154 ARCADJ;. 



Found in the stomachs of codfish in Casco Bay, in great numbers 

 (^Mighels) ; whole coast, lamhiarian region {Stimpson). Abundant 

 on sandy and muddy bottoms. Cape Ann, thirty fathoms ; Race 

 Point, twenty-two fathoms ; Broad Sound, six fathoms ; Grand 

 Manan {Stimpson) ; Greenland i^Mbrch). 



The animal has the mantle freely open, forming no siphons ; the 

 foot large, hyaline, with a deep fissure and serrated edges, protruded 

 from the longer side. It is very active (^Stimpsoii). 



Distinguishable from other species by its small size and tumid, 

 almost globose form, as well as by the number of teeth. 



Ocmis YOLDIA, Moller. T832. 



Shell oblong-ovate, compressed, rostrate posteriorly ; with fine 

 concentric or oblique striae, covered with a varnished epidermis ; 

 slightly pearly within. Pallial impression with a small sinus. An- 

 imal with a large foot, mantle open and ciliate, siphons adnate, long, 

 and very slender. 



Yoldia limatula. 



Fig. 62. 



Shell oblonfr-ovate, rostrated, very smooth and shining; beaks sub-central; 

 teeth twenty-two on the anterior, and eighteen on the rostrated side. 



Nucula Vmatula, Say, Amer. Conch, pi. 12 (1831). — Gould, Tnv. Mass. 1st cd. 98, fig. 



62. -De Kay, Nat. Hist. New York, 180, pi. 12, fig. 218. — Conrad, Amcr. Mar. 



Conch. 30, pi. 6, fig. 1. — Hanley, Biv. 170, pi. 20, fig. 4. — Sowerby, Thesanr. 



Conch. (Nucithi), pi. 1, fig. 9. — MiGHELS, Cat. Shells of Maine, 16, and in Bost. 



Joiirn. Nat. Hist. iv. 322. 

 Yoldia hmatula, Adams, Gen. ii. 548, pi. 126, figs. 5, St. — Chenu, Man. de Conch, ii. 



180, fig. 90.5. 

 Leda Ihna/nla, Stimpsox, Shells of New England, 10 (18.51 ). — S. Smith, Moll, of Long 



Island, 15, and in Ann. N. Y. Lye. vii. 



Shell transversely ovate, very much elongated, thin, lines of 

 growth very minute, otherwise smooth and covered with a Ijeauti- 

 fuUy glazed, light green epidermis, with an occasional darker zone, 

 and two or three lighter radiations ; beaks nearly central, not promi- 

 nent, inclined backwards ; hinge-margin behind rectilinear nearly 

 to the tip, compressed, the comi)ression not reaching the tip, which 

 is a little recurved, pointed, and not truncated ; anterior and basal 

 margin almost regularly rounded, entire ; interior bluish-white, 



