250 A. S. PACKARD, Jr., ON THE GLACIAL PHENOMENA 



Fusus (Ncptunca) 10-costatus Say. A specimen lias been received from Mr. Fuller. 



Fusus [Ncptunca,) iornaius Gould. Frequent. 



Spirorbis nautiloides Lamk. 



Balanus porcatus Da Costa. (B. gcniculalus Gould.) Frequent. 



Eiipagurus Bernhardus Stimps. Specimens of claws were received from Mr. Fuller. 



Eyas aranea Leach. Fine large specimens have been received from Mr. Fuller and 

 Rev. E. C. Bolles. 



Cancer borealis Stimps. Numerous specimens from Westbrook, with the preceding, from 

 Mr. Fuller. 



The beds at Saco are brickyard clays on the bank of the Saco River, about ten 

 miles from its mouth, and agree very closely with the same beds at Gardiner, and 

 are doubtless on the same horizon as the beds at Westbrook, occurring about the same dis- 

 tance above the sea. Mr. Fuller has very thoroughly explored these beds, and the numer- 

 ous specimens of fossils received from him agree precisely with those from Gardiner. The 

 Nuciilu antiqua and Naticce have been flattened out by pressure as in the Gardiner specimens. 



Idmonca atlantica (I. pruinosa Stimps.) Rare. 



Modiolaria discrepans Moll. Frequent and very large. 



Nucida antiqua Mighl. Abundant. 



Yoldia myalis Couth. 



Yoldia pygmcea Miinster. (Y. lenticula Moll.) 



Leda temdsidcata Couth. Not common. 



Lcda (Yoldia) arctica (Gray.) Parry, Voyage, 1824, p. 241. (Leda iruncata Brown ; L.port- 

 landica Hitchc. Sars, Fossile Dyreleveninger fra Quartaerperioden, 18G5. Nucida siliqua 

 and sidcifcra Reeve. Belcher's "Last of the Arctic Voyagers," vol. ii., pi. 33, figs. 1, 2, 3, p. 

 186.) Very abundant. Found, according to Torell, at Spitzbergen, in from five to thirty 

 fathoms. 



Astarte Banlcsii Leach. 



Thracia Conradi Couth. Broken and flattened specimens are not uncommonly found. 



Thracia truncata Mighels et Adams. Usually the specimens are somewhat broken and 

 distorted. 



Pandora t> ilineata Say. Very common. 



Pandorina arenosa Moll. Not frequent. 



Bulla occulta Mighels. (B. scalpta Reeve. Belcher's " Last of the Arctic Voyagers," ii. 

 app. p. 392, xxxii. 3, a, b, c.) Also occurred at Scarboro and Westbrook frequently. 



Menestho albula Moll. Fine large specimens. 



Nalica affinis Gould. ( N clausa Sowb.) Of large size, as at Gardiner. 



There are similar beds at Kennebnnk, and also at South Berwick, where the bones of a 

 seal have been found, as mentioned by Dr. C. T. Jackson in his Geology of New Hampshire. 



In similar beds at the slide of the Presumpscot in Westbrook and also in Scarboro, a 

 Macoma [Plate vii., figs. 2, 2a.] which is closely allied to, if not identical with, Macoma fusca, 

 occurred quite frequently ; it was collected by Messrs. Fuller and Morse. It is more 

 ventricose, but otherwise of the same proportions. From 31. gronlandica it is readily dis- 

 tinguished by being larger, much more ventricose, much more produced anteriorly, while 

 the posterior end is more rounded and produced, wanting the truncate appearance of M. 

 gronlandica. The ligamental notch is less distinctly marked. 



Length, 1.08 ; breadth, .32 ; height, .70 inch. 



