238 PROCEEDINGS OF THE NATIONAL MUSEUM. vol.45. 



surface marked with irregular wavy, faintly impressed, and irregu- 

 larly distributed radiating lines, and fine concentric lines of growth. 

 The radiating lines are decidedly stronger on the lunule than on 

 any other part of the shell. Interior bluish white; within the 

 umbones an iridescent intensified canary yellow callus patch occurs, 

 which gradually becomes attenuated and diffused ventrally, extend- 

 ing weakly as far as the palial line. A rosy flush extends from a 

 little within the ventral border dorsally, over about two-thu'ds of 

 the inner surface of the shell. Resilium almost straight dorsally, 

 with a sigmoid curve ventrally. Hinge with obsolete lateral teeth 

 indicated, the anterior one of wliich is a little stronger than the 

 posterior. 



The type, Cat. No. 256975, U.S.N.M., was dredged at station 5173, 

 off Jolo Light, in 186 fathoms, on shell and coral bottom. It measures : 

 alt. 182 mm., lat. 135 mm.; diameter 52 mm. The smallest specimen 

 obtained. Cat. No. 254979, U.S.N.M., comes from station 5519 and 

 measures: alt. 63 mm., lat. 51 mm.; diameter 22.3 mm. The largest 

 specimen, Cat. No. 254978, U.S.N.M., comes from station 5371 and 

 measures: alt. 208 mm., lat. 156; diameter 59 mm. 



This species was obtained at the following stations: 



Station 5135, off Jolo Light (lat. 6° 11' 50" N.; long. 21° 08' 

 20" E.), in 161 fathoms, on fine coral sand bottom; bottom tempera- 

 ture, 57°.4. Cat. No. 254980, U.S.N.M. 



Station 5173, off Jolo Light (lat. 6° 02' 55" N.; long. 120° 53' 

 GO" E.), in 186 fathoms, on shell and coral bottom. Cat. No. 256975, 

 U.S.N.M. 



Station 5198, off Baliscasag Island (lat. 9° 31' 50" N.; long. 123° 

 39' 45" E.), in 220 fathoms, on green mud bottom; bottom tempera- 

 ture, 53°.9; density of water at bottom, 1.02500. Cat. No. 256975, 

 U.S.N.M. 



Station 5371, off outer Tayabas Light (lat. 13° 49' 40" N.; long. 

 121° 40' 15" E.). Sounding not made, depth taken from chart 

 which says 83 fathoms. (This is probably incorrect, for all the 

 other Giant Limas were taken at much greater depth.) Bottom 

 green mud. Cat. No. 254978, U.S.N.M. 



Station 5387, off outer Bagatao Island Light (lat. 12° 54' 40" N.; 

 long. 123° 20' SO" E.), ia 209 fathoms, on soft green mud bottom; 

 bottom temperature, 52°.4. Cat. No. 254976, U.S.N.M. 



Station 5503, off Macubalan Pomt Light, Mmdanao (lat. 8° 36' 

 26" N.; long. 124° 36' 08" E.), in 226 fathoms, on green mud bottom; 

 bottom temperature, 53°.3. . Cat. No. 254976, U.S.N.M. 



Station 5516, off Point Tagolo Light, Mindanao (lat. 8° 46' 00" N.; 

 long. 123° 32' 30" E.), in 175 fathoms, on globigerina bottom; 

 bottom temperature, 54°.3. Cat. No. 254974, U.S.N.M. 



