242 BULLETIN OF THE 



back toward the lower edge of the posterior adductor. On this band between 

 the adductors are the gills, two on each side. There are three long filaments 

 and several granulations and pigmented dots on the mantle edge near the anal 

 orifice. The rest of the edge is nearly smooth. On each side of the anus is 

 a prominent whitish lobule, from which a tube seems to pass back over the 

 adductor and a shorter one toward or into the anal tube near its orifice. 



Area lienosa Sat. 

 Area lienosa Say, Am. Conch., IV. pi. xxxvi. fig. 1, 1832. 



One young specimen was dredged in 19 fms., west of Florida. The Fish 

 Commission has dredged in deeper water dead valves of this species measuring 

 115.0 mm. long., 65.0 mm. high, and 35.0 mm. in diameter (or 70.0 mm. for the 

 whole shell). These had about 38 ribs, narrow and sharply grooved on top 

 except in the older third where they were entire and uniformly closely trans- 

 versely waved. The epidermis is soft, profuse, moderately long, and dark 

 brown. The teeth are small, vertical, uniform and close set. The young are 

 sometimes sharply auriculate. The anterior outer margin of the area is not 

 covered with the black cartilage, which creeps up more and more in the middle 

 line, as the shell grows; thus producing a marked difference between young 

 and old. 



Area reticulata Chemnitz. 



Area auricidata Chemnitz, Conch. Cab., VII. p. 193, t. 64, f. 540, 1784 ; Gmelin, S. N., 

 p. 3311, 1788; Dillwyn, Cat., I. p. 237, 1817 ; Lamarck, An. s. Vert., 2d ed., VI. 

 p. 475. 



Area squamosa Lam., An. 8. Vert., 1st ed., VI. p. 45, 1819. 



Area domingensis Lam., 1. c, p. 40, 1819 ; E. A. Smith, Chall. Rep., p. 265. 



Area elathrata Lam., 1. c, p. 46, 1819, fide Deshayes. 



Area elathrata Defrance, 1816, fide Nyst, Cat. Arc, 1848. 



Area gradata Broderip & Sowerby, Zool. Journ., IV. p. 365, 1829. 



"iArea congenita E. A. Smith, Chall. Rep., p. 265, pi. xvii. figs. 6, 6a. 



Byssoarca divarieata Sowerby, P. Z. S., 183.3, p. 18 ; Reeve, Conch. Icon., pi. xvi. 

 fig. 108. 



1 Area donaciformis Reeve, Conch. Icon., pi. xvi. fig. 104, 1844. 



Dreaged at Stations 65 and 66, ofi" Havana, in 80-127 fms. ; at Station 21, off 

 Cuba, in 287 fms., dead ; at Station 32, in 95 fms., in the Gulf of Mexico, living ; 

 and at Station 262, near Grenada, in 92 fms., fine sand, bottom temperature 62°. 

 It has not been found living from more than 100 fms. This well-known species, 

 usually named gradatu or domingensis, appears quite variable in outline, espe- 

 cially in the young. Some of my specimens approach so closely to the figure 

 of A. congenita that it has suggested the idea that that may be merely an ex- 



