Veneridae 71 



Fig. 2. Diagram showing the characteristic features of Transenella. 



Transenella stimpsoni Dall PI. 13, fig. 79a 



Alt., 9.5; length, 13; diam., 6 mm. Shell small, trigonal, rounded, 

 moderate posterior rostration; milky white or bluish color with 

 brown streaks and chevron markings; umbos prominent, a little an- 

 terior to middle; smooth, oval lunule, defined by an incised line; 

 sculpture of fine concentric grooves; hinge typical, interior white 

 to purple, polished; pallial sinus extends to middle of valve; inner 

 margin obliquely engraved. 



Genus GAFRARIUM Roding, 1798 

 Gafrariumio3 cerina (C. B. Adams) PI. 13, fig. 80 



Alt., 10.5; length, 13; diam., 4 mm. Shell small, flattened, 

 trigonal, waxy cream color with zigzag pencillings of light brown; 

 umbos small, acute, almost central; fine concentric striations and 

 radiate striae over anterior and posterior areas; hinge with three 

 cardinal and one anterior lateral tooth in each valve; interior 

 polished, white, purple-tinted in umbonal region; pallial line with 

 slight posterior sinuation; margms smooth. 



Genus MACROCALLISTA Meek, 1876 

 Macrocallistai"* nimbosa (Solander) PI. 13, fig. 81 



Alt., 60; length, 115 mm. Shell smooth, thick, inequilateral, 

 elongate oval, pink-tinted fawn color with radiate block-patterned 

 bands of darker shade; thin, glossy epidermis; umbos depressed, 

 long external ligament; lunule impressed, oval, purplish. Faint con- 



103 Gr., root kop, to take, grasp; Lat., caper e, to take; Spanish, gaff a, 



hooking; ccrinus, wax-colored. 

 10* Gr., macros, long in e'xtent; Callisia, a nymph; Lat., nimbus, rain cloud. 



