COMPLETE GRAU : PECTINIDAE OF THE EASTERN PACIFIC 117 



GULF OF CALIFORNIA: Coronados Islands, 100-120 fathoms, sta. 



523-36; Carmen Island, 25 fathoms, bottom sample 2188. 

 WESTERN LOWER CALIFORNIA: Punta Abreojos; 28-30 



fathoms, bottom sample 2199. 



Ghlamys (Leptopecten) euterpes (Berry) 1957 



Plate 39 



Pecten (Leptopecten) euterpes Berry, 1957, p. 75. "6-10 fms., off 



Acapuico, Mexico." 

 Aequipecten (Leptopecten) euterpes (Berry, 1957). Keen, 1958, p. 70, 

 fig. 127. 



Holotype: Stanford University. 



Type locdiity: 6-10 fathoms, off Acapuico, west Mexico. 



Original description: Shell small, thin, compressed, moderately 

 oblique; hinge long; ears large, the anterior slightly the wider and 

 ornamented by 7 to 9 finely lamellose radial threads; notch deep, sub- 

 acute ; ctenolium septemdentate ; posterior ear weakly furrowed, the ribs 

 nearly obsolete. Right valve with 17 to 19 low, rather broad, gently 

 rounded radial ribs set of? by incised lines; alternate ribs on the older 

 portion of the shell a little stronger and the 2 or 3 posterior ribs yet more 

 emphasized ; toward the antero-dorsal angle 3 or 4 ribs are narrower and 

 bear a delicately beaded keel on their ridges. Left valve a trifle more 

 convex, but similarly sculptured except that about every third rib a trifle 

 stronger than the others. Color either Acajou Red with a little dim 

 speckling, or clear Apricot Yellow, the right valve always a trifle the 

 lighter. Max. long, of holotype 7.4, alt. 7.1, max. diam. 2.0 mm. 



Type-Locality: 6-10 fms., off Acapuico, Mexico; M. W. Williams, 

 6-7 Apr., 1937. 



Comparisons: This is a tiny but gay little scallop which differs 

 strongly from the associated C. velero Hertlein in the width and flatness 

 of the ribs, as well as in the lack of cross-lamellation on the disk, and the 

 lively coloring. 



Remarks: Dr. Berry kindly presented the author with a specimen of 

 this species, a paratype measuring 5 mm in height and 5.5 mm in length. 

 That it differs from C. velero is quite apparent, but whether those 

 differences entitle it to specific or subspecific rank seems debatable. C. 

 velero biolleyi Hertlein appears to differ from C. velero in more respects 

 than this species. However, until more material is available and a series 

 of specimens can be studied, no taxonomic change is advisable. 



