- 218 - 



diagnosis an'?, it is luif ortimate that later \7orkers have accepted 



Gabb's determination. There is no warrant for assigning the thet- 

 idis Sowerby tc this common Pecten, as Dall has done, since Santo 

 Domingiai^ spe^i";ens are knovrn that agree v;ith Sov^^erby's descrip- 

 tion and probably with one of the valves under that n^i^ie in the 

 neniker collection at the British I'useum (1), Gi^pp^^'s earl" con- 



(1). Information from I'r. Held, discucsea by Dall, loc. cit., 

 pp.. 714-715, 1898. In addition to this valve there are 

 others which certainly are distinct. 



fusion of a "Jamaican" Pecten with the recent e^rasneratus . an error 

 which he later corrected and followed Oabb s example in calling it 

 oxyg-onus . indicated that he had the present form in mind. In this 

 connection it is surprising that Dall iised thetidis in a manner 



"which would agree v/ith usage as seen in the Guppy and other collect- 

 ions ". (n) Apparently GuTipy had this common scabrous form labell- 



(2), Dall, 'Jy. E., loc. cit., p. 715, 1898. ^Srt'^ "^' v.^S^"^ 



ed " theti^.is " when his collection was accuirel by the national llus- 

 eum. 



The Santo Domingian specimens of sumpleus reach a slip'htly 

 larger size than the Bowden ones, 7:ith the scales arranged more 



