ARCIDAE 343 



ment moderately developed. This species was also named Candida Gmelin, 

 jamaicensis Gmelin and helblingi Brug. Common, attached under stones. 



Barbatia cancellaria Lamarck Red-brown Ark 



Plate zyq 



Southern Florida and the West Indies. 



I to 1% inches in length, similar to B. Candida, but with low, cancel- 

 late sculpture and colored a dark, purplish brown. This is a common species 

 which is erroneously called B. barbata Linne (a Mediterranean species). 



Subgenus Acar Gray 1857 

 Barbatia dontingensis Lamarck White Miniature Ark 



Plate 27U 



North Carolina to Florida and the Lesser Antilles. 



^ to % inch in length, somewhat box-shaped, whitish in color and with 

 no appreciable periostracum. Similar in shape and sculpture to Arcopsis 

 adamsi, but instead of having a small, triangular ligament between the beaks, 

 domingensis has a very narrow, long ligament posterior to the beaks. The 

 posterior end is usually larger than the anterior end and characteristically 

 dips slightly downward. Common at low tide under rocks. Erroneously 

 called Area reticulata Gmelin by Dall and others (see Lamy and Woodring) . 



Barbatia bailyi Bartsch Baily's Miniature Ark 



Santa Monica, California, to Gulf of California. 



A little over ^ inch in length, oblong to squarish, fat; cancellate sculp- 

 ture in which the beads become foliate at the posterior end. Ligament small, 

 narrow and placed well posterior to the fairly close beaks; about 15 teeth. 

 Color white to brownish white. 



Very common in certain localities under stones at low tide. A. pernoides 

 Carpenter was thought to be this shell but is apparently some other much 

 larger species of unknown identity. 



Subgenus Fugleria Reinhart 1937 

 Barbatia tenera C. B. Adams Doc Bales' Ark 



Plate 27k 



Southern half of Florida to Texas and the Caribbean. 



I to I >2 inches in length, thin-shelled, rather fat and evenly trapezoidal 

 in shape and with numerous rather evenly and finely beaded, thread-like ribs. 

 Ligamental area fairly wide at the beak end, becoming narrow at the other. 



