62 Marink Shells of the Western Coast of Florida 



Chama niacerophjila"'-' Gmelin PI. 10, fig. 60 



Average alt., 40; length up to 90 mm. General characters those 

 of C. congregata, but larger and heavier, valves deeper and without 

 radiate ridges, and having the lamellar foliations fluted and more 

 developed on both upper and lower valves. Color forms vary through 

 shades of pink, yellow, and combinations of the two colors. Margins 

 crenate withm. 



Frequently adherent to valves of Atrina. 



Genus PSEUDOCHAMA Odhner, 1917 

 Psendochaina^'' radians variegrata (Reeve) PI. 10, fig. 61 



Alt., 40; length, 35 mm. Attached by right valve; spiral twist of 

 umbos to left when shell is viewed in attached position, umbos 

 slightly more promment than in Chama. Attachment to its support 

 often by lamellar processes instead of a flattened valve surface. 

 Sculpture of both ridges and foliations; internal margins finely cre- 

 nate; other characters typical of family. Pseudochama is seldom at- 

 tached to other shells. 



Taken about reefs in four to seven fathoms. 



Genus ECHIIVOCHAMA P. Fischer, 1887 

 Echinochama^i coniuta (Conrad) PI. 10, fig. 62 



Alt., 40; length, 35 mm. Shell thick, globular, white with brown 

 stains near umbos; equivalve; valves and umbo curve forward; wide, 

 deeply impressed lunule. Each valve bears seven or eight strong ribs 

 with erect, slender, tubular spines. Surface of both valves, including 

 lunule, covered with beadlike papillae. Hinge ligament partly in- 

 ternal. Each valve has one cardinal tooth. Interior white or purple; 

 two muscle scars, simple pallial line, margins scalloped and finely 

 crenate. Juvenile shells are attached by a small area near right 

 umbo; adults usually free. 



Family UNGILINIDAE^-^ 



The Ungulinidae is a small family with close affinities to the 



'■' Gr., macros, long in extent, with phylloti, leaf. 



''^ Gr., psfudes, false; Lat., radians, pres. part, of radiare, to emit rays; 



past part, of varicgare, to variegate. 

 ^'^ Lat., echinus, hedge-hog; arcus, bow, rlla, dim. suffix; cornutus, horned. 

 ^- Lat., ungula, claw, hoof. 



