402 Gould's Descriptions of Shells 
ANODON CICONIA. 
Anodon ciconia, Gould ; Proc. D. S. N. H., Nov. 1851. IV. 92. 
T. solidula, transversa, oblongo-ovata, ventricosa, epidermide lutescenti-cornea 
induta: apicibus ad trientem anticum long. sitis, eminentibus, acutis; latere 
antico angusto, rotundato; latere ree cines o, ad apicem acuto, margine 
dorsali haud angulato; margine ventrali iusculo, antic& hiante, declivitate 
postico tumido, haud angulato ; Peau « ex ide incarnata demum argen 
tea; cavositas apicalis ampla. 
Shell rather solid, transversely oblong ovate, ventricose ; epider- 
mis yellowish horn color: beaks at the anterior third, prominent, 
acute ; anterior half narrowed, the dorsal margin direct or a little 
concave, extremity rounded, a little above the middle; posterior 
half widening; dorsal edge at first a little arched, then obliquely 
truncate, but without forming an angle; tip acute ; ventral margin 
nearly straight, gaping anteriorly ; posterior umbonal slope tumid, 
and not angulated. Nacre ochreous, tinted flesh color on the disk, 
becoming silvery at margin ; cavity of the beaks capacio 
Length four inches ; height two and three eighths see “breadth 
one and one fourth Pu 
From the Collection of Lieut. Green, and marked “ Mexico (?).” 
a is evidently an equatorial type, and closely resembles A. anse- 
a, from Brazil. It is thicker in substance, more tumid on the 
aie half, the epidermis and nacre are quite differently colored. 
The posterior dorsal and ventral margins have a corresponding 
slope, a little arched, and come together at the middle of the alti- 
tude. It is more like A. implicata than any other North American 
species. 
MYTILUS GLOMERATUS (Pl. XVI. Fig. 8.) 
Mytilus glomeratus, Gould; Proc. B. S. N. H., Nov. 1851. IV. 92. 
T. parva, solidula, arcuatim oblongo-ovata, nitida ex indicá nigrescens, ees 
tice obtusa ; apicibus remotis, excurvatis; valvis ventricosis oblique entrali ree 
e ligamentali recto, demum subito arcuato; margine ventra — 
excavato; cardo alterá valvà dentibus duobus, alterà tribus; intus 
ie ad ade nigra incrassata et radiatim striata; cicatricibus profundis 
f 
Shell small, oblong ovate, arcuate, rather solid, shining, srie ot 
growth conspicuous, deep indigo blue jii into PM black, at 
