74 Marink Shells ok the Western Coast of Florida 



Chioiie granulata'ii (Gmeiin) PI. 41, fig. 296 



Alt., 21; length, 24; diam., 12 mm. Shell with characters of the 

 genus. Yellowish-cream color with four radiatmg bands of purple 

 brown; squarish spots and indefinite dark markings; thin epidermis; 

 umbos small; lunule small, ribbed; numerous radiate ribs of curious 

 structure; posterior side of each rib rises to an angle of about 45 

 degrees from plane of valve surface to meet the anterior elevation 

 of rib which rises at an angle of about 15 degrees; crest of rib is 

 sharply angled. The angular ribs are cancellated by closely, impressed 

 sulcations; sculpture less pronounced in central area; mterior purple. 

 Margins plicate in accord with ribs. 



Chione grus^^- Holmes PI. 14, fig. 88 



Alt., 7; length, 10; diam., 5 mm. Shell small, transversely oblong, 

 inequivalve, grayish white with brown pencillings, a broad ray of 

 purplish brown at posterior border; thm epidermis, shaggy at post- 

 erior margin; small lunule, brown; obscure escutcheon; surface 

 cancellated by radiate and concentric ribbing. Interior white, deep 

 purple at posterior border; pallial sinus oblique, angular; margins 

 finely crenate. 



The animal has two united, henna-colored, fringed siphons. 



Genus MERCENARIA Schumacher, 1817 



Merc'PnarIa 1 ' '' cainpeehiensisn^ (Gmeiin) {Venus campcchiensis Gmeiin] 



PI. 14, fig. 89 



Alt., 100; length, 110 mm. represents size of average adult shell, 

 individuals attain much greater dimensions and considerable weight; 

 shell grayish white, heavy, thick, solid and porcelanous; inequivalve; 

 umbos far forward; strong external ligament; lunule and escutcheon 

 well defined; margins rounded; sculpture of close, lamellar, concen- 

 tric ridges; hinge margin thick, with strong cardinal teeth and a 

 rugose area in each valve; interior smooth, white, often violet color 

 at anterior and posterior margins; pallial sinus small, angular; inner 

 margins crenulate. 



Mercenaria canipechieiisls (Gmeiin). .Juvenile PI. 14, fig. 90 



^^^ Lat., granum, grain. 

 '1- CJr., grus, gricrs, gritty, granulose. 

 ^^•^ Lat., mrrcrnarius, reward, money. 

 11* From Campeche, Mexico. 



