PANAMIC-PACIFIC PELECYPODA 211 



Differs from L. linqualis and L. lampra by much smaller size and 

 strongly oblique form. 



Range — Mazatlan, Mexico to Ecuador. Ecuador: Punta Blanca. 



Lucina (Cayillnga) linqualls Carpenter Plate 31, figure 11 



Lucina linqualis Carpenter, 1864, Ann. and Mag. Nat. History, ser. 3, vol. 13, p. 313 



"Cape St. Lucas, Lower California". Carpenter, 1872, reprinted in Smith. Misc. 



Coll., No. 252, p. 211. 

 Phacoides (Cavilucina) linqualis (Carpenter), Dall, 1901, Proc. U. S. Nat. Museum, 



vol. 23, No. 1237, p. 827, pi. 39, fig. 7. 

 Lucina (Cavilinga) linqualis Carpenter, Hertlein and Strong, 1946, Zoologica, vol. 31, 



pt. 3, p. 113. 



Shell small (height about 13 mm.), tongue-shaped, higher than long, 

 solid, white. Dorsal areas obscure, the posterior one somewhat stronger and 

 flattened. The small beaks are subcentral, pointed forward. Surface sculp- 

 tured with fine concentric threads, often irregularly interrupted by deep, 

 resting sulci. Ventral margins crenulated. 



Range — Lower California and the Mexican coast. 



Lucina (Cavilinga) lampra (Dall) Plate 31, figure 12 



Phacoides (Cavilucina) lamprus Dall, 1901, Proc. U. S. Nat. Museum, vol. 23, No. 1237, 



pp. 811, 827, pi. 39, fig. 9 "La Paz, Lower California". 

 Lucina (Cavilinga) lampra (Dall), Hertlein and Strong, 1946, Zoologica, vol. 31, pt 



3, pp. 112, 113. 



Shell small or of medium size (length about 24 mm.), rounded, 

 dosinoid, solid, slightly convex, the dorsal areas inconspicuous, white or 

 suffused with yellow or pink, strongest within. Beaks small, subcentral, 

 placed above a small, excavated lunule, usually restricted to the right valve. 

 Surface marked with fine, sharp, concentric threads and in the older speci- 

 mens by an occasional deeper, resting sulci; radials consist of submicro- 

 scopic striations. Ventral margins minutely crenulated. 



Length 23.5 mm., height 23.5 mm., diameter 10.5 mm. 



Recognized by its rounded form and fairly large size for the subgenus. 

 Range — Gulf of California. 



Subgenus BELLUCIN'A Dall, 1901 



Type species by original designation, Parvilucina eucosmia Dall (== 

 Lucina pisum Reeve). 



Shell generally small, suborbicular. Dorsal areas well defined, the lunule 

 small and deeply excavated. Sculpture coarsely cancellate, produced by 

 intersecting radial riblets and concentric lamellae. 



Lnclna (Bellnclna) cancellarls Philippi Plate 31, figures 4-4b 



Lucina cancellarls Philippi, 1846, Zeit. f. Malakozool., p. 21 Mazatlan. 



Phacoides (Bellucina) cancellaris (Philippi), Dall, 1901, Proc. U. S. Nat. Museum, vol. 



23, pp. 814, 829, pi. 39, fig. 11. 

 Bellucina cancellaris (Philippi), Maxwell Smith, 1944, Panamic Marine Shells, p. 57, 



fig. 727. 

 Lucina (Bellucina) cancellaris Philippi, Hertlein and Strong, 1946, 2^oIogica vol 31 



pt. 3, No. 8, p. 112. 



