PANAMIC-PACIFIC PELECYPODA 37> 



the left valve has two small, distinct lateral teeth (mainly enlargements 

 of the valve margins) which fit into two, strong, lateral sockets in the 

 right valve; the lower edge of each lateral socket in the right valve is en- 

 larged and toothlike but these are merely subsidiary thickenings, since there 

 are no sockets opposite them in the left valve for their insertion. The pallial 

 sinus is large and deep but does not reach across to the anterior adductor 

 scar; its lower limb is partially confluent with the pallial line below. 



Tellina (Tellina) cnmingii Hanley Plate 68, figure 13; 



Plate 69, f gure 3 



Tellina cumingii Hanley, 1844, Proc. Zool. Soc. London, p. 59 Guacomayo, Central 

 America.— Hanley, 1847, Tiies. Conch, vol. 1, Tellina, p. 223, sp. 3, pi. 58, fig. 72. 



Tellina {Tellinella) cumingii Hanley, Hertlein and Strong, 1949, Zoologica, vol. 34, pt. 

 2, p. 65. 



Shell of medium or large size (length up to about 72 mm.), elongate, 

 solid, the beaks nearly median, the anterior side subelliptical, straight along 

 the dorsal side, strongly obliquely rounded at the end, the posterior side 

 narrowed and sloping, strongly flexed. The left valve is more convex, the 

 right is flattened or depressed across the posterior side of the middle. The 

 posterior side has a strong rostral zone which in the right valve has two, 

 coarsely scabrous ridges, while in the left valve, this area is lower, only the 

 dorsal ridge is strongly scabrous. General sculpture is formed by narrow, 

 concentric ribbons, between incised lines, rounded or shelving on the an- 

 terior portion of the disk, sharper and more elevated on the posterior; 

 where these lamellae cross the rostral area, in the right valve, they become 

 stronger and squamose. Color a cream-white, often in banded zones of shade 

 with scattered narrow rays of brown. 



Length 72.5 mm., height 30.4 mm., diameter 15 mm. Pearl Islands, 

 Panama. 



A beautiful and generally rare species. 



Range — Gulf of California to Ecuador. Panama: Pearl Islands (Lee 

 Bell). 



Tellina (Tellina) zacae Hertlein and Strong Plate 69, figures 4, 4a 



Tellina (Tellinella) zacae Hertlein and Strong, 1949, Zoologica, vol. 34, pt. 2, pp. 65, 

 66, pi. 1, figs. 12, 13, 17. 



Shell of medium size (length about 34 mm.), elongately ovate, the 

 umbones placed a little behind the middle, white, with golden-orange rays 

 of varying size. Anterior end elliptically rounded, the posterior side shorter, 

 the surface sculptured with strong concentrlcs which become squamose 

 as they cross the rostral ribs. 



Length 33.4 mm., height 15.2 mm., diameter, both valves 7.8 mm. 

 (Hertlein and Strong) 



Similar to Tellina cumingi but differs in being smaller, higher, its 

 posterior side shorter and in some other details. 

 Range — Gulf of California. 



Genus PHTLLODINA Ball, 1900 

 Type species by original designation, Tellina squamifera Deshayes. 

 Recent, western Atlantic. 



Shell broadly elongate, subequllateral, the two ends nearly alike. The 

 posterior side has a wide rostral area, weakly flexed. Concentric sculpture 



