EAST COAST MARINE SHELLS 



41 



at once apparent. It has been found abun- 

 dantly off the Maine coast and Rhode Is- 

 land. It probably lives in sand at low- 

 water mark. Reported depths range from 

 3-16 fathoms. 



PI. 12, Fig. 7 



Labrador to North Carolina 



Family Pandorldae 



Shell irregular, compressed, 

 pearly. 



GENOS PANDORA Hwass 1795 

 (GRECIAN EVE) 



Shell inequi valve; right valve 

 flat, left convex; two diverging teeth in 

 right valve and grooves in the opposite 

 one. 



PANDORA GOULDIANA Dall. A large roxigh spe- 

 cies in contrast to P. trilineata. Length 

 25 mm. Range 0-30 fathoms. 



PI. 13, Fig. 7 



PI. 76, Fig. 1 



Nova Scotia to Cape Hatteras, 



North Carolina 



PANDORA TRILINEATA Say. Shell white, of- 

 ten with iron-like deposit near hinge line; 

 brilliantly nacreous internally. 



Often confused with the preceding 

 species. It is much more fragile and beau- 

 tiful. Length 20 mm. 



Fig. 30, page 26; PI. 76, Fig. 4 

 New Jersey to Gulf of Mexico 



Family Lyonslldae 



Shell inequivalve, subtriangular , 

 fragile, pearly; hinge provided with a 

 narrow ledge inside each valve to which 

 the ligament Is attached and against which 

 adheres a four-sided plate. 



GENUS LYONSIA Turton 1822 



LYONSIA FLORIDANA Conrad. Shell narrower 

 and often smaller than L. hyalina, ends 

 somewhat pointed. Length 8-15 mm. 



PI. 13, Fig. 1 



Florida and Gulf of Mexico 



LYONSIA HYALINA Conrad. Glassy Lyonsia. 

 A translucent, pearly, fragile shell, cov- 

 ered with ray-like wrinkles; plate a tr\jn- 



cated wedge. Length 18 mm. Animal with 

 slender foot which is deeply grooved. 

 Fig. 29. 



The radiated wrinkled surface is 

 unique among shells of the New England 

 coast. It is a form of epidermis. The 

 pearly lustre is equally beautiful. It is 

 a shallow water species. 



PI. 13, Fig. 2 



Nova Scotia to Texas 



SECTION PHILIPPINA Dall 1901 



LYONSIA BEANA Orbigny. Shell small, rath- 

 er thin, surface shining, decidedly in- 

 equilateral, gaping below. Length 17 mm. 



This is the only representative of 

 the family, in these waters, which exhib- 

 its color. It was originally collected by 

 M. Beau but the name misspelled in the de- 

 scription. 



PI. 13, Fig. 3 



North Carolina to Florida; West 



Indies 



Family Cuspldariidae 



GENUS CUSPIDARIA Nardo 1840 

 (Naera Gray 1834) 



Shell small, rostrate, sculptured 

 or smooth; radial sculpture most prominent. 



CUSPIDARIA GEMMA Verrill and Bush. Shell 

 thin, quite small, fragile, bluish white; 

 rostrum distinct; lambone smooth; ventral 

 margin broadly rounded with slight angle at 

 termination of each radial rib; three of 

 these ribs upon posterior half and one less 

 distinct at about the center, the latter 

 rib rudimentary in left valve, none of the 

 ribs reaching the umbones; hinge margin 

 thin and delicate; right valve with small 

 long lateral tooth separated from minute 

 cartilage plate by a distinct notch; lat- 

 eral tooth supported by a small buttress. 

 Length 5 mm., height 3 mm. 



This striking little shell was de- 

 scribed from specimens dredged in 16-17 

 fathoms off Cape Hatteras. The writer 

 found it in shallow water near Jupiter 

 Light and upon the bay side at Sanibel, 

 Florida. It doubtless will turn up in oth- 

 er localities. 



PI. 13, Fig. 5 



Cape Hatteras, North Carolina to 



Florida 



