m 



PLATE L. 



QUATERNARY PECTENS. 



[Unless otherwise stated nil tignres uri' miiiruximately iiiitiinil size.] 



Page. 



Fid. 1. Pirtrti (I'lii:/ii"-t,'iiiiiiii) rirciilarin Siiwcrliy var. :iijiiisi:li-aliix CariifiilcT. [1. S. N. M. 



172708 132 



Exterior of right valve; altitude S2 mm. Reeent, San Pedro, Los Angeles County, 



Cal. (Photographed without coating to show eoloratiim. ) (M. B. ) 



Kii;. \ii. Same specimen as fig. 1 - - 1^2 



Exterior of left valve. (Photographed without coating.) ("M. Ji.) 



Fiii. 1/y. Same specimen as tig. 1 1 



Profile of both valves as vievped from the rear. (M. P.) 



Fui. 2. Pedrn {.Equipecten) palmeri TlaW. U. S. N. I\I. I'lOllSO. Cotype 1 



Exterior of right valve (young); altitude 2t) mm. Recent, head of (julf of California. 



(M. P.) 



Fid. 2o. Same specimen as fig. 2 - - ^'^^ 



Profile of right valve, aw viewed from the rear. (M. P.) 



Fig. 3. rnkn (.Kqiiiprrten ) palnur! Dall. U. S. N. M. 1509«0. Type 136 



Exterior of left valve; altitude 4S mm. Same locality as fig. 2. (M. P.) 



Fig. 3a. Same specimen as fig. 3 - - I'"''' 



Pnilile of left valve as viewed from the rear. (M. P.) 



Fig. 4. I'lxtrn {J'i<rudamusitim) dtiiifhoiii DaW. H. S. N. M. 107747. Type 138 



Copied from Doctor McConnell's drawing of the right valve of the type; altitude 14.7 



mm. (Proc. TT. S. Nat. Mus., vol. 24, pi. 40, fig. li. ) Recent, Davidson Banks, 



north of Unalaska, 351 fathoms (U. S. Fish Com. Stati.m 3330). 



Fig. 4f(. Same si)ecimen as fig. 4 138 



Copied from drawing of left valve. (Idem, pi. 411, fig. 5.) 



244 



