenulated, ten to 

 twelve of these on last whorl above periph- 

 ery; base a little convex and with eight 

 lines similar to those above; aperture ob- 

 lique; umbilicus deep, large, edge ending 

 in a tooth at base of columella, two addi- 

 tional smaller teeth below. Diameter 16 mm. 



PI. 29, Fig. 4 



Palm Beach, Florida to West Indies 



GENUS LIVONA Gray 1842 

 Shell large, solid, surface spotted. 



