1913.] NATURAL SCIENCES OF PHILADELPHIA. 603 



not at all resemble this Antigua species. But while Dall's figure of 

 Spencer's Antigua specimen is not exactly like this species, his de- 

 scription agrees so well with the Willoughby Bay specimens that I do 

 not doubt this species is P. gabbi Dall. 

 Pecten (Amusium) antiguensis n. sp. Plate XVIII, figs. 1, 2, 3, 5. 



This large Amusium is very common in the Antigua limestone 

 on the sea beach at Wetherill's Bay and especially at Hodge's Bay. 

 Its description will be found under "Descriptions of New Species." 

 While plentiful at Hodge's Bay, the specimens were so firmly attached 

 to the rock or imbedded in it as to make it almost an impossibility 

 to extract entire, unbroken specimens. This species and the P. 

 anguillensis Guppy were especially likely to be found silicified. 

 This silicification has sometimes obliterated the secondary sculpture, 

 but in other cases has preserved it in most remarkably perfect con- 

 dition, as in some of these specimens. If it were not for this silici- 

 fication, it would be very difficult to obtain any specimens from this 

 hard, white limestone; but this alteration, in part or wholly, to silica 

 makes the specimens weather out in almost complete and perfect 

 condition. 



Pecten nugenti n. sp. Plate XIX, figs. 2, 5, 6. 



Hodge's Bay. 



Ostrea antiguensis n. sp. Plate XIX, fig. 7; plate XX, figs. 1, 5, 6. 



In some of the exposures of this limestone along the seashore, 

 notably at Hodge's Bay and at Wetherill's Bay, the hard limestone 

 contained many isolated oyster shells. Of these, the specimens 

 collected at Hodge's Bay I at first referred to Ostrea gatunensis B. and 

 P., but upon further examination I find that they are the same as 

 those collected at High Point and Wetherill's Bay. These are 

 specimens of a new species to which I have given the name of Ostrea 

 antiguensis. At Willoughby Bay a much larger species of oyster 

 was observed, perhaps 0. haitensis Sowb., but specimens could not 

 be obtained, as they were imbedded in the hard, compact limestone. 



Spondylus sp. indet. 



A single young specimen of a Spondylus was collected at High 

 Point. It seems to resemble Spondylus bostrichites Guppy, but is 

 too young and too fragmentary to be determined with certainty. 

 This shell was silicified also. 

 Turritella forresti n. sp. Plate XX, figs. 2-4, 7. 8. 



Found at Willoughby Bay by Mr. W. R. Forrest. See "Descrip- 

 tions of New Species." 



