MARINE MOLLUSCA OF THE UNITED STATES. 165 
6. A. LUTEA, Perkins. Fig. 418. 
Proc. Bost. Soc. Nat. Hist., xiii. 151, figure. 1869. 
Shell gibbous, thick, subtrigonal, length and breadth nearly 
equal; beaks prominent, incurved, not meeting; surface with 
twenty or more concentric ridges; margin crenulated within. 
Length 23, breadth 21 mill. 
Connecticut. 
Animal with light yellow mantle, edged with bright orange ; 
foot bright orange, striped longitudinally with yellow. Ovaries 
full of bright orange ova in April. 
A somewhat doubtful species; its form too close to that of 
borealis. 
7. A. sutcaTA, Da Costa. Figs. 419, 420. 
(Venus.) Brit. Conch., 192. 1778. ' 
Crassina Danmoniensis, Lamarck, Anim. s. Vert., edit. Deshayes, vi. 360. 
Astarte undata, Gould, Invert. Mass., 80. 1841. 
Astarte latisulea, Hanley, Desc. Cat. 87, t. 14, f. 85. 1848. 
Shell ovate-triangular, thick, somewhat compressed ; anterior 
side somewhat shortest ; beaks in contact, obtusely pointed; sur- 
face with from ten to twenty concentric furrows and ridges, the 
former wider than the latter. Epidermis dark brown. Hinge 
margin crenulated. 
Length 31, height 25 mill. 
New England, northwards. 
Doubtful Species. 
’ 8. A. LUNULATA, Conrad, Foss. Tert. Form., 44, t. 21, f. 8. 
A. bilunulata, Conr. Adams. Genera, ii. 484. 
This species is inserted in Stimpson’s Check-List of Atlantic 
Coast Shells, but I think it exceedingly improbable that it has 
been correctly identified with any living species. 
Genus GOULDIA, C. B. Adams. 
1. G. MAcTRACEA, Linsley. Fig. 421. 
(Astarte.) Gould, Am. Journ. Sci., 233. 1849. 
Shell small, solid, trapezoidal or quadrant shaped, triangular 
above, rounded below; surface undulated by about fourteen con- 
centric waves or ribs, with very minute radiating striz. Color 
yellowish-green. 
Length and height 6 mill. 
Massachusetts to South Carolina. 
