EAST COAST MARINE SHELLS 



35 



and shading to white in the lower centres. 

 Height 4.5, length 4.75 inches. 



A very handsome shell not infre- 

 quently brought in by the Greek sponge 

 fishers at Tarpon Springs on the west coast 

 of Florida. 



PI. 8, Fig. 3 



PI, 28, Fig. 5 



PI. 9, Fig. 6 



North Carolina to Gulf coast of 



Florida 



PECTEN NODOSDS FRAGOSUS Conrad. Differs 

 from the preceding in having fewer and 

 much larger ribs, narrower interstices 

 with transverse "laminae and in flatness of 

 inferior valve; ribs eight, of which six are 

 very large. Length 2 inches, height the 

 same. 



Cedar Keys, Florida to West Indies 



PECTEN ANTILLARUM Recluz. Antillian Scal- 

 lop. Shell equivalve, convex-depressed; 

 ribs ten to eleven, color variable, green- 

 ish inside; ears subequal, old ones ab- 

 breviated. The young shell is thin and 

 glistening, the old worn and resembling P. 

 siilcatus. The nodes are often absent. 



This species was described from a 

 Guadeloupe specimen. Range 0-127 fathoms; 

 recently obtained in shallow water off the 

 Florida Keys. Height 15 mm. 



PI. 8, Fig. 6 



PI. 9, Fig. 7 



Florida Keys and West Indies 



SUBGENUS PLACOPECTEN Verrill 1897 



PECTEN GRANDIS Solander (P. magellanica 

 Gmelin) . Giant Scallop. A strong opaque 

 shell when mature, thin and translucent 

 when young; lower valve nearly flat, white; 

 upper valve moderately convex, brown or 

 flesh color; valves gaping near hinge; 

 sculptured with radiating lines or grooves, 

 crossed by lines of growth, upon convex 

 valve scalloped over the radiating lines; 

 ears equal, notch in lower valve rounded; 

 interior white, smooth, shining, with 

 small radiating lines not equal to those 

 outside. Length 5-6 inches, height slight- 

 ly more. 



It is most plentiful off the coast 

 of Maine but fresh complete specimens were 

 taken by the writer at Rockaway Beach, New 

 York City. Range in depth 10-100 fathoms. 



PI. 7, Fig. 4 

 , Labrador to North Carolina 



SUBGENUS PSEUDAMUSIUM Morch 1853 



PECTEN IMBRIFER Loven. A vitreous white 

 little shell, often with a grayish discol- 

 oration. Alt. 18.5 mm. 



PI. 62, Fig. 4a, b 



Arctic Seas; N. E. United States 



PECTEN SIGSBEEI Dall. A plump, oval lit- 

 tle shell; shaped like an apricot stone; 

 surface without radiating sculpture. Alt. 

 11.5 mm. Depth 158 fathoms. 



PI. 62, Fig. 2 



Florida Strait 



SUBGENUS AMUSIUM Roeding 1798 



Shell smooth or slightly sculp- 

 tured outside; radiating ribs inside; 

 valves gaping at sides; ears small; shell 

 free (byssif erous?) . 



The name Amusiuim has been in use 

 more than two hundred years. Its first bi- 

 nomial appearance (1798) was in an illus- 

 trated catalog following the Bolten system 

 with references by Roeding who is now 

 recognized as the author of the species 

 enumerated. 



AMUSIUM DALLI E. A. Smith. An extremely 

 thin, fragile and brittle shell. Alt. 62 

 mm.. Ion. 59 mm., diam. 6 mm. Taken in 

 218-860 fathoms. 



PI. 62, Figs, la, lb 



Gulf of Mexico; West Indies 



AMUSIUM POURTALESIANUM MARMORATUM Dall. The 

 typical form is pale and translucent; the 

 variety with brilliant mottling of orange 

 red, yellow or brown and combined with 

 opaque white flecks. Alt. lo.5 mm. Range 

 13-805 fathoms. 



PI. 62, Fig. 3 



Florida Strait; Gulf of Mexico 



Family Limidae 



Shell equivalve, white or yellow- 

 ish, compressed; anterior end straight; 

 posterior end rounded, usually close; um- 

 bones separated, eared; valves smooth, 

 ribbed or imbricated; muscle impression 

 large and double. 



