MARINE MOLLUSCA OF THE UNITED STATES. 171 
Genus KELLIA, Turton. 
Brit. Bivalves, 57. 1822. 
The animal has a very short posterior siphon: anal tube undi- 
vided, entire below. 
1. K. PLANULATA, Stimpson. Fig. 432. 
Shells of New Eng., 17. 1851. 
Kellia rubra, Gould (not Montagu), Invert. Mass., edit. i. 60. 1841. 
Shell minute, rather thick, suboval; beaks prominent, in contact, 
with a well-defined lunule in front of them; anterior, white, with 
a thin purplish epidermis. 
Length 4, height 3 mill. 
New England. 
More compressed and longer than the next species. 
2. K. suBsorBIcuLARIS, Montagu. Figs. 433, 434, 435. 
(Mya.) Test. Brit., 39, 564, t. 26, £6. 1808. 
Shell quadrangular or rounded, swelled, thin and fragile; white 
with a very thin somewhat iridescent epidermis; beaks nearly 
median, small, pointed, inclining inwards rather than forwards; 
no lunule. 
Length and height 8 mill. 
New England. (N. Eur.) 
f Genus TURTONIA, Hanley. 
Brit. Moll., ii. 81. 1849. 
Anal siphon slender and produced. Foot large, heeled. 
1. T. niTipA, Verrill. Figs. 438, 439. 
Am. Journ. Sci., iii. 286, t. 7, f. 4, 4a. 1872. 
T. minuta, Gould (not Fab.), Invert. Mass., edit. ii. 85, f. 395. 1871. 
Shell minute, ovate, rather convex, fragile, semitransparent, 
beaks at about the anterior third, elevated, inclined forwards; 
smooth, straw-colored, blending into dark-purple at the beaks and 
posterior slope; anterior margin broadly rounded, posterior 
margin more acutely rounded. 
Length 2, height 1.7 mill. 
Found in crevices of shells and rocks, and among the roots of 
sea-weeds. 
Northern Coast. 
